覆盖C#条件语句问题

Question

我今天写了一些代码,有些东西没有像我预期的那样工作.

为什么即使条件应该评估为false,下面的代码也会执行？

替代文字http://img215.imageshack.us/img215/3011/agfewrf.gif

我已经尝试围绕这两个条件,并切换它们的位置,但EndedUsingApplication甚至仍然执行.

编辑:

它与||无关 或&&运营商.看这个...

alt text http://img20.imageshack.us/img20/6655/aaaaaal.gif

没有人可以从我的错误中吸取教训,除非我发布了罪魁祸首代码,所以在这里.

  public static bool operator ==(ActiveApplication a, ActiveApplication b)
     {
     if ((object)a == null || (object)b == null)
        return false;
     return a.process_name == b.process_name && a.window_title == b.window_title;
     }

  public static bool operator !=(ActiveApplication a, ActiveApplication b)
     {
     return a == b ? false : true;
     }

这是工作代码......

  public static bool operator ==(ActiveApplication a, ActiveApplication b)
     {
     // Casting to object class prevents this comparison operator being executed
     // again and causing an infinite loop (which I think .NET detects and stops
     // but it would still be a huge hole in the logic.
     if ((object)a == null && (object)b == null)
        return true;
     if ((object)a == null ^ (object)b == null)
        return false;
     return a.process_name == b.process_name && a.window_title == b.window_title;
     }

  public static bool operator !=(ActiveApplication a, ActiveApplication b)
     {
     return a == b ? false : true;
     }

问题似乎是!=运算符收到两个空值.

Answer 1

你超载了!=吗？