Keep WPF application alive on Closing

Question

There are questions about this already, but this is a bit different so I'm asking. This is my xaml inside Window :

<i:Interaction.Triggers>
    <i:EventTrigger EventName="Closing">
        <i:InvokeCommandAction Command="{Binding ClosingCommand}" />
    </i:EventTrigger>
</i:Interaction.Triggers>

This is closing Command :

public virtual ICommand ClosingCommand
{
    get { return new RelayCommand(ClosingExecute); }
}

This is Execute :

public virtual void ClosingExecute()
{
   MessageBoxResult result = MessageBox.Show("Close the application?", "Shut Down", MessageBoxButton.YesNo);

    if(result == MessageBoxResult.Yes)
    {
        Application.Current.Shutdown();
    }
    else
    {
       //I don't know what to write
    }

}

How can I keep my application alive in this situation? Thanks.

Can't you just do nothing? What causes the app to close the code doesn't enter your if statement? — Ben Robinson, Sep 19 '14 at 14:45
When I click no, the application shuts down. I guess it's because it's in Closing — jason, Sep 19 '14 at 14:46
http://stackoverflow.com/questions/3101801/mef-wpf-cancel-application-current-shutdown-by-plugins discusses about Close rather than shutdown — Andrew Grinder, Sep 19 '14 at 14:47

score 2 · Accepted Answer · edited May 23 '17 at 12:17

From the documentation of Closing

Closing can be handled to detect when a window is being closed (for example, when Close is called). Furthermore, Closing can be used to prevent a window from closing. To prevent a window from closing, you can set the Cancel property of the CancelEventArgs argument to true.

You need to hook up an event handler to this event and set Cancel to true.

If you want to do this in an mvvmy way, this answer might help you hook up your eventargs to the command parameter

score 1 · Answer 2 · edited May 23 '17 at 11:46

1

<Application
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="MainWindow.xaml"
    ShutdownMode="OnExplicitShutdown">
</Application>

ShutdownMode="OnExplicitShutdown"

Source: https://stackoverflow.com/a/9992888/3855622

edited May 23 '17 at 11:46

Community

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answered Apr 26 '17 at 21:00

Grigor Yeghiazaryan

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Keep WPF application alive on Closing

2 Answers2