Return Results from a DialogBox in WPF

XAML Designer
May 28 2012
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Before a dialog box closes, its DialogResult property should be set with a Nullable<(Of <(T>)>) Boolean that indicates how the user closed the dialog box. This value is returned by ShowDialog to allow client code to determine how the dialog box was closed and, consequently, how to process the result.

DialogBoxWithResult dialogBoxWithResult = new DialogBoxWithResult();
// Open dialog box and retrieve dialog result when ShowDialog returns
bool? dialogResult = dialogBoxWithResult.ShowDialog();
switch (dialogResult)
{
 case true:
 // User accepted dialog box
 break;
 case false:
 // User canceled dialog box
 break;
 default:
 // Indeterminate
 break;
}