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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)

public delegate void TextChangedEventHandler(
	Object sender,
	TextChangedEventArgs e
)

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 void textChangedEventHandler(object sender, TextChangedEventArgs args)
{    
    // Omitted Code: Insert code that does something whenever
    // the text changes...
} // end textChangedEventHandler


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

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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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