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

Because "a" != "a". At least, not always.

Contains() will check memory addresses, not the actual contents. You cannot insert the same object twice, and "a" isn't the same object as "a" (at least, not here).