MDI子表单C#

当单击“X”按钮并让父窗体知道它已关闭时，如何检查MDI子窗体的关闭事件

在FormClosing事件表单中，您可以执行

TheMainForm form = (TheMainForm)this.MdiParent()
form.AlertMe( this );

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在FormClosing事件表单中，您可以执行以下操作

TheMainForm form = (TheMainForm)this.MdiParent()
form.AlertMe( this );

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您只需在MDI中侦听FormClosed事件

var childForm = new ChildForm();
childForm.FormClosed += new FormClosedEventHandler(form_FormClosed);
childForm.Show();

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您只需在MDI中侦听FormClosed事件

var childForm = new ChildForm();
childForm.FormClosed += new FormClosedEventHandler(form_FormClosed);
childForm.Show();

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将已关闭事件从主窗体中附加到子窗体

Form mdiChild = new Form();
mdiChild.MdiParent = this;
mdiChild.Closed += (s, e) => { //... };
mdiChild.Show();

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未检查代码，但不应太难

从主窗体中将关闭的事件附加到子窗体

Form mdiChild = new Form();
mdiChild.MdiParent = this;
mdiChild.Closed += (s, e) => { //... };
mdiChild.Show();

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没有检查代码，但应该没有那么难

好吧，下面的代码显示了父窗体如何识别子窗体是否已关闭，并且它还可以识别是否有任何新的子窗体添加到该父窗体中

private List<Form> ChildFormList = new List<Form>();

private void MyForm_MdiChildActivate(object sender, EventArgs e)
{
   Form f = this.ActiveMdiChild;

   if (f == null)
   {
    //the last child form was just closed
    return;
   }

   if (!ChildFormList.Contains(f))
   {
      //a new child form was created
      ChildFormList.Add(f);
      f.FormClosed += new FormClosedEventHandler(ChildFormClosed); // here the parent form knows that that child form has been closed or not
  }
  else
  {
    //activated existing form
  }
}
private void ChildFormClosed(object sender, FormClosedEventArgs e)
{
   //a child form was closed
    Form f = (Form)sender;
    ChildFormList.Remove(f);
}

private List ChildFormList=new List（）；
私有void MyForm_MdiChildActivate（对象发送方，事件参数e）
{
Form f=this.ActiveMdiChild；
如果（f==null）
{
//最后一个子表单刚刚关闭
返回；
}
如果（！ChildFormList.Contains（f））
{
//创建了一个新的子窗体
子表单列表。添加（f）；
f、 FormClosed+=新FormClosedEventHandler（ChildFormClosed）；//这里父窗体知道该子窗体是否已关闭
}
其他的
{
//激活现有表单
}
}
私有void ChildFormClosed（对象发送方，FormClosedEventArgs e）
{
//子窗体已关闭
表格f=（表格）发送者；
ChildFormList.Remove（f）；
}

下面的代码显示了父窗体如何识别子窗体是否已关闭，并且还可以识别是否有任何新的子窗体添加到父窗体中

private List<Form> ChildFormList = new List<Form>();

private void MyForm_MdiChildActivate(object sender, EventArgs e)
{
   Form f = this.ActiveMdiChild;

   if (f == null)
   {
    //the last child form was just closed
    return;
   }

   if (!ChildFormList.Contains(f))
   {
      //a new child form was created
      ChildFormList.Add(f);
      f.FormClosed += new FormClosedEventHandler(ChildFormClosed); // here the parent form knows that that child form has been closed or not
  }
  else
  {
    //activated existing form
  }
}
private void ChildFormClosed(object sender, FormClosedEventArgs e)
{
   //a child form was closed
    Form f = (Form)sender;
    ChildFormList.Remove(f);
}

private List ChildFormList=new List（）；
私有void MyForm_MdiChildActivate（对象发送方，事件参数e）
{
Form f=this.ActiveMdiChild；
如果（f==null）
{
//最后一个子表单刚刚关闭
返回；
}
如果（！ChildFormList.Contains（f））
{
//创建了一个新的子窗体
子表单列表。添加（f）；
f、 FormClosed+=新FormClosedEventHandler（ChildFormClosed）；//这里父窗体知道该子窗体是否已关闭
}
其他的
{
//激活现有表单
}
}
私有void ChildFormClosed（对象发送方，FormClosedEventArgs e）
{
//子窗体已关闭
表格f=（表格）发送者；
ChildFormList.Remove（f）；
}

C中没有.AlertMe（）方法，我找不到MDiParent方法，只有属性。您可以创建自己的，并将其公开C中没有.AlertMe（）方法，我找不到MDiParent方法，只有属性。您可以创建自己的，并将其公开