WPF 应用程序 OnExit 事件
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WPF application OnExit event
提问by Gab
I have a WPF application with a main Window.
我有一个带有主窗口的 WPF 应用程序。
In App.xaml.cs, in the OnExit event, I would like to use a method from my MainWindow code behind...
在 App.xaml.cs 的 OnExit 事件中，我想使用我的 MainWindow 代码中的一个方法......
public partial class App
{
private MainWindow _mainWindow;
protected override void OnStartup(StartupEventArgs e)
{
_mainWindow = new MainWindow();
_mainWindow.Show();
}
protected override void OnExit(ExitEventArgs e)
{
_mainWindow.DoSomething();
}
}
The method :
方法 ：
public void DoSomething()
{
myController.Function(
(sender, e) =>
{
},
(sender, e) =>
{
}
);
}
But I put a breakpoint on the "_mainWindow.DoSomething();" and when I press f11, it doesn't enter into the function and the function does nothing... Am I missing something ?
但是我在“_mainWindow.DoSomething();”上放了一个断点 当我按 f11 时，它没有进入函数，函数什么也不做......我错过了什么吗？
I'm a beginner, is it possible to do what I need ?
我是初学者，可以做我需要的吗？
EDIT : post edited
编辑：帖子编辑
回答by RazorEater
You declared your _mainWindow as the Window class. The Window class does not have a DoSomething function. Change the class of _mainWindow to MainWindow and it should work.
您将 _mainWindow 声明为 Window 类。Window 类没有 DoSomething 函数。将 _mainWindow 的类更改为 MainWindow，它应该可以工作。
public partial class App
{
private MainWindow _mainWindow;
...
}
回答by Dhaval Patel
your app.cs shoule look like
你的 app.cs 看起来像
public partial class App : Application
{
private MainWindow _mainwindow;
public MainWindow mainwindow
{
get { return _mainwindow??(_mainwindow=new MainWindow()); }
set { _mainwindow = value; }
}
protected override void OnStartup(StartupEventArgs e)
{
_mainwindow.Show();
}
protected override void OnExit(ExitEventArgs e)
{
_mainwindow.DoSomething();
}
}
回答by Markus
Class Window does not have the member DoSomething, class MainWindow does (derived from Window).
类 Window 没有成员 DoSomething，类 MainWindow 有（派生自 Window）。
Either change
要么改变
private Window _mainWindow;
to
到
private MainWindow _mainWindow;
or cast your method call like this
或者像这样投射你的方法调用
((MainWindow)_mainWindow).DoSomething();
