How can I write a function that runs when closing a wpf application?

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I want to write a function that runs on closing a wpf application. How can I do this for the Windows close button (which is there in the top right corner of a window)?

Posted 7-Mar-11 23:13pm

Member 7725461

Updated 7-Mar-11 23:27pm

LittleYellowBird

v2

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3 solutions

Solution 3

You will get the event handler automatically when you will select the Closing event from the help list in the "window" tag at XAML page. It will automatically generate an event at the code behind when you will select "new EventHandler" by pressing ctrl+spacebar inside the 'closing=""' commas.

XAML file example:

VB

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" Closing="Window_Closing" Closed="Window_Closed" >

Code behind example:

C#

private void Window_Closed(object sender, EventArgs e)
{
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e
{
}

Hope this helps :rose:

Anurag

Posted 8-Mar-11 0:22am

@nuraGGupta@

Updated 8-Mar-11 0:25am

v3

Comments

Tarun.K.S 8-Mar-11 6:27am

Exactly! 5d!

@nuraGGupta@ 8-Mar-11 6:29am

Thanks Tarun :-)

Solution 2

~~Thnaks so much for your time But I need to write some code for close window functionality, i know how to close the application.~~

For OP: You are supposed to provide information by either "improving your question" or by "adding a comment" to your question, unless you are providing a solution to your problem. :)

You comment has been moved to the comments section of intended recipient. :cool:

Posted 7-Mar-11 23:31pm

Member 7725461

Updated 8-Mar-11 0:35am

v3

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-03-08T04:39:00

…probably I did not read the question properly in first place, down-voted for a reason. Here is the answer:

C#

public partial class MyWindow : Window {
    protected override void OnClosing(System.ComponentModel.CancelEventArgs e) {
        base.OnClosing(e);
        // the process of closing can be canceled;
        // uncomment two next lines for a typical use of it:
        //e.Cancel = true;
        //Hide();
    }


    protected override void OnClosed(EventArgs e) {
        base.OnClosed(e);
        //...
    }

Alternatively, this is the event-based approach (which is not really needed because Window is sub-classed anyway:

C#

MyWindow.Closed += (sender, eventArgs) => {
    //...
};
MyWindow.Closing += (sender, eventArgs) => {
    //..
    // the process of closing can be canceled;
    // uncomment two next lines for a typical use of it:
    //e.Cancel = true;
    //Hide();
};

Both ways are much better than the code auto-generated by the Designer. It's funny that the code not based on anonymous methods is still used. It is less supportable but probably easier of generation (or code generation uses legacy code, which is explainable). Anonymous-based way is shorter and helps supportability, because writing a method with exact signature and writing type names is not required. Additionally, in lambda form the types of arguments are inferred from event type.

—SA