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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