Is there an alternative to Dictionary/SortedList that allows duplicates? [duplicate]

Answer 1

That does not work. As soon as you return 0 from the comparer, it will throw "duplicate" exception.

You don't need classes encapsulation or anything, just make a comparer that does not return 0 (equal) result. Here is an example for int type of key

class MyComparer : IComparer
{

  public int Compare(int x, int y)
  {
    if (x < y)
      return -1;
    else return 1;
  }
}