This documentation is archived and is not being maintained.

PreProcessInputEventArgs Class

Provides data for preprocess input events.

Namespace:  System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)

public sealed class PreProcessInputEventArgs : ProcessInputEventArgs
You cannot directly create an instance of this class in XAML.

Canceling a pre-process input stops the input from being processed further. Listen for the PreNotifyInput to determine if another handler canceled a pre-process input.

The input staging area processes input into WPF events.

All PreProcessInput event handlers are called, even if one of the handlers cancels the input. To verify if a handler further up the tree canceled the input, listen for the PreNotifyInput event.

PreProcessInputEventArgs is used with the PreProcessInput event.

Input is processed in WPF in the follow stages:

  1. Pre-process stage. The input manager raises the PreProcessInput event.

  2. Pre-notify stage. The input manager raises the PreNotifyInput event.

  3. The WPF input event or events are raised.

  4. Post-notify stage. The input manager raises the PostNotifyInput event.

  5. Post-process stage. The input manager raises the PostProcessInput event.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0