namespace System.Diagnostics
{
  internal static class MyDebug
  {
    [Conditional("DEBUG"), DebuggerNonUserCode()]
    public static void Assert(bool condition)
    {
      MyDebug.Assert(condition, string.Empty);
    }

    [Conditional("DEBUG"), DebuggerNonUserCode()]
    public static void Assert(bool condition, string message)
    {
      // no op if condition is true
      if (condition) return;

      // else if false create assert message for device display and Output window
      string assMsg = "---- DEBUG ASSERTION FAILED ----" + Environment.NewLine
                      + message + Environment.NewLine
#if !NETFX_CORE // can't get stack trace in WinRT
                      + new StackTrace().ToString()
#endif
                      ;

      // ...then output the assert message...
      Debug.WriteLine(assMsg);

      // ...and display the message
      // ...and break in the debugger
#if NETFX_CORE
      Contracts.Contract.Assert(condition, message);
#else
      try
      {
        System.Windows.MessageBox.Show(assMsg);
      }
      catch (InvalidOperationException) { /* e.g. called from launch code on WP8 */}

      Debugger.Break();
#endif
    }
  }
}