条件为假，但执行了 if 语句中的代码 [英] Condition false, but code inside the if statement executed

问题描述

我有以下方法:

public bool ConnectAsync()
{
    if (IsConnected)
        throw new InvalidOperationException("Socket is already connected");

    if (IsConnecting)
    {
        throw new InvalidOperationException("Attempt to connect in progress");
    }

    . . .
}

地点:

    private readonly object padLock = new object();

    private bool isConnecting = false;

    public bool IsConnected
    {
        get
        {
            lock (padLock)
            { return socket.Connected; }
        }
    }

    public bool IsConnecting
    {
        get
        {
            lock (padLock)
            { return isConnecting; }
        }

        private set
        {
            lock (padLock)
            { isConnecting = value; }
        }
    }

如果我的变量 isConnecting 为 false，为什么会执行 if 语句中的代码?

Why the code inside the if statement is executed if my variable isConnecting is false?

编辑:
如果我使用归档的 isConnecting 而不是属性 IsConnecting 我有相同的行为.代码在同一个线程中的任何地方运行.

Edit:
If I use the filed isConnecting instead of the property IsConnecting I have the same behavior. The code runs in the same thread anywhere.

编辑 2:

终于可以了:

lock (padLock)
{
    if (IsConnecting)
        throw new InvalidOperationException("Attempt to connect in progress");
}

这有效:

{
    if (IsConnecting)
        throw new InvalidOperationException("Attempt to connect in progress");
}

为什么?

推荐答案

调试器中的表达式窗口是触发异常的窗口，而不是您的代码.删除表达式(或监视)，它应该会按预期工作.

The Expression window you have in the debugger is the one triggering the exception, not your code. Remove expressions (or watch) and it should work as expected.

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