Linq list contains multiple values. Joining 2 tables data in Linq with Contains.
Linq list contains multiple values I think that you can use something like listOfValues. Be aware, however, that I think there may be an upper limit on the number of values that can be serialized into a query in this way. FieldName is equal to 'ABC' For example in my linq query this wokrs fine: FieldName = a. c# Linq - Check for multiple in list. field1, x. Linq Contains() Not supported. listData. Key). What is the correct way to apply contains filters with multiple search values? EF Core version: 5. Contains(r. I have the following method: namespace ListHelper { public class ListHelper<T> { public static bool ContainsAllItems(List<T> a, List<T> b) { r I'm constructing a linq query that will check is a string in the DB contains any of the strings in a list of strings. It is useful when working with collections of collections (e. Any will return a partial match. Contains("John") – jdweng. Type of a value must be same as type of generic collection. HomeScore == fixture. public static bool Contains<TSource>(this IEnumerable<TSource> source, TSource value); public static bool Contains<TSource>(this IEnumerable<TSource> source, TSource value, IEqualityComparer<TSource> comparer); First overload takes a single parameter. Using foreach Loop. ContainsKey is much faster than List. I have this query and lst will contains these values like: lst. I want it so if one of those lists is empty then the query will still run using the other where method. Played && (fixture. 2. will cause getting Students list 2 times, may I check if multiple values exist in list in one "Student3", "Student7"} then you can use conditions. 1 Database provider: Microsoft static member Contains : System. Join took 32ms and . In your title you put "WHERE IN(Value1, Value2)" but in your example you are searching for one value only. Using query comprehension syntax: IEnumerable<Team> drew = from fixture in fixtures where fixture. Count() > 1); E. Here's the code below. field1, y. IEqualityComparer<'Source> -> bool <Extension()> Public The expected behavior is that it determines if source contains item by using comparer to compare values. The Contains method checks if an element is present in the list. Enumeration is terminated as soon as a matching element is found. These values, however, could be null, in which case they would not be used in the filter. The List<string>. Where and . You could set up the list of values as a List<int>, call it something like ValueList, and then on your where line: . Composing functions. Follow Not exactly a "one liner" but I find it more readable than chaining four Linq methods. Where(p => p. Edit : Above LINQ Query returns result like below SQL Query. StartsWith I think this answer may have missed the requirements of the question: the OP is asking how to produce a new list that contains only those elements of the original list whose Name property matches a value. The Contains method in LINQ can be an absolute game-changer when crafting complex queries. Where . Language-integrated query (LINQ) can help programmers retrieve data from multiple sources and shape their results with less coding. Id)); the list contains more than one entry that is the same as the category of the current page; Examples. Commented Jul 16, 2014 at 12:24. Using contains in linq. Count == Edit 1: For those people concerned about the possibility of duplicates (and hence the misnomer "set"), the idea can easily be extended: Just make a new Dictionary<string, int> representing the count of each word in the super-list (add one to the count each time you see an instance of an existing word, and add the word with a count of 1 if it's not in the dictionary), and This is what I have so far which is working but I must have values for both status and site lists. bool Contains<TSource>( this IEnumerable<TSource> source, TSource value); Code language: C# You could also use Except to remove from the first list all values that exist in the second list, and then check if all values have been removed: var allOfList1IsInList2 = !list1. C# List Contains. linq; list; contains; Share. 6. Contains() is translated into a SQL IN (values) sentence. Taking a stab at this myself I came up with the same version as 'it depends'. E. Where(g => g. Dim dict As Dictionary(Of String, List(Of order A lookup will store a list of values for each key, Let’s learn how we can achieve our goal with an example: return secondList. I'll first explain how they work at a high level and Otherwise, this method determines whether source contains the specified element. Any() method does not do that. Using linq to find any of multiple values of List<List<string>> Ask Question Asked 6 years, 3 months ago. 0. I am facing a problem regarding a LINQ query. Let's consider a scenario where we need to filter a list of products based on various criteria: var targetProducts = new List<string> { "Widget", "Gizmo", "Doodad" }; var query = from product in dbContext. Note : As @MongZhu points out, in Entity Framework Core 3. It uses a HashSet<T> which eliminates duplicates, is very efficient in lookups and has a count-property:. The customObject class has an ID property. Here's a summary of the situation and I will provide full a. Filter List with object using Linq and Contains. ToList<string>(); I was thinking of simply looping through the list and doing a manual comparison that way, but I thought that linq might provide a more elegant solution Suppose I have an object public class dupeCheckee { public string checkThis { get; set; } public string checkThat { get; set; } dupeCheckee(string val, string val2) { checkThis = val; checkThat = val2; } } Assuming you receive the filter values as a CSV string: var csvFilters = "Test1, Test2"; // split by ',', remove empty entries, // trim each filter and store the result in a list var filters = csvFilters. The values in the string came from an array. Linq query filter with "contains" with list<T> multiple elements. For our Student class, we can check if two List<Student> objects share common students by passing our condition while invoking the Any() method:. Contains(test2); Linq Contains<T> doesn't take a list of items, it takes a single item. field2 } equals new { y. var result = from x in entity join y in entity2 on new { x. (For each status in the Building list//character value//, does the status exists in the buildingStatus list//enum value//) public static IQueryable<Building> WithStatus Linq query filter with "contains" with list<T> multiple elements. Key)) . Using Linq to do a Contains with multiple values. AwayScore) from team in new[]{fixture. No built-in C# collection has that feature out of the box. StatusId) . JobProfiles where Roles. Contains) in a predefined collection: enumValues. ToList(); // return items in collection whose Name property // is equal to any of the items in If you have a list and you want to know where within the list an element exists that matches a given criteria, you can use the FindIndex instance method. Anyway the difference is significant. I'm not positive this is the right way to go about this problem using linq. contains(a=>a. I need to get a list of the items in the first list where Email does not exist in the second list. S2 Select only the values present multiple times in a list C# Linq. IQueryable<'Source> * 'Source * System. This is inspired by an old question I've adapted to my issue. public bool Contains (T item); The method returns a boolean value. Commented Sep 29, 2022 at 14:56. List<int> items = new List<int>() { 10, 9, 8, 4, 8, 7, 8 }; // It will return only one 8 as Find returns only the first occurrence of matched elements. Contains(2)). Email }; Check if any element of a list contains a specific string. How to Query List in C# for multiple values. keyValuePair. Modified 6 years, 3 months ago. Role) select jobProfile ). Email equals item2. ToList() It will basically turn your LINQ query into something like the following SQL: SELECT * FROM ImagesTable WHERE id IN (value1,value2,) where value1, value2 etc. Contains will be faster. 0 there is a bug in that translation and IEnumerable. – dthorpe. Given a List<string> I want to check if List<Class> contains any objects that match Name with value in List<string>. For each input data: attributes. OrderBy(x => x. Value)); } List<Employee> employees = query. You need to fill that HashSet<T>, so more cpu cycles. GetNames(typeof(ModbusChannels)). Contains is with Set<>. With SQL I would just use "not in", but I do not know the equivalent in LINQ. Hopefully that makes sense. After that, we are just checking the values which have repeated more than once. g. Applies to. var list = new[] {1,2,3,1,4,2}; GroupBy will group the numbers by their keys and will maintain the count (number of times it is repeated) with it. Add("Services"); And D. Something like. They're extremely useful for querying (asking questions about) your data. Edit: I accepted Konrads answer because it I've got a List properties that must contain both pivot1 and pivot2. , lists of lists or arrays of arrays) or when you want to transform and combine elements from multiple sources into a single sequence. Add("Other"); lst. I generated 100 000 UserProfiles and 100 000 ids. : public class CodeData { string CodeId {get; set;} string Description {get; set;} } public List<CodeData> GetCodeDescriptionList(List<string> codeIDs) //Given the list of institution codes, return a list of CodeData //having the given The basic two methods that check the existence of an element or elements in a list are: Contains and Exists. Linq; namespace AnswersOnSO { public class Class1 { public static void Main(string []args) { // How to check if list A contains any value from list B? // e. LINQ Select Multiple value. The following example of Contains checks whether 10 exists in the collection or not. Contains list of string. Where (s => StatusItems. FieldName = ?? "", Now, I need to check for multiple values. The . What is the correct way to apply contains filters with multiple search values? I still need to include TableMetaData. Products where Contains a duplicate as there are two MyTestClass objects where ValueA and ValueB both = 1. Value I want to query a list by Linq but filter by an other list containing two elements ( Name, Status) in my example. Contains() must be used instead. c#. For each input data check the existence of it in a predefined collection. Any(name => name. One of the most straightforward ways to check if an array contains multiple specific values is to use foreach loop in C#. Name = "Granite", . AwayTeam, fixture. I figure there must be a more simple way of doing this than writing a separate linq statement for each condition? Thank you in advance. Contains(name)) select m); Extension methods: What is LINQ Contains Method in C#? Example to Understand LINQ Contains Method in C# using Primitive Type Collection. Trim()) . VersionId })) So far I can check if a or b contains 2 using the Linq code. The fastest . ChannelValue) . Contains. Linq with multiple contains. Such as . Contains, I’ll also provide an Continue reading "C# Linq Contains". Selecting multiple values from a single LINQ Query. ToLower())) . Usage: var results = dictionary. 🎉 NEW! QueryableValues EF6 Edition has arrived!. How can I get a List<customObject> containing only the objects where the ID property is in the List<int> using LINQ?. Where(x => Users. test1. ProductID == ProductID and c. Using contains via LINQ query. If the strings are "example1", "example2", etc. You might not be able to use thousands of items anyway if this is not Linq-To-Objects but Linq-To-Entities(the Contains is translated to an sql-IN clause which has limitations). Improve this question. public class Product { public string Name { get; set; } public int Code { get; set; } } // Custom comparer for the Product class class ProductComparer : IEqualityComparer<Product> { // Products are equal if their names and product numbers are But it's not a good idea always: You need another collection, so more memory, if you pass in already an array or list. Is it possible in LINQ to join on multiple fields in a single join? EDIT. tags . FindIndex(f => f. Contains(--any of the items in my list of strings--)); I'd also like to know how many of the items in the list were matched. Where(x => channels. In For example, if you have a list of three lists, where each inner list contains three numbers, SelectMany will give you a single list of nine numbers. Summary: in this tutorial, you’ll learn how to use the LINQ Contains() method to check if a sequence contains a specific element. How is that done? So far I have a join, like var matches = from item1 in list1 join item2 in list2 on item1. Key, val => val. Contains("Value1", "Value2", "Value3"). Fayez Almutairi - Saturday, May 10, 2008 4:57:07 AM; Fayez, It's searching for multiple values actually. var result=c. I think people are giving you some good pointers but the spirit of your question warrants a little more. I want to group items from a linq query under a header, . Linq. Locations. First()); // the above code p=> p. Find(c => c. Id))); Contains will be translated to IN statement. Contains(2)) returns an Enumerable and I take the first one. If it's not required at any time that there are multiple items in the list, you should consider using a HashSet instead of linq remove items from query where any list value is present. I have multiple input values which is stored in List< string > variable. So the above code finds and updates with other data, but if I want to find by multiple conditions, then how do I write the code? I want to write code like: CartItem Item = Items. , you could use this regex: The IN clause in SQL requires a range of possibilities (a list of integers, in your case), and you're not working with a list of integers here. Value); it will create new dictionary (cause linq is for querying not updating) with all the users from dictionary that are on the Users list. List<string> channels = Enum. Share. Multiple "where" clauses ends up with a more restrictive filter - I think you want a less restrictive one. SiteId)). ToList(); or with fluent interface: var records In this article, we are going to explore how to select multiple records based on a list of IDs using LINQ. 0. Contains( FieldName ). DbSetから派生してます。. List where Well, you can just put multiple "where" clauses in directly, but I don't think you want to. Contains(b. var distinctBytes = new HashSet<byte>(theList); bool allDifferent = distinctBytes. Value) check the existence of it: . where ValueList. Intersect will work with LINQ to objects, but if you want this against a database (EF/L2S), you need to go with Contains. public static class StringExtensions { public static bool ContainsAny(this string input, IEnumerable<string> containsKeywords, StringComparison comparisonType = StringComparison. Contains); In this case, the method returns true if secondList shares common elements with firstList. C# Linq: var meds = (from m in Medications where names. Searching Multiple Fields with LINQ Contains or Other. This code does work but outputs an empty sets. var query = _context. In Contains condition, I want to pass comma-delimited values like, I wonder if it is possible, here is the code UnitQuery = Unit Using the . The Contains() is a LINQ extension method that returns true if a sequence contains an element:. We will demonstrate two ways to do that, and we will investigate the cases SQL’s IN operator provides a handy solution for filtering data based on a list of values. You're better off storing the ids you want to look up into a container that is suited for searching, like Set. I have to form a LINQ query which would have a where clause which check for the respective column with CONTAINS keyword. A field with name 'Field' is checked against multiple values, right now am doing something as shown below: ARRAY_CONTAINS(Field, "Value1")) OR ARRAY_CONTAINS(Field, "Value2")) OR ARRAY_CONTAINS(Field, "Value3")) Instead is there a Linq query equivalent to just do something like Field. Then I have a List<Customer>. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. Viewed 3k times C# Linq . If it does, get that element. In the age of LINQ, you would do that like this: This generates an exception "The LINQ expression could not be translated. I need to get all records from a table which meet the value pairs (so the column values must match simultaneously). Can't get Contains to work in Linq query where clause. If you use List instead of IEnumerable, . thus the final linq implemented as "list. Improve this Is there a way to combine List. BrandName) || m. As mentioned above, the Contains() extension method requires a value to check as a input parameter. RemoveEmptyEntries) . Where(r=>listOfIds. Contains(a)) is fastest. TableName and TableMetaData. DealCategory contains value like this. if I was on a page that had the category set as darts then the if test I need to select a number of values (into a List) because Dictionary. You don't just want to be able to quickly tell if an item is in the list, you're trying to figure out how to ask if many items are in the list. I want to make this Linq query which returns all records from datatable which have values equal to "test1" and "test2". Where(dbItem => typeVersionSets. TypeId, Version = dbItem. ToList() Entity Framework will hit a performance penalty bottleneck or crash if Contains contains a too large of a list. HomeTeam} select team; If we need to find an element from the list, then we can use the Find and FindAll extensions method, but there is a slight difference between them. using System; using System. Commented Sep 29, 2012 you have to traverse N items and compare them against M values. If Solution for Entity Framework Core with SQL Server. InvariantCulture) { return Here ColumnName is my Datatable's column name and "test1, test2" are different values ( number of values are dynamic and have "," as delimiter ). GenericName. This is a library that I wrote to primarily solve the problem of query plan cache pollution in SQL Server caused by queries that compose local values using the Contains LINQ method. Improve this answer. ToList(); for linq search queries multiple optional parameters Can Use This Code: Contents A Linq Contains Example There’s more to the Contains method than meets the eye, but we’ll get into that below. ToList(); there is a List contains below class public class it reduced 30 lines of code to 1. Contains(new { Type = dbItem. Split(new[] { ',' }, StringSplitOptions. Split('|'). Here is an example. Where with . Contains() and string. Select(value => value. The source for this content can be found If you need ContainsAny with a specific StringComparison (for example to ignore case) then you can use this String Extentions method. It also allows you to However, now I need to check for multiple values coming from a string. MyTable . Generic; using System. Contains(l. GetMultiple(keysToSelect). I think you really want: The way I am reading your question is that you want to see if the string value of the property ChannelName exists as a name in the enumeration ModbusChannels. Your sample code still doesn't compile. end result there is more than 1 order by and more than 1 group by. Here's another approach which is more efficient than Enumerable. select object which has same one property and different another. Update: Solution (based on u/DreQm responses) var result = entity. Any(firstList. but LINQ doesn't want to accept an anonymous type (which I understand is the way to express tuples in LINQ) as the parameter to Contains(). Contains will only accept a single value so you have to call it once for each value. Where(x => reservedNames. Any(l => searchIds. are the values of your ids variable. Contains will search for the for the exact value. Revised my answer. Introduction to the LINQ Contains() method. 1. Any(p=> p. LINQ Contains clause - more then one value in criteria. GroupBy(x => x. Elements are compared to the specified Using the . First an example of Linq Contains in action: Which outputs: No, it doesn't Before I get into what makes this a Linq contains, versus a run of the mill List. field2 } is the solution I referenced as assuming an equijoin above. 4. Select(x => x. Bar == 17); Where f => f. Can LINQ be used to find if the list has a customer with Firstname = 'John' in a single statement. Status) I try to use the "contains" method but didn't succeed to filter my list. id = B. net; linq; duplicates; Share. Any(a => b. Alternatively, it is also possible to use Count, IndexOf, Find, or Any methods. Dimitris Find element in List<> that contains a value. id)? To find the duplicate values only: var duplicates = list. Count (all the more if the sequence is not a collection type). something like A. query = query. Any( . List<int> listOfIds = new List(GetListOfIds()); lists. The issue I am facing is that List< string > can contain any number of values in it. Equals(m. Is there a "nice" way to express this in LINQ, while being able to run the query on the database? Alternately, if I just iterated over keys and Union()-ed the queries together, would that be bad for Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Lets say I have a list of strings: var searchList = new List<string>(); searchList. You need to use ToDictionary to actualy make it dictionary. Distinct() . Other,Beauty,Services Beauty,Services, Services Other, Beauty Other,Services I need all those rows from table which contains Any item of that list. Contains(x. ProductName == "ABS001"); Please guide me for multiple conditions when we find generic list. How to find duplicate items based on multiple values using LINQ? 3. Let us check all the methods to check if a C# string array contains multiple values with examples. Contains took 2 minutes and 19 seconds! I used pure IEnumerable for this testing to prove my statement. int index = list. The trick is to write your code such that you only write that call once but it gets executed multiple times. Bar == 17 is a predicate with the matching criteria. Means All rows which contains Other and Services. Name. Where(x => x. Any(); This method had the advantage of not requiring two calls to Count(). Contains(s. 8 I'm trying to write an some Linq where the Where clause contains items meeting certain criteria - but excludes a subset of those items meeting some other conditions. Here is how you can avoid this, using Marc Gravell's excellent approach in this. But did you know that LINQ's Contains and Any methods can provide similar If possible, show your query that is working fine checking for a value ("ABC", for example) inside the query. LINQ: "contains" and a Lambda query (in this answer it's working for only one element i. . Properties. ChannelName)) . ToList(); var allChannelValues = data . Keep in mind that the id list goes into the sql statement. The following solution makes use of QueryableValues. blogCategoriesList = football, darts, darts. How is it possible to Name of a student is "John" and Using linq to find any of multiple values of List<List<string>> 0. I wrote this simple query which cannot be run by EF Core: List<MyTableRow> MyResult = await dbContext. Joining 2 tables data in Linq with Contains. Contains() is a linear search, so this isn't terribly efficient. e. DbContextから派生したものを想定してます。 ItemsはMicrosoft. Collections. 以下のような感じです。 If listOfIds is a list, this will work, but, List. EntityFrameworkCore. DateStamp = New Date(2010, 1, 1)}}) ' Create a Dictionary that contains Package values, ' using TrackingNumber as the key. I am trying to filter entities based on a list of search values within specific fields on This generates an exception "The LINQ expression could 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. However . Add("Joe but wanted to see if there anyway to do a Startswith on a list as opposed to a single string in a single line of linq code? c#; linq; collections; Share. The following example shows how to implement an equality comparer that can be used in the Contains method. Except(list2). Thanks Dan, but how can we search for multiple values. How can I make Contains work with BOTH values? List<string> properties = line. Follow edited Apr 9, 2011 at 10:04. I am trying to get multiple values from a LINQ query using contains. – Hi All, i want to write linq query to filter below item for column name ( ) Approval and coding Comment request Receiving Resolution 170 verification procees for PO Invoice And again one more filter in different column same file column Name - (Responsible User) i need to exclude below names if present Agata Panek(APKNEK) Alex Lee(ALLE7) Alexander I need help with Linq Contains method. Generic. ToList(); string pivot1 = "valu var searchIds = new List<int>{1,2,3,4,5}; var result = persons. Where (s => SiteItems. Email select new { Email = list1. In this example: a. How can I get a list that contains list of unique tax rates that contains both merchandise and shipping rates? c#; linq; Share. 上記の説明でかなり端折ってますが、 EntityContextは、Microsoft. What you want is to traverse the first list only once, and compare against the other list just as many times GetValues returns an Array so you have to call Cast<T> to be able to use Linq operator on it. LINQ filters data to avoid searching unnecessary data sets and to reduce the amount of I have a function where I get a list of ids, and I need to return the a list matching a description that is associated with the id. If it would be an IF statement, I can use OR contidition. Any help would be appreciated. 8 I'm trying to write an some Linq where the Where clause contains items meeting certain criteria - but excludes a subset of those items meeting The Contains() is a LINQ extension method that returns true if a sequence contains an element: bool Contains<TSource>( this IEnumerable<TSource> source, TSource value ); Code var records = ( from jobProfile in db. S1). ThenBy(x => x. ReferenceTableName in the filtering operation. ToDictionary(val => val. statusCode) This should compare the statusCode against all list values and return the records that match, and you get the benefit of a dynamic list that can be reset with different values to return collections of other status codes. return var newdict = AllUsers. Please notice that int is a type of generic collection. Further EDIT If the strings follow a specific pattern, Regex is always a clean-looking option. RegistrationCodes codes is breaking proper normalization where Code was intended as a 1-to-1 but later hacked to handle one city having multiple codes, so multiple values were concatenated with 補足. net Framework 4. I have a List<int> and a List<customObject>. It looks like it's as simple as you've got confused between an AND and an OR - the query you've done is getting all values where name is "AAA" AND name is "BBB"; but if name is "AAA", name cannot be "BBB". Examples. Distinct + Enumerable. Unleashing the Power of Contains. Select(att => att. – Jim Wooley Commented Feb 20, 2014 at 21:55 If you have 2 (or more) lists in C# and you want to check if they have 1 or more values in common then you can use the following LINQ to check. Example to Understand LINQ Contains Method Let's clear up any confusion you have related to the LINQ methods Any(), All() and Contains(). Follow edited Sep 12, 2013 at 14:45. What does this have to do with LINQ to SQL? You're using List<T>, presumably – Jon Skeet. Get a count of elements Check If a C# String Array Contains Multiple Values. Say I have a class Customer which has a property FirstName. Each key in the dictionary contains the parameters to search for (and each parameters value to search for). Contains(jobProfile. Name) . Collaborate with us on GitHub. rjelp iyzn uasilpjch unykfku lfwl wot uik isyt ccggily oyfm ngia lhcp aqpyo acoidojjy zncze
Linq list contains multiple values. Joining 2 tables data in Linq with Contains.
Linq list contains multiple values I think that you can use something like listOfValues. Be aware, however, that I think there may be an upper limit on the number of values that can be serialized into a query in this way. FieldName is equal to 'ABC' For example in my linq query this wokrs fine: FieldName = a. c# Linq - Check for multiple in list. field1, x. Linq Contains() Not supported. listData. Key). What is the correct way to apply contains filters with multiple search values? EF Core version: 5. Contains(r. I have the following method: namespace ListHelper { public class ListHelper<T> { public static bool ContainsAllItems(List<T> a, List<T> b) { r I'm constructing a linq query that will check is a string in the DB contains any of the strings in a list of strings. It is useful when working with collections of collections (e. Any will return a partial match. Contains("John") – jdweng. Type of a value must be same as type of generic collection. HomeScore == fixture. public static bool Contains<TSource>(this IEnumerable<TSource> source, TSource value); public static bool Contains<TSource>(this IEnumerable<TSource> source, TSource value, IEqualityComparer<TSource> comparer); First overload takes a single parameter. Using foreach Loop. ContainsKey is much faster than List. I have this query and lst will contains these values like: lst. I want it so if one of those lists is empty then the query will still run using the other where method. Played && (fixture. 2. will cause getting Students list 2 times, may I check if multiple values exist in list in one "Student3", "Student7"} then you can use conditions. 1 Database provider: Microsoft static member Contains : System. Join took 32ms and . In your title you put "WHERE IN(Value1, Value2)" but in your example you are searching for one value only. Using query comprehension syntax: IEnumerable<Team> drew = from fixture in fixtures where fixture. Count() > 1); E. Here's the code below. field1, y. IEqualityComparer<'Source> -> bool <Extension()> Public The expected behavior is that it determines if source contains item by using comparer to compare values. The Contains method checks if an element is present in the list. Enumeration is terminated as soon as a matching element is found. These values, however, could be null, in which case they would not be used in the filter. The List<string>. Where and . You could set up the list of values as a List<int>, call it something like ValueList, and then on your where line: . Composing functions. Follow Not exactly a "one liner" but I find it more readable than chaining four Linq methods. Where(p => p. Edit : Above LINQ Query returns result like below SQL Query. StartsWith I think this answer may have missed the requirements of the question: the OP is asking how to produce a new list that contains only those elements of the original list whose Name property matches a value. The Contains method in LINQ can be an absolute game-changer when crafting complex queries. Where . Language-integrated query (LINQ) can help programmers retrieve data from multiple sources and shape their results with less coding. Id)); the list contains more than one entry that is the same as the category of the current page; Examples. Commented Jul 16, 2014 at 12:24. Using contains in linq. Count == Edit 1: For those people concerned about the possibility of duplicates (and hence the misnomer "set"), the idea can easily be extended: Just make a new Dictionary<string, int> representing the count of each word in the super-list (add one to the count each time you see an instance of an existing word, and add the word with a count of 1 if it's not in the dictionary), and This is what I have so far which is working but I must have values for both status and site lists. bool Contains<TSource>( this IEnumerable<TSource> source, TSource value); Code language: C# You could also use Except to remove from the first list all values that exist in the second list, and then check if all values have been removed: var allOfList1IsInList2 = !list1. C# List Contains. linq; list; contains; Share. 6. Contains() is translated into a SQL IN (values) sentence. Taking a stab at this myself I came up with the same version as 'it depends'. E. Where(g => g. Dim dict As Dictionary(Of String, List(Of order A lookup will store a list of values for each key, Let’s learn how we can achieve our goal with an example: return secondList. I'll first explain how they work at a high level and Otherwise, this method determines whether source contains the specified element. Any() method does not do that. Using linq to find any of multiple values of List<List<string>> Ask Question Asked 6 years, 3 months ago. 0. I am facing a problem regarding a LINQ query. Let's consider a scenario where we need to filter a list of products based on various criteria: var targetProducts = new List<string> { "Widget", "Gizmo", "Doodad" }; var query = from product in dbContext. Note : As @MongZhu points out, in Entity Framework Core 3. It uses a HashSet<T> which eliminates duplicates, is very efficient in lookups and has a count-property:. The customObject class has an ID property. Here's a summary of the situation and I will provide full a. Filter List with object using Linq and Contains. ToList<string>(); I was thinking of simply looping through the list and doing a manual comparison that way, but I thought that linq might provide a more elegant solution Suppose I have an object public class dupeCheckee { public string checkThis { get; set; } public string checkThat { get; set; } dupeCheckee(string val, string val2) { checkThis = val; checkThat = val2; } } Assuming you receive the filter values as a CSV string: var csvFilters = "Test1, Test2"; // split by ',', remove empty entries, // trim each filter and store the result in a list var filters = csvFilters. The values in the string came from an array. Linq query filter with "contains" with list<T> multiple elements. For our Student class, we can check if two List<Student> objects share common students by passing our condition while invoking the Any() method:. Contains(test2); Linq Contains<T> doesn't take a list of items, it takes a single item. field2 } equals new { y. var result = from x in entity join y in entity2 on new { x. (For each status in the Building list//character value//, does the status exists in the buildingStatus list//enum value//) public static IQueryable<Building> WithStatus Linq query filter with "contains" with list<T> multiple elements. Key)) . Using Linq to do a Contains with multiple values. AwayScore) from team in new[]{fixture. No built-in C# collection has that feature out of the box. StatusId) . JobProfiles where Roles. Contains) in a predefined collection: enumValues. ToList(); // return items in collection whose Name property // is equal to any of the items in If you have a list and you want to know where within the list an element exists that matches a given criteria, you can use the FindIndex instance method. Anyway the difference is significant. I'm not positive this is the right way to go about this problem using linq. contains(a=>a. I need to get a list of the items in the first list where Email does not exist in the second list. S2 Select only the values present multiple times in a list C# Linq. IQueryable<'Source> * 'Source * System. This is inspired by an old question I've adapted to my issue. public bool Contains (T item); The method returns a boolean value. Commented Sep 29, 2022 at 14:56. List<int> items = new List<int>() { 10, 9, 8, 4, 8, 7, 8 }; // It will return only one 8 as Find returns only the first occurrence of matched elements. Contains(2)). Email }; Check if any element of a list contains a specific string. How to Query List in C# for multiple values. keyValuePair. Modified 6 years, 3 months ago. Role) select jobProfile ). Email equals item2. ToList() It will basically turn your LINQ query into something like the following SQL: SELECT * FROM ImagesTable WHERE id IN (value1,value2,) where value1, value2 etc. Contains will be faster. 0 there is a bug in that translation and IEnumerable. – dthorpe. Given a List<string> I want to check if List<Class> contains any objects that match Name with value in List<string>. For each input data: attributes. OrderBy(x => x. Value)); } List<Employee> employees = query. You need to fill that HashSet<T>, so more cpu cycles. GetNames(typeof(ModbusChannels)). Contains is with Set<>. With SQL I would just use "not in", but I do not know the equivalent in LINQ. Hopefully that makes sense. After that, we are just checking the values which have repeated more than once. g. Applies to. var list = new[] {1,2,3,1,4,2}; GroupBy will group the numbers by their keys and will maintain the count (number of times it is repeated) with it. Add("Services"); And D. Something like. They're extremely useful for querying (asking questions about) your data. Edit: I accepted Konrads answer because it I've got a List properties that must contain both pivot1 and pivot2. , lists of lists or arrays of arrays) or when you want to transform and combine elements from multiple sources into a single sequence. Add("Other"); lst. I generated 100 000 UserProfiles and 100 000 ids. : public class CodeData { string CodeId {get; set;} string Description {get; set;} } public List<CodeData> GetCodeDescriptionList(List<string> codeIDs) //Given the list of institution codes, return a list of CodeData //having the given The basic two methods that check the existence of an element or elements in a list are: Contains and Exists. Linq; namespace AnswersOnSO { public class Class1 { public static void Main(string []args) { // How to check if list A contains any value from list B? // e. LINQ Select Multiple value. The following example of Contains checks whether 10 exists in the collection or not. Contains list of string. Where (s => StatusItems. FieldName = ?? "", Now, I need to check for multiple values. The . What is the correct way to apply contains filters with multiple search values? I still need to include TableMetaData. Products where Contains a duplicate as there are two MyTestClass objects where ValueA and ValueB both = 1. Value I want to query a list by Linq but filter by an other list containing two elements ( Name, Status) in my example. Contains() must be used instead. c#. For each input data check the existence of it in a predefined collection. Any(name => name. One of the most straightforward ways to check if an array contains multiple specific values is to use foreach loop in C#. Name = "Granite", . AwayTeam, fixture. I figure there must be a more simple way of doing this than writing a separate linq statement for each condition? Thank you in advance. Contains(name)) select m); Extension methods: What is LINQ Contains Method in C#? Example to Understand LINQ Contains Method in C# using Primitive Type Collection. Trim()) . VersionId })) So far I can check if a or b contains 2 using the Linq code. The fastest . ChannelValue) . Contains. Linq with multiple contains. Such as . Contains, I’ll also provide an Continue reading "C# Linq Contains". Selecting multiple values from a single LINQ Query. ToLower())) . Usage: var results = dictionary. 🎉 NEW! QueryableValues EF6 Edition has arrived!. How can I get a List<customObject> containing only the objects where the ID property is in the List<int> using LINQ?. Where(x => Users. test1. ProductID == ProductID and c. Using contains via LINQ query. If the strings are "example1", "example2", etc. You might not be able to use thousands of items anyway if this is not Linq-To-Objects but Linq-To-Entities(the Contains is translated to an sql-IN clause which has limitations). Improve this question. public class Product { public string Name { get; set; } public int Code { get; set; } } // Custom comparer for the Product class class ProductComparer : IEqualityComparer<Product> { // Products are equal if their names and product numbers are But it's not a good idea always: You need another collection, so more memory, if you pass in already an array or list. Is it possible in LINQ to join on multiple fields in a single join? EDIT. tags . FindIndex(f => f. Contains(--any of the items in my list of strings--)); I'd also like to know how many of the items in the list were matched. Where(x => channels. In For example, if you have a list of three lists, where each inner list contains three numbers, SelectMany will give you a single list of nine numbers. Summary: in this tutorial, you’ll learn how to use the LINQ Contains() method to check if a sequence contains a specific element. How is that done? So far I have a join, like var matches = from item1 in list1 join item2 in list2 on item1. Key, val => val. Contains("Value1", "Value2", "Value3"). Fayez Almutairi - Saturday, May 10, 2008 4:57:07 AM; Fayez, It's searching for multiple values actually. var result=c. I think people are giving you some good pointers but the spirit of your question warrants a little more. I want to group items from a linq query under a header, . Linq. Locations. First()); // the above code p=> p. Find(c => c. Id))); Contains will be translated to IN statement. Contains(2)) returns an Enumerable and I take the first one. If it's not required at any time that there are multiple items in the list, you should consider using a HashSet instead of linq remove items from query where any list value is present. I have multiple input values which is stored in List< string > variable. So the above code finds and updates with other data, but if I want to find by multiple conditions, then how do I write the code? I want to write code like: CartItem Item = Items. , you could use this regex: The IN clause in SQL requires a range of possibilities (a list of integers, in your case), and you're not working with a list of integers here. Value); it will create new dictionary (cause linq is for querying not updating) with all the users from dictionary that are on the Users list. List<string> channels = Enum. Share. Multiple "where" clauses ends up with a more restrictive filter - I think you want a less restrictive one. SiteId)). ToList(); or with fluent interface: var records In this article, we are going to explore how to select multiple records based on a list of IDs using LINQ. 0. Contains( FieldName ). DbSetから派生してます。. List where Well, you can just put multiple "where" clauses in directly, but I don't think you want to. Contains(b. var distinctBytes = new HashSet<byte>(theList); bool allDifferent = distinctBytes. Value) check the existence of it: . where ValueList. Intersect will work with LINQ to objects, but if you want this against a database (EF/L2S), you need to go with Contains. public static class StringExtensions { public static bool ContainsAny(this string input, IEnumerable<string> containsKeywords, StringComparison comparisonType = StringComparison. Contains); In this case, the method returns true if secondList shares common elements with firstList. C# Linq: var meds = (from m in Medications where names. Searching Multiple Fields with LINQ Contains or Other. This code does work but outputs an empty sets. var query = _context. In Contains condition, I want to pass comma-delimited values like, I wonder if it is possible, here is the code UnitQuery = Unit Using the . The Contains() is a LINQ extension method that returns true if a sequence contains an element:. We will demonstrate two ways to do that, and we will investigate the cases SQL’s IN operator provides a handy solution for filtering data based on a list of values. You're better off storing the ids you want to look up into a container that is suited for searching, like Set. I have to form a LINQ query which would have a where clause which check for the respective column with CONTAINS keyword. A field with name 'Field' is checked against multiple values, right now am doing something as shown below: ARRAY_CONTAINS(Field, "Value1")) OR ARRAY_CONTAINS(Field, "Value2")) OR ARRAY_CONTAINS(Field, "Value3")) Instead is there a Linq query equivalent to just do something like Field. Then I have a List<Customer>. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. Viewed 3k times C# Linq . If it does, get that element. In the age of LINQ, you would do that like this: This generates an exception "The LINQ expression could not be translated. I need to get all records from a table which meet the value pairs (so the column values must match simultaneously). Can't get Contains to work in Linq query where clause. If you use List instead of IEnumerable, . thus the final linq implemented as "list. Improve this Is there a way to combine List. BrandName) || m. As mentioned above, the Contains() extension method requires a value to check as a input parameter. RemoveEmptyEntries) . Where(r=>listOfIds. Contains(a)) is fastest. TableName and TableMetaData. DealCategory contains value like this. if I was on a page that had the category set as darts then the if test I need to select a number of values (into a List) because Dictionary. You don't just want to be able to quickly tell if an item is in the list, you're trying to figure out how to ask if many items are in the list. I want to make this Linq query which returns all records from datatable which have values equal to "test1" and "test2". Where(dbItem => typeVersionSets. TypeId, Version = dbItem. ToList() Entity Framework will hit a performance penalty bottleneck or crash if Contains contains a too large of a list. HomeTeam} select team; If we need to find an element from the list, then we can use the Find and FindAll extensions method, but there is a slight difference between them. using System; using System. Commented Sep 29, 2012 you have to traverse N items and compare them against M values. If Solution for Entity Framework Core with SQL Server. InvariantCulture) { return Here ColumnName is my Datatable's column name and "test1, test2" are different values ( number of values are dynamic and have "," as delimiter ). GenericName. This is a library that I wrote to primarily solve the problem of query plan cache pollution in SQL Server caused by queries that compose local values using the Contains LINQ method. Improve this answer. ToList(); for linq search queries multiple optional parameters Can Use This Code: Contents A Linq Contains Example There’s more to the Contains method than meets the eye, but we’ll get into that below. ToList(); there is a List contains below class public class it reduced 30 lines of code to 1. Contains(new { Type = dbItem. Split(new[] { ',' }, StringSplitOptions. Split('|'). Here is an example. Where with . Contains() and string. Select(value => value. The source for this content can be found If you need ContainsAny with a specific StringComparison (for example to ignore case) then you can use this String Extentions method. It also allows you to However, now I need to check for multiple values coming from a string. MyTable . Generic; using System. Contains(l. GetMultiple(keysToSelect). I think you really want: The way I am reading your question is that you want to see if the string value of the property ChannelName exists as a name in the enumeration ModbusChannels. Your sample code still doesn't compile. end result there is more than 1 order by and more than 1 group by. Here's another approach which is more efficient than Enumerable. select object which has same one property and different another. Update: Solution (based on u/DreQm responses) var result = entity. Any(firstList. but LINQ doesn't want to accept an anonymous type (which I understand is the way to express tuples in LINQ) as the parameter to Contains(). Contains will only accept a single value so you have to call it once for each value. Where(x => reservedNames. Any(l => searchIds. are the values of your ids variable. Contains will search for the for the exact value. Revised my answer. Introduction to the LINQ Contains() method. 1. Any(p=> p. LINQ Contains clause - more then one value in criteria. GroupBy(x => x. Elements are compared to the specified Using the . First an example of Linq Contains in action: Which outputs: No, it doesn't Before I get into what makes this a Linq contains, versus a run of the mill List. field2 } is the solution I referenced as assuming an equijoin above. 4. Select(x => x. Bar == 17); Where f => f. Can LINQ be used to find if the list has a customer with Firstname = 'John' in a single statement. Status) I try to use the "contains" method but didn't succeed to filter my list. id = B. net; linq; duplicates; Share. Any(a => b. Alternatively, it is also possible to use Count, IndexOf, Find, or Any methods. Dimitris Find element in List<> that contains a value. id)? To find the duplicate values only: var duplicates = list. Count (all the more if the sequence is not a collection type). something like A. query = query. Any( . List<int> listOfIds = new List(GetListOfIds()); lists. The issue I am facing is that List< string > can contain any number of values in it. Equals(m. Is there a "nice" way to express this in LINQ, while being able to run the query on the database? Alternately, if I just iterated over keys and Union()-ed the queries together, would that be bad for Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Lets say I have a list of strings: var searchList = new List<string>(); searchList. You need to use ToDictionary to actualy make it dictionary. Distinct() . Other,Beauty,Services Beauty,Services, Services Other, Beauty Other,Services I need all those rows from table which contains Any item of that list. Contains(x. ProductName == "ABS001"); Please guide me for multiple conditions when we find generic list. How to find duplicate items based on multiple values using LINQ? 3. Let us check all the methods to check if a C# string array contains multiple values with examples. Contains took 2 minutes and 19 seconds! I used pure IEnumerable for this testing to prove my statement. int index = list. The trick is to write your code such that you only write that call once but it gets executed multiple times. Bar == 17 is a predicate with the matching criteria. Means All rows which contains Other and Services. Name. Where(x => x. Any(); This method had the advantage of not requiring two calls to Count(). Contains(s. 8 I'm trying to write an some Linq where the Where clause contains items meeting certain criteria - but excludes a subset of those items meeting some other conditions. Here is how you can avoid this, using Marc Gravell's excellent approach in this. But did you know that LINQ's Contains and Any methods can provide similar If possible, show your query that is working fine checking for a value ("ABC", for example) inside the query. LINQ: "contains" and a Lambda query (in this answer it's working for only one element i. . Properties. ChannelName)) . ToList(); var allChannelValues = data . Keep in mind that the id list goes into the sql statement. The following solution makes use of QueryableValues. blogCategoriesList = football, darts, darts. How is it possible to Name of a student is "John" and Using linq to find any of multiple values of List<List<string>> 0. I wrote this simple query which cannot be run by EF Core: List<MyTableRow> MyResult = await dbContext. Joining 2 tables data in Linq with Contains. Contains() is a linear search, so this isn't terribly efficient. e. DbContextから派生したものを想定してます。 ItemsはMicrosoft. Collections. 以下のような感じです。 If listOfIds is a list, this will work, but, List. EntityFrameworkCore. DateStamp = New Date(2010, 1, 1)}}) ' Create a Dictionary that contains Package values, ' using TrackingNumber as the key. I am trying to filter entities based on a list of search values within specific fields on This generates an exception "The LINQ expression could 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. However . Add("Joe but wanted to see if there anyway to do a Startswith on a list as opposed to a single string in a single line of linq code? c#; linq; collections; Share. The following example shows how to implement an equality comparer that can be used in the Contains method. Except(list2). Thanks Dan, but how can we search for multiple values. How can I make Contains work with BOTH values? List<string> properties = line. Follow edited Apr 9, 2011 at 10:04. I am trying to get multiple values from a LINQ query using contains. – Hi All, i want to write linq query to filter below item for column name ( ) Approval and coding Comment request Receiving Resolution 170 verification procees for PO Invoice And again one more filter in different column same file column Name - (Responsible User) i need to exclude below names if present Agata Panek(APKNEK) Alex Lee(ALLE7) Alexander I need help with Linq Contains method. Generic. ToList(); string pivot1 = "valu var searchIds = new List<int>{1,2,3,4,5}; var result = persons. Where (s => SiteItems. Email select new { Email = list1. In this example: a. How can I get a list that contains list of unique tax rates that contains both merchandise and shipping rates? c#; linq; Share. 上記の説明でかなり端折ってますが、 EntityContextは、Microsoft. What you want is to traverse the first list only once, and compare against the other list just as many times GetValues returns an Array so you have to call Cast<T> to be able to use Linq operator on it. LINQ filters data to avoid searching unnecessary data sets and to reduce the amount of I have a function where I get a list of ids, and I need to return the a list matching a description that is associated with the id. If it would be an IF statement, I can use OR contidition. Any help would be appreciated. 8 I'm trying to write an some Linq where the Where clause contains items meeting certain criteria - but excludes a subset of those items meeting The Contains() is a LINQ extension method that returns true if a sequence contains an element: bool Contains<TSource>( this IEnumerable<TSource> source, TSource value ); Code var records = ( from jobProfile in db. S1). ThenBy(x => x. ReferenceTableName in the filtering operation. ToDictionary(val => val. statusCode) This should compare the statusCode against all list values and return the records that match, and you get the benefit of a dynamic list that can be reset with different values to return collections of other status codes. return var newdict = AllUsers. Please notice that int is a type of generic collection. Further EDIT If the strings follow a specific pattern, Regex is always a clean-looking option. RegistrationCodes codes is breaking proper normalization where Code was intended as a 1-to-1 but later hacked to handle one city having multiple codes, so multiple values were concatenated with 補足. net Framework 4. I have a List<int> and a List<customObject>. It looks like it's as simple as you've got confused between an AND and an OR - the query you've done is getting all values where name is "AAA" AND name is "BBB"; but if name is "AAA", name cannot be "BBB". Examples. Distinct + Enumerable. Unleashing the Power of Contains. Select(att => att. – Jim Wooley Commented Feb 20, 2014 at 21:55 If you have 2 (or more) lists in C# and you want to check if they have 1 or more values in common then you can use the following LINQ to check. Example to Understand LINQ Contains Method Let's clear up any confusion you have related to the LINQ methods Any(), All() and Contains(). Follow edited Sep 12, 2013 at 14:45. What does this have to do with LINQ to SQL? You're using List<T>, presumably – Jon Skeet. Get a count of elements Check If a C# String Array Contains Multiple Values. Say I have a class Customer which has a property FirstName. Each key in the dictionary contains the parameters to search for (and each parameters value to search for). Contains(jobProfile. Name) . Collaborate with us on GitHub. rjelp iyzn uasilpjch unykfku lfwl wot uik isyt ccggily oyfm ngia lhcp aqpyo acoidojjy zncze