AutoCompleteBox.OnKeyDown Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Provides handling for the KeyDown event.
Namespace: System.Windows.Controls
Assembly: System.Windows.Controls.Input (in System.Windows.Controls.Input.dll)
Syntax
'Declaration
Protected Overrides Sub OnKeyDown ( _
e As KeyEventArgs _
)
protected override void OnKeyDown(
KeyEventArgs e
)
Parameters
- e
Type: System.Windows.Input.KeyEventArgs
A KeyEventArgs that contains the event data.
Remarks
The OnKeyDown method is called before any event handler for the KeyDown event is called. This method allows derived classes to handle the KeyDown event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
This implementation sets the KeyEventArgs.Handled property of the event data to true in the following situations:
The IsDropDownOpen property is true, the SelectionAdapter property is nulla null reference (Nothing in Visual Basic), and the Enter, Escape, or F4 key is pressed. If a SelectionAdapter is specified, this method passes key handling to the HandleKeyDown method of the SelectionAdapter.
-or-
The IsDropDownOpen property is false and the Down, Escape, or F4 key is pressed.
Notes to Inheritors
If you override OnKeyDown, you can prevent registered delegates from receiving events by setting KeyEventArgs.Handled to true. For more information about routed events and the KeyEventArgs.Handled property, see Events Overview for Silverlight.
Version Information
Silverlight
Supported in: 5, 4, 3
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.