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WorkflowDesignerMessageFilter.OnKeyDown Method

Occurs when a key is pressed.

Namespace:  System.Workflow.ComponentModel.Design
Assembly:  System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)

protected virtual bool OnKeyDown(
	KeyEventArgs eventArgs


Type: System.Windows.Forms.KeyEventArgs

A KeyEventArgs that contains information about the event.

Return Value

Type: System.Boolean
true if the message is handled; otherwise, false.

OnKeyDown occurs when a key is pressed when a specific object has focus.

The following code example shows how to override the OnKeyDown method to customize how to remove activities from a workflow design surface.

This code example is part of the Basic Designer Hosting SDK Sample from the DesignerShell.cs file. For more information, see Basic Designer Hosting.

protected override bool OnKeyDown(KeyEventArgs eventArgs)
    if (eventArgs.KeyCode == Keys.Delete)
        ISelectionService selectionService = (ISelectionService)serviceProvider.GetService(typeof(ISelectionService));
        if (selectionService != null && selectionService.PrimarySelection is CodeActivity)
            CodeActivity codeActivityComponent = (CodeActivity)selectionService.PrimarySelection;
            CompositeActivity parentActivity = codeActivityComponent.Parent;
            if (parentActivity != null)

    return true;

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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