Window.Close Method (System.Windows)

A Window can be closed using one of several, well-known, system-provided mechanisms located in its title bar, including:

• ALT+F4.

• System menu | Close.

• Close button.

A Window can also be closed using one of several well-known mechanisms within the client area that are provided by developers, including:

• File | Exit on a main window.

• File | Close or a Close button on a child window.

Note
OK and Cancel buttons on a dialog box are also developer-provided, although will likely set DialogResult, which automatically closes a window that was opened by calling ShowDialog.

These mechanisms require you to explicitly call Close to close a window.

Note
If a window, opened by calling ShowDialog, and with a Button with its IsCancel property set to true, will automatically close when the button is either clicked, or ESC is pressed. If the window was opened using Show, however, Close must be explicitly called, such as from Click event handler for the Button.

Closing a window causes the Closing event to be raised. If the Closing event isn't canceled, the following occurs:

• The Window is removed from Application.Windows (if an Application object exists).

• The Window is removed from the owner Window if the owner/owned relationship was established before the owned Window was shown and after the owner Window was opened.

• The Closed event is raised.

• Unmanaged resources created by the Window are disposed.

• If ShowDialog was called to show the Window, ShowDialog returns.

Closing a Window causes any windows that it owns to be closed. Furthermore, closing a Window may cause an application to stop running depending on how the Application.ShutdownMode property is set.

Note
This method cannot be called when a window is hosted in a browser.

The following example shows a File | Exit menu being handled to explicitly call Close.

<MenuItem Name="fileExitMenuItem" Header="E_xit" Click="fileExitMenuItem_Click"></MenuItem>

Private Sub fileExitMenuItem_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    ' Close this window
    Me.Close()
End Sub

void fileExitMenuItem_Click(object sender, RoutedEventArgs e)
{
    // Close this window
    this.Close();
}

.NET Framework

.NET Framework Client Profile

• UIPermission  

  for permission to use all windows and user input events without restriction. Associated enumeration: AllWindows

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference