在比较操作C＃奇怪的结果 [英] c# Strange result on compare operation

问题描述

我有我的C＃code（asp.net code后面）一个奇怪的行为。我张贴在这里的监视窗口的截图：

I have a strange behavior on my c# code (asp.net code behind). I post here a screenshot of the watch window:

我有一个为空（因为你可以看到）和比较的对象用户：用户== NULL返回false。我不明白为什么！

I have an object user that is null (as you can see) and the compare: user == null returns false. I don't understand why!

是有人在这里可以解释为什么出现这种情况？

Is someone here that can explain why this happens?

推荐答案

那么你可以很容易地编写自己的类，它将使这一结果：

Well you can easily write your own class which would give that result:

public class Evil
{
    public static bool operator ==(Evil lhs, Evil rhs)
    {
        return false;
    }

    public static bool operator !=(Evil lhs, Evil rhs)
    {
        return false;
    }
}

我们只是猜测，此刻...但是，这解释了症状。

We're only guessing, at the moment... but that explains the symptoms.

（我只是试着重写的ToString，我不能得到所需的输出。）

(I've just tried overriding ToString, and I can't get the desired output.)

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