如何停止Windows窗体按钮被点击两次 [英] How to stop a Windows Forms Button being clicked twice

问题描述

我有一个Windows窗体按钮，提交Web请求表单上。我希望能够禁用按钮，它首先点击，然后重新启用它，当我得到回应的时候。我没有太多的控制权，code，它被调用以及它是如何被调用，所以我可以玩的是巴顿的事件，我也可以创建自己的按钮，它继承按钮，如下所示：

I've got a Windows Forms Button on a Form which submits a web request. I want to be able to disable the button when it is first clicked and then re-enable it when I get a response. I don't have much control over the code that is being called and how it is being called so all I can play around with are Button events or I can create my own button that inherits from Button like so:

public class SingleClickButton : Button
{
	protected override void OnClick(EventArgs e)
	{
		bool wasEnabled = this.Enabled;
		this.Enabled = false;

		if (wasEnabled)
		{
			base.OnClick(e);
		}
	}
}

我必须调用基OnClick方法最后的按钮将不会关闭，直到Web请求已完成。

I have to call the base OnClick method last as the button won't disable until the web request has completed.

我遇到的问题是，如果用户不点击多次的点击事件似乎建立和都还在执行。有可能的方式来取消所有排队的事件？或者是有一个更简单的解决我的问题？

The problem I am having is that if the user does click multiple times the click events seem to build up and are all still executed. Is there maybe a way to cancel all queued events? Or is there a far simpler solution to my problem?

推荐答案

您需要使用此方案：

public class SingleClickButton : Button
{
        protected override void OnClick(EventArgs e)
        {
                this.Enabled = false;
                RunAsynchronousMethod( CallBack );
                base.OnClick(e);
        }

        void CallBack()
        {
                this.Enabled = true;
        }
}

在RunAsynchronousMethod可以创建新的主题，或者使用ThreadPool.QueueUserWorkItem）。

The "RunAsynchronousMethod" can create new "Thread" or use "ThreadPool.QueueUserWorkItem)".

编辑：

public class SingleClickButton : Button {
        protected override void OnClick(EventArgs e) {
                this.Enabled = false;
                RunAsynchronousMethod( CallBack );
                base.OnClick(e);
        }

        void CallBack() {
                this.Enabled = true;
        }

        void RunAsynchronousMethod( Action callBack ) {
                // there you can use ThreadPool or Thread
                ThreadPool.QueueUserWorkItem( this.Worker, callBack );
        }

        void Worker( object callBack ) {
                try {
                    // some operations
                }
                finally {
                    // after operations was proceeded, the callback function will
                    // be called
                    ((Action)callBack)();
                }
        }
}

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