通用Windows应用商店应用关闭时如何执行代码？

Question

I am developing an app for Windows 10 Store app, but I can't seem to find/learn on how to check if the user pressed the red close button (at the top right) or by pressing Alt + F4 . Basically what I want is something like this:

private void app_Close(object sender, CloseEventArgs e)
{
     //saves some data in the app :D
}

Answer 1

.: EDIT :.

If you have a Universal app that doesn't have a MainWindow object you'll probably want to tap into the "Suspending" event:

appObject.Suspending += (s, a) =>
        {
            SaveTheData(); // I really like my data and want it for later too
        };

or

public App()
    {
    /*
        stuff
     */
    Suspending += (s, a) =>
        {
            SaveTheData(); // I really like my data and want it for later too
        };
    }

.: Original :.

Add a handler to your MainWindow "Closing" event to save your data. Once "Closing" has finished, "Close" should fire normally.

theMainWindowObject.Closing += (s,a) =>
    {
        SaveTheData(); // It's precious!
    };

I have something similar to this in one of my smaller applications where in the constructor for MainWindow I put the above snippet substituting "theMainWindowObject" for "this" so that it references itself

So I have:

public MainWindow()
    {
    // Note: "this." isn't necessary here but it helps me with mental accounting
    this.Closing += (s, a) =>
        {
            Save();
        };
    }

If you're just saving one or two properties and don't have any crazy logic going on you can just drop it right in the handler:

public MainWindow()
    {
    Closing += (s, a) =>
        {
            Properties.Settings.Default.SettingsPopupX = mySettingsPopupObject.GetX();
            Properties.Settings.Default.SettingsPopupY = mySettingsPopupObject.GetY();
            Properties.Settings.Default.Save();
        };
    }

Answer 2

If you want to manage your Application Lifecycle have a look at this MSDN article: https://msdn.microsoft.com/en-us/library/windows/apps/mt243287.aspx In general you don't have a "close" event in Windows Apps. Your App will be suspended when Windows or your user wants to close it. Using the ApplicationExecutionState (see more) enum you can find out who (windows or your user) closed the app.

Hope it helps!