TextChangedEventArgs Classe

Definizione

public ref class TextChangedEventArgs : System::Windows::RoutedEventArgs

public class TextChangedEventArgs : System.Windows.RoutedEventArgs

type TextChangedEventArgs = class
    inherit RoutedEventArgs

Public Class TextChangedEventArgs
Inherits RoutedEventArgs

Ereditarietà

Object

EventArgs

RoutedEventArgs

TextChangedEventArgs

Esempio

Nell'esempio seguente viene visualizzato il numero di volte in cui il testo viene TextBox modificato. Di seguito è riportato il codice XAML per l'esempio.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    
  x:Class="SDKSample.DetectChangedTextExample"
  Title="DetectChangedText">
  <StackPanel>
    <TextBox
      Name="tbCountingChanges"    
      TextChanged="textChangedEventHandler"
      TextWrapping="Wrap">
      Here is the initial text in the textbox.  Each time the contents of this box is changed, a change counter will
      be incremented and displayed in the TextBox below.  Note that the TextChanged event is called when the TextBox
      control is initially populated with text, so the changes counter starts of at 1.
    </TextBox>
    <TextBox Name="tbCounterText">0</TextBox>
    
  </StackPanel>  
</Page>

Di seguito è indicato il code-behind per l'esempio.

using System.Windows.Controls;

namespace SDKSample
{
    public partial class DetectChangedTextExample : Page
    {
        // This is a counter for the number of times the TextChanged fires
        // for the tbCountingChanges TextBox.
        private int uiChanges = 0;

        // Event handler for TextChanged Event.
        private void textChangedEventHandler(object sender, TextChangedEventArgs args)
        {

            uiChanges++;
            if (tbCounterText != null)
            {
                tbCounterText.Text = uiChanges.ToString();
            }
        }
    }
}

Namespace SDKSample

    Partial Public Class DetectChangedTextExample
        Inherits Page

        ' This is a counter for the number of times the TextChanged fires
        ' for the tbCountingChanges TextBox.
        Private uiChanges As Integer = 0

        ' Event handler for TextChanged Event.
        Private Sub textChangedEventHandler(ByVal sender As Object,
                                            ByVal args As TextChangedEventArgs)

            uiChanges += 1
            If tbCounterText IsNot Nothing Then
                tbCounterText.Text = uiChanges.ToString()
            End If

        End Sub
    End Class
End Namespace

Costruttori

Proprietà

Metodi

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