2024 C# list intersect by property

C# list intersect by property

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WebJun 29, 2011 · If you have lists of objects and want to get the common objects for some property then use; var commons = TestList1.Select (s1 => s1.SomeProperty).ToList ().Intersect (TestList2.Select (s2 => s2.SomeProperty).ToList ()).ToList (); Note: SomeProperty refers to some criteria you want to implement. Share Follow answered … WebIntersect on the other hand will find elements that are in both IEnumerable 's. If you are looking for just a list of ID's, you can do the following which takes advantage of Intersect var ids = original.Select (x => x.ID).Intersect (yourEnumerable); Share Improve this answer Follow answered Mar 4, 2010 at 16:51 David Pfeffer 38.6k 30 126 202

c# - Using LINQ to objects Intersect and Except on a specific property …

WebJan 3, 2024 · var names = list2.Select (item => item.Name); var result = list1.Where (item => names.Contains (item.Name)); It would also scale better at large values if 'names' was a set and not an enumeration. All in all if performance is an issue I wouldn't use Linq at all though, as you need to re-create structures in order to make it work. WebTry this, it works but I'd really like to get rid of the .ToList() in the aggregate. var list1 = new List() { 1, 2, 3 }; var list2 = new List() { 2, 3, 4 ... spedition ntl

c# - intersect two lists with same object but diffrent variables ...

WebIf you wanted to perform an intersection on two completely different types which happened to have a common property type, you could make a more general method with three type parameters (one for first, one for second, and one for the common key type). Share Improve this answer Follow edited May 11, 2024 at 8:13 Dmitrii Dovgopolyi 6,157 2 27 44 WebJun 23, 2024 · To find intersection of two lists in C#, use the Intersect () method. The following is our list 1. List list1 = new List (); list1.Add (2); list1.Add (3); list1.Add (5); list1.Add (7); The following is our list 2. List list2 = new List (); list2.Add (5); list2.Add (4); list2.Add (6); list2.Add (8); WebNov 8, 2024 · The IntersectBy () method can be used to find users who do not share a birth year with anyone from the opposite set. public void Examples() { var users = GetUserList(); var users2 = GetUserList2(); var intersectionBirthYear = users.IntersectBy( users2.Select( x => x. DateOfBirth. Year), x => x. DateOfBirth. spedition nrw

c# - Compare Two Lists Via One Property Using LINQ - Stack Overflow

c# 4.0 - Intersect two List<> in C# - Stack Overflow

WebIntersect Two Lists in C#. List data1 = new List {1,2,3,4,5}; List data2 = new List {"6","3"}; The lambda expression should return true if data1 … Web如果我有一個窗口，我如何確保該窗口永遠不會隱藏在屏幕之外這很重要，因為有時如果用戶添加或刪除監視器，如果我們記得之前的位置，窗口可能會永久隱藏在屏幕之外。我正在使用wpf mvvm 。 spedition nlg mannheimWebJun 26, 2013 · Intersect can be more or less thought of as a special case of Join where the two sequences are of the same type, and can thus be applied for equality instead of needing a projection for each type to generate a key to compare. Given your case, Intersect isn't … spedition nothegger

"WebFeb 21, 2016 · You could use the Intersect method: var c = a.Intersect (b); This return all values both in a and b. However, position of the item in the list isn't taken into account. Share Improve this answer Follow answered Feb 21, 2011 at 11:56 Femaref 60.5k 7 136 176 51 To save a google for others who come across this, the opposite LINQ method is … " - C# list intersect by property

C# list intersect by property

intersection - Intersect Two Lists in C# - Stack Overflow

WebMar 14, 2024 · Sorted by: 58 Well, if you use LINQ's Intersect method it will build up a HashSet of the second sequence, and then check each element of the first sequence against it. So it's O (M+N)... and you can use foo.Intersect (bar).Any () to get an early-out. WebSep 1, 2024 · Difference between Union, Intersect, Distinct, and Except. Use of Union. Union is an extension method to merge two collections. It requires at least two collections to perform the merge operation, but that merged collection holds only the distinct elements from both the collections. For better understanding, we will use an example.

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WebThe LINQ Intersect Method in C# is used to return the common elements from both collections. The elements that are present in both data … WebJun 19, 2015 · try intersecting on a unique property instead of the object return Users.Where (user=>user.Companys.Select (c => c.ID).Intersect (admin.Companys.Select (a => a.id)).Any ()) .ToList (); Share Improve this answer Follow answered Jun 19, 2015 at 14:14 johnny 5 19.3k 50 115 191 Add a comment Your Answer Post Your Answer

WebJun 9, 2024 · I would like to return samples from ListOfSamples2 that intersect with the samples that exist in ListOfSamples1 where the SampleState is opposite. For instance ListOfSamples2[0] has a StartTime and EndTime that does reside in ListOfSamples1[0] and their states are opposite. WebApr 10, 2024 · Now, to get each enrollment id, the name of the student, and the name of the course we need to perform a select operation on the join result. Let’s create a new method, GetEnrolments (): public static IEnumerable GetEnrolments(. IEnumerable enrolments) {.

WebFeb 20, 2014 · 2 Answers Sorted by: 61 The Except method requires that the two collection types involved have the same element type. In this case the element types are different ( object1 and object2) hence Except isn't really an option. A … WebC# 通过将其他属性与不同列表进行比较，从源列表中选择ID,c#,generics,lambda,generic-list,C#,Generics,Lambda,Generic List ... 一种方法是编写自己的EqualityComparator，并使用上述结果中@Alex所示的Exception和Intersect列出结果，这是一种可靠的代码，也是可重用的，但是如果您希望 ...

WebJul 8, 2012 · 2 Answers. Sorted by: 6. Intersect returns an IEnumerable, so the correct way is: var loads = l1.Intersect (l2).ToList (); ToList creates a List from an IEnumerable. Note that you can omit the type argument when invoking Intersect, the compiler is smart enough to infer it. Share. Improve this answer.

Webvar interset = list1.Where (a => list2.Any (b => a.name = b.name)).ToList (); If the lists could be large you might want to make a lookup from the second list var lookup = list2.ToLookup (x => x.name); var insterset = list1.Where (a => lookup.Contains (a.name)); Or maybe just a HashSet of the names spedition ntg air and oceanWebJun 23, 2024 · To find intersection of two lists in C#, use the Intersect() method. The following is our list 1. List list1 = new List(); list1.Add(2); list1.Add(3); … spedition noldenWeb1 day ago · I have two set of lists and I want to create one list with unique values and other with existing if number and name matches. So that I can do Update/Insert operation accordingly. My criteria are: if number and name matches in list1 and list2 then it will be part of existingRecords list; else move them to newRecords list; Current List: spedition ntuWebThe LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. data source) contains a specified element or not. If the data source contains the specified element, then it returns true else returns false. There are there Contains Methods available in C# and they are implemented in two different namespaces. spedition nuss gmbh wörth jobsWebFeb 28, 2015 · which I can get as , testListA.Select (x => x.ProductID).Except (testListB.Select (x => x.ProductID )); 2)No longer has a record which has a matching ProductID and Category in testListB which I Can get using, testListA.Where (a => testListB.Any (b => a.ProductID == b.ProductID && a.Category != b.Category)); **My … spedition ntsWebApr 7, 2024 · You can use Intersect, first implemet IEqualityComparer for the Student model: class StudentComparer : IEqualityComparer { public bool Equals(Student? x, Student? y) => x.StudenId == y.StudenId; public int GetHashCode([DisallowNull] Student obj) => obj.StudenId.GetHashCode(); } Then you are able to use Intersect as follows: spedition nussbaumerWebMay 23, 2016 · You can also use Intersect (var result = peopleList1.Intersect(peopleList2);), but that would need you to implement an extra IEqualityComparer or override Person's Equals and GetHashCode methods in a way that two Person instances with the same ID are regarded equal. Intersect would … spedition nuss wörth