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

问题描述

我有一个WinForm，我创建一个按钮显示一个提示。这是一个自定义的WinForm视图，因为消息框对话框不够。

我有一个后台工作器启动并运行。如果myForm上的按钮被点击，我也想退出while（ aBackgroundWorker.IsBusy ）循环。

  // MyProgram.cs 
 
 using（CustomForm myForm = new CustomForm（））
 {
 myForm.Show（theFormOwner）; 
 myForm.Refresh（）; 
 
 while（aBackgroundWorker.IsBusy）
 {
 Thread.Sleep（1）; 
 Application.DoEvents（）; 
} 
} 
  

现在，在 CustomForm Button_clicked 事件，我有

  // CustomForm.cs 
 
 private void TheButton_Click（object sender，EventArgs e）
 {
 this.Close（）; 
} 
  

我需要在CustomForm类中添加更多的代码，我声明并初始化表单以便能够检测到一个闭包？

解决方案

要检测表单何时被关闭，你需要钩住FormClosed事件：

  this.FormClosed + = new FormClosedEventHandler（Form1_FormClosed）; 
 
 void Form1_FormClosed（object sender，FormClosedEventArgs e）
 {
 //做某事
} 
  

或者：

  using（CustomForm myForm = new CustomForm 
 {
 myForm.FormClosed + = new FormClosedEventHandler（MyForm_FormClosed）; 
 ... 
} 
 
 void MyForm_FormClosed（object sender，FormClosedEventArgs e）
 {
 //做某事
} 
  

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.

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();
    }
}

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

//CustomForm.cs

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

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?

解决方案

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
    }

Alternatively:

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

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

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