C# 在 Windows 窗体中单击关闭按钮时的事件处理程序
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An Event Handler when Close Button is clicked in windows form
提问by user962206
I was wondering if there are any event handlers if the user clicked the close button in a windows form. My initial plan was when the user clicked the close button, it will return a boolean to the caller or whoever called that form. for example
我想知道如果用户单击 Windows 窗体中的关闭按钮是否有任何事件处理程序。我最初的计划是当用户单击关闭按钮时，它将向调用者或调用该表单的任何人返回一个布尔值。例如
public void newWindow(){
NewForm nw = new NewForm();
nw.ShowDialog();
if(nw.isClosed){
do something
}
}
is that possible?
那可能吗？
采纳答案by Eric Dahlvang
If you are using .ShowDialog(), you can obtain a result via the DialogResult property.
如果您使用 .ShowDialog()，您可以通过 DialogResult 属性获取结果。
public void newWindow()
{
Form1 nw = new Form1();
DialogResult result = nw.ShowDialog();
//do something after the dialog closed...
}
Then in your click event handlers on Form1:
然后在 Form1 上的单击事件处理程序中：
private void buttonOk_Click(object sender, EventArgs e)
{
this.DialogResult = DialogResult.OK;
}
private void buttonCancel_Click(object sender, EventArgs e)
{
this.DialogResult = DialogResult.Cancel;
}
If you do not want to open the new form as a dialog, you can do this:
如果您不想将新表单作为对话框打开，您可以这样做：
public void newWindow()
{
Form2 nw = new Form2();
nw.FormClosed += nw_FormClosed;
nw.Show();
}
void nw_FormClosed(object sender, FormClosedEventArgs e)
{
var form = sender as Form2;
form.FormClosed -= nw_FormClosed; //unhook the event handler
//you can still retrieve the DialogResult if you want it...
DialogResult result = form.DialogResult;
//do something
}
回答by Mathieu
You're almost there!
您快到了！
You don't need the if(nw.isClosed), the line do somethingwill only get executed when nwwill be closed
您不需要if(nw.isClosed)，该行do something只会nw在关闭时执行
If you need to 'return' a value from that dialog, know this: The dialog is not immediatly released when you close it. So you can do something like this:
如果您需要从该对话框“返回”一个值，请注意：关闭对话框时不会立即释放该对话框。所以你可以做这样的事情：
NewForm nw = new NewForm();
nw.ShowDialog();
var x = nw.Property1
回答by Mark Hall
You should take a look at the FormClosingEvent or since you are using ShowDialogyou can do something like this. You can also change the DialogResultthat is returned in the FormClosingEvent.
你应该看看FormClosing事件，或者因为你正在使用ShowDialog你可以做这样的事情。您还可以更改事件中DialogResult返回的FormClosing。
DialogResult dr = nw.ShowDialog();
if (dr == DialogResult.Cancel)
{
//Do Stuff
}
