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TextChangedEventHandler Delegate

Represents the method that will handle the TextBoxBase.TextChanged  routed event.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

'Declaration
Public Delegate Sub TextChangedEventHandler ( _
	sender As Object, _
	e As TextChangedEventArgs _
)
'Usage
Dim instance As New TextChangedEventHandler(AddressOf HandlerMethod)
In XAML, you can use delegates but you cannot define your own.

Parameters

sender
Type: System.Object

The object where the event handler is attached.

e
Type: System.Windows.Controls.TextChangedEventArgs

The event data.

This example shows one way to use the TextChanged event to execute a method whenever the text in a TextBox control has changed.

In the code-behind class for the XAML that contains the TextBox control that you want to monitor for changes, insert a method to call whenever the TextChanged event fires. This method must have a signature that matches what is expected by the TextChangedEventHandler delegate.

The event handler is called whenever the contents of the TextBox control are changed, either by a user or programmatically.

Note: This event fires when the TextBox control is created and initially populated with text.

In the Extensible Application Markup Language (XAML) that defines your TextBox control, specify the TextChanged attribute with a value that matches the event handler method name.

<TextBox  TextChanged="textChangedEventHandler">
  Here is the initial text in my TextBox.  Each time the contents of this TextBox are changed, 
  the TextChanged event  fires and textChangedEventHandler is called.
</TextBox>

In the code-behind class for the XAML that contains the TextBox control that you want to monitor for changes, insert a method to call whenever the TextChanged event fires. This method must have a signature that matches what is expected by the TextChangedEventHandler delegate.

' TextChangedEventHandler delegate method. 
Private Sub textChangedEventHandler(ByVal sender As Object, ByVal args As TextChangedEventArgs)
    ' Omitted Code: Insert code that does something whenever 
    ' the text changes... 
End Sub

The event handler is called whenever the contents of the TextBox control are changed, either by a user or programmatically.

Note: This event fires when the TextBox control is created and initially populated with text.

Comments

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
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