Andy (Steve) De George
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title, description, ms.date, ms.custom, dev_langs, helpviewer_keywords, ms.assetid
| title | description | ms.date | ms.custom | dev_langs | helpviewer_keywords | ms.assetid | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| How to: Detect When Text in a TextBox Has Changed | Learn how to use the TextChanged event to run a method whenever the text in a TextBox control changes in a Windows Presentation Foundation application. | 03/30/2017 | devdivchpfy22 |
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1c39ee14-e37f-49fb-a0d1-a9824ca13584 |
How to: Detect When Text in a TextBox Has Changed
This example shows one way to use the xref:System.Windows.Controls.Primitives.TextBoxBase.TextChanged event to execute a method whenever the text in a xref:System.Windows.Controls.TextBox control has changed.
In the code-behind class for the XAML that contains the xref:System.Windows.Controls.TextBox control that you want to monitor for changes, insert a method to call whenever the xref:System.Windows.Controls.Primitives.TextBoxBase.TextChanged event fires. This method must have a signature that matches what is expected by the xref:System.Windows.Controls.TextChangedEventHandler delegate.
The event handler is called whenever the contents of the xref:System.Windows.Controls.TextBox control are changed, either by a user or programmatically.
Note
This event fires when the xref:System.Windows.Controls.TextBox control is created and initially populated with text.
Define TextBox control
In the Extensible Application Markup Language (XAML) that defines your xref:System.Windows.Controls.TextBox control, specify the xref:System.Windows.Controls.Primitives.TextBoxBase.TextChanged attribute with a value that matches the event handler method name.
[!code-xamlTextBox_MiscCode#_TextChangedXAML]
Monitor the TextBox control changes
In the code-behind class for the XAML that contains the xref:System.Windows.Controls.TextBox control that you want to monitor for changes, insert a method to call whenever the xref:System.Windows.Controls.Primitives.TextBoxBase.TextChanged event fires. This method must have a signature that matches what is expected by the xref:System.Windows.Controls.TextChangedEventHandler delegate.
[!code-csharpTextBox_MiscCode#_TextChangedEventHandler] [!code-vbTextBox_MiscCode#_TextChangedEventHandler]
The event handler is called whenever the contents of the xref:System.Windows.Controls.TextBox control are changed, either by a user or programmatically.
Note
This event fires when the xref:System.Windows.Controls.TextBox control is created and initially populated with text.
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