InvalidAsynchronousStateException在功能上是否需要控制调用，检查 [英] InvalidAsynchronousStateException in function that checks if invoke is required for control

问题描述

我用一个堆栈溢出用户的这一功能礼貌从的BackgroundWorker 更新控制。

I use this function courtesy of a Stack Overflow user to update controls from a BackgroundWorker.

static void SynchronizedInvoke(ISynchronizeInvoke sync, Action action)
{
    // If the invoke is not required, then invoke here and get out.
    if (!sync.InvokeRequired)
    {
        // Execute action.
        action();

        // Get out.
        return;
    }

    // Marshal to the required thread.
    sync.Invoke(action, new object[] { });
}

本功能已经完美地工作到现在。我刚刚得到这个异常：

This function has worked perfectly until now. I just got this exception:

这是什么意思？我如何预防呢？

What does this mean and how do I prevent it?

推荐答案

的这里的问题是，到了 ISynchronizeInvoke 对象绑定的线程不再存在。如果你生成一个后台线程和后台任务完成之前UI线程退出发生这种情况的例子。线程不再存在，因此没有什么要调用的，你得到的异常。

The problem here is that the thread to which the ISynchronizeInvoke object was bound to no longer exists. This can happen for example if you spawn a background thread and the UI thread exits before the background task completes. The thread no longer exists hence there's nothing to invoke to and you get the exception.

还有就是要防止这种情况没有什么好办法。行动最好的办法是包装在的try / catch 负责处理该异常的调用电话。

There is no good way to prevent this. The best course of action is to wrap the Invoke call in a try / catch which handles this exception.

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