Como: Detectar quando o texto em uma TextBox foi alterado
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: Este evento é acionado quando o TextBox controle é criado e inicialmente preenchida com texto.
Exemplo
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
// 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: Este evento é acionado quando o TextBox controle é criado e inicialmente preenchida com texto.
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