How to make C# Windows Runtime Component types equ

Question

I'm writing a Windows Runtime Component in C#. I want to implement the IEquatable interface in some of my types. I don't need to expose the Equals method to the consumers of the component, I just want my unit tests to be able to compare between instances. Implementing IEquatable is not allowed because it's a generic type. What would be the best alternative?

Answer 1

According to https://msdn.microsoft.com/EN-US/library/bsc2ak47(v=vs.110).aspx?cs-save-lang=1&cs-lang=csharp

The .Net Framework supplies default implementation for ToString(), Equals(Object) and GetHashCode to WinRT types.

When the default EqualityComparer is used on a type that does not implement IEquatable it defaults to Equals(Object).

So to mimic IEquatable for a WinRT type you just need to override Object.Equals on your type. This requires you also override GetHashCode.

Here is an example class:

using System;

public sealed class BindableInt
{
  public BindableInt(int i = 0)
  {
   Value = i;
  }
  public int Value { get; set; }
  public string String
  {
    get 
    {
      return Value.ToString();
    }
  }
  public override bool Equals(object obj)
  {
    if (!(obj is BindableInt)) return false;
      return Value.Equals(((BindableInt)obj).Value);
  }
  public override int GetHashCode()
  {
    return Value.GetHashCode();
  }
}

Answer 2

Unfortunately there is no mechanism for implementing deep comparison between two winrt types :(.