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If I have an IEnumerable where ClassA exposes an ID property of type long. Is it possible to use a Linq query to get all instances of ClassA with ID belonging to a second IEnumerable?
In other words, can this be done?
IEnumerable<ClassA> = original.Intersect(idsToFind....)? where original is an IEnumerable<ClassA> and idsToFind is IEnumerable<long>.
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LINQ Intersect operator is used to find common elements between two sequences (collections). Intersect opertor comes under Set operators category in LINQ Query operators. For example, we have two collections A = { 1, 2, 3 } and B = { 3, 4, 5 }. Intersect operator will find common elements in both sequences.
Firstly, set two lists. List<int> val1 = new List<int> { 25, 30, 40, 60, 80, 95, 110 }; List<int> val2 = new List<int> { 27, 35, 40, 75, 95, 100, 110 }; Now, use the Intersect() method to get the intersection between two lists.
CsharpProgrammingServer Side Programming. The Union method gets the unique elements from both the lists. Let us set two lists − var list1 = new List<int>{12, 65, 88, 45}; var list2 = new List<int>{40, 34, 65}; Now get the union of both the lists − var res = list1.Union(list2);
Yes.
As other people have answered, you can use Where, but it will be extremely inefficient for large sets.
If performance is a concern, you can call Join:
var results = original.Join(idsToFind, o => o.Id, id => id, (o, id) => o); If idsToFind can contain duplicates, you'll need to either call Distinct() on the IDs or on the results or replace Join with GroupJoin (The parameters to GroupJoin would be the same).
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