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CancelEventArgs::Cancel Property
Visual Studio 2010
Gets or sets a value indicating whether the event should be canceled.
Assembly: System (in System.dll)
The following example uses CancelEventArgs and a CancelEventHandler to handle the FormClosing event of a Form. This code assumes that you have created a Form with a class-level Boolean variable named isDataSaved. It also assumes that you have added a statement to invoke the OtherInitialize method from the form's Load method or the constructor (after the call to InitializeComponent).
private: // Call this method from the InitializeComponent() method of your form void OtherInitialize() { this->Closing += gcnew CancelEventHandler( this, &Form1::Form1_Cancel ); this->myDataIsSaved = true; } void Form1_Cancel( Object^ /*sender*/, CancelEventArgs^ e ) { if ( !myDataIsSaved ) { e->Cancel = true; MessageBox::Show( "You must save first." ); } else { e->Cancel = false; MessageBox::Show( "Goodbye." ); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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