Tell LINQ Distinct which item to return
- by Jon
I understand how to do a Distinct() on a IEnumerable and that I have to create an IEqualityComparer for more advanced stuff however is there a way in which you can tell which duplicated item to return?
For example say you have a List<T>
List<MyClass> test = new List<MyClass>();
test.Add(new MyClass {ID = 1, InnerID = 4});
test.Add(new MyClass {ID = 2, InnerID = 4});
test.Add(new MyClass {ID = 3, InnerID = 14});
test.Add(new MyClass {ID = 4, InnerID = 14});
You then do:
var distinctItems = test.Distinct(new DistinctItemComparer());
class DistinctItemComparer : IEqualityComparer<MyClass> {
public bool Equals(MyClass x, MyClass y) {
return x.InnerID == y.InnerID;;
}
public int GetHashCode(MyClassobj) {
return obj.InnerID.GetHasCode();
}
}
This code will return the classes with ID 1 and 3. Is there a way to return the ID matches 2 & 4.
