按钮单击其他方法 [英] Button click in other method

问题描述

嗨我有一个场景，任何人都可以解决这个问题..

我在课堂上点击了一个按钮并且工作正常OK.but我想知道是否再次点击该按钮当一个事件被触发时。如果我发现该按钮被点击，那么我必须停止它的动作。

Hi I have a scenario here can anyone sort out this..
I performed a button click in a class and its working fine OK.but I want to find that whether that button is clicked again when an event is fired. If i find that button is clicked then i have to stop its action.

推荐答案

这比初看起来更复杂。

问题是，除非你特别编写代码，否则你的应用程序只有一个线程。因此，如果您在按钮上开始长时间操作，请单击：

That's more complex than it seems at first glance.
The problem is that unless you specifically code it otherwise, your application has only one thread. So if you start a long operation on a button click:

private void MyButton_Click(object sender, EventArgs e)
    {
    for (int i = 0; i < 10000000; i++)
        {
        DoIt();
        }
    }

然后在长操作完成之前不会发生任何其他事情 - 因为线程忙于执行长操作。

为了让按钮完全工作以停止操作，您必须将操作移动到新线程。这并不难，但确实需要一点工作。最简单的方法是使用BackgroundWorker：

Then nothing else will happen until the long operation is completed - because the thread is busy doing the long operation.
In order to get the button to work at all in order to stop the operation, you have to move the operation to a new thread. That's not difficult, but it does need a little work. The easiest way to do it is to use a BackgroundWorker:

private BackgroundWorker worker = null;
private void MyButton_Click(object sender, EventArgs e)
    {
    worker = new BackgroundWorker();
    worker.DoWork += worker_DoWork;
    worker.RunWorkerCompleted += worker_RunWorkerCompleted;
    worker.WorkerSupportsCancellation = true;
    worker.RunWorkerAsync();
    }

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
    }

void worker_DoWork(object sender, DoWorkEventArgs e)
    {
    for (int i = 0; i < 10000000; i++)
        {
        DoIt();
        }
    }

然后您可以使用它来取消长时间操作：

Then you can use that to cancel the long operation:

private BackgroundWorker worker = null;
private void MyButton_Click(object sender, EventArgs e)
    {
    if (worker == null)
        {
        worker = new BackgroundWorker();
        worker.DoWork += worker_DoWork;
        worker.RunWorkerCompleted += worker_RunWorkerCompleted;
        worker.WorkerSupportsCancellation = true;
        worker.RunWorkerAsync();
        }
    else
        {
        worker.CancelAsync();
        }
    }

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
    worker = null;
    }

void worker_DoWork(object sender, DoWorkEventArgs e)
    {
    BackgroundWorker worker = sender as BackgroundWorker;
    if (worker != null)
        {
        for (int i = 0; i < 10000000 && !worker.CancellationPending; i++)
            {
            DoIt();
            }
        }
    }

你好，



在您的情况下，首先检查您的全局文件，请检查开始请求代码，因为如果发生了某些事情，则每个请求都会触发evnt。

Hello,

In your case firstly check your global file, kindly check begin request code just because if something happen in this the on each request evnt is fired.

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