如何取消winforms中的任何事件? [英] How to cancel any event in winforms?

问题描述

我想取消该函数范围内的事件.

I want to cancel an event from within that function scope.

例如.我按下按钮单击事件并在错误验证时，我想取消此事件.同样，我也想取消其他活动.

Eg. I pressed button click event and on false validation, I want to cancel this event. Likewise i want to cancel other events also.

我如何在 C# 中做到这一点

How can i do this in C#

推荐答案

视场景而定；在大多数情况下:而不是 cancel 事件，什么也不做，例如:

It depends on the scenario; in most cases: rather than cancel the event, just do nothing, for example:

private void SaveDataClicked(object sender, EventArgs args) {
    if(!ValidateData()) return;
    // [snip: code that does stuff]
}

或:

private void SaveDataClicked(object sender, EventArgs args) {
    if(ValidateData()) {
        // [snip: code that does stuff]
    }
}

有些事件会暴露 CancelEventArgs(或类似的)，允许通过 args 取消一些 外部 行为 - 形式 -关闭是最明显的例子(设置 e.Cancel = true;).

There are some events that expose a CancelEventArgs (or similar), allowing to to cancel some external behaviour via the args - form-closing being the most obvious example (set e.Cancel = true;).

请注意，在这种情况下，我不会在按钮上显示自动对话结果；当(如果)处理程序成功完成时手动应用.

Note that in this scenario I would not have an automatic dialog-result on the button; apply that manually when (if) the handler completes successfully.

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