检测表单何时关闭c# [英] Detect when a form has been closed c#

问题描述

我创建了一个 WinForm，它显示带有按钮的提示.这是一个自定义的 WinForm 视图，因为消息框对话框是不够的.

I have a WinForm that I create that shows a prompt with a button. This is a custom WinForm view, as a message box dialog was not sufficient.

我有一个后台工作程序已启动并正在运行.如果单击 myForm 上的按钮，我还想退出 while(aBackgroundWorker.IsBusy) 循环.

I have a background worker started and running. I also want to exit the while(aBackgroundWorker.IsBusy) loop if the button on myForm was clicked.

//MyProgram.cs

using(CustomForm myForm = new CustomForm())
{
    myForm.Show(theFormOwner);
    myForm.Refresh();

    while(aBackgroundWorker.IsBusy)
    {
        Thread.Sleep(1);
        Application.DoEvents();
    }
}

现在，在 CustomForm 的 Button_clicked 事件中，我有

Right now, in the CustomForm the Button_clicked event, I have

//CustomForm.cs

private void theButton_Click(object sender, EventArgs e)
{
  this.Close();
}

我是否需要向 CustomForm 类或声明和初始化表单的位置添加更多代码才能检测到闭包?

Do I need to add more code to the CustomForm class, or the location where I declare and initialize the form in order to be able to detect a closure?

推荐答案

要检测表单何时真正关闭，需要挂钩 FormClosed 事件:

To detect when the form is actually closed, you need to hook the FormClosed event:

    this.FormClosed += new FormClosedEventHandler(Form1_FormClosed);

    void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        // Do something
    }

或者:

using(CustomForm myForm = new CustomForm())
{
    myForm.FormClosed += new FormClosedEventHandler(MyForm_FormClosed);
    ...
}

void MyForm_FormClosed(object sender, FormClosedEventArgs e)
{
    // Do something
}

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