ObservableCollection.Contains() Doesn't Work Correctly

Question

Consider the following:

class Bind
{
    public string x { get; set; }
    public string y { get; set; }
}
public partial class MainWindow : Window
{
    pub         


        

Answer 1

The 'Contains' method uses the Equals on object, and this simply checks that the memory addresses are different.

Consider changing your class to this...

 class Bind : IEquatable {
     public string x { get; set; }
     public string y { get; set; }
     public bool Equals(Bind other)
     {
         return x == other.x && y == other.y; 
     } 
}

Your loop will then visit the strongly typed Equals method in your class, and this will result in the behaviour you are after.

NOTE: the string class ALSO inherits from IEquatable of T and that is what allows the equality operator to operate on the content of the string rather than the address of the string.