KeyPressEventArgs.Handled Eigenschaft

Definition

Ruft einen Wert ab, der angibt, ob das KeyPress-Ereignis behandelt wurde, oder legt diesen fest.Gets or sets a value indicating whether the KeyPress event was handled.

public:
 property bool Handled { bool get(); void set(bool value); };
public bool Handled { get; set; }
member this.Handled : bool with get, set
Public Property Handled As Boolean

Eigenschaftswert

true, wenn das Ereignis behandelt wurde, andernfalls false.true if the event is handled; otherwise, false.

Beispiele

Im folgenden Beispiel wird ein TextBox-Steuerelement erstellt.The following example creates a TextBox control. Die keypressed-Methode verwendet die KeyChar-Eigenschaft, um zu überprüfen, ob die EINGABETASTE gedrückt wird.The keypressed method uses the KeyChar property to check whether the ENTER key is pressed. Wenn die EINGABETASTE gedrückt wird, wird die Handled-Eigenschaft auf truefestgelegt, was darauf hinweist, dass das Ereignis behandelt wird.If the ENTER key is pressed, the Handled property is set to true, which indicates the event is handled.

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;

public ref class Form1: public Form
{
public:
   Form1()
   {
      // Create a TextBox control.
      TextBox^ tb = gcnew TextBox;
      this->Controls->Add( tb );
      tb->KeyPress += gcnew KeyPressEventHandler( this, &Form1::keypressed );
   }

private:
   void keypressed( Object^ /*o*/, KeyPressEventArgs^ e )
   {
      // The keypressed method uses the KeyChar property to check 
      // whether the ENTER key is pressed. 
      // If the ENTER key is pressed, the Handled property is set to true, 
      // to indicate the event is handled.
      if ( e->KeyChar == (char)13 )
            e->Handled = true;
   }
};

int main()
{
   Application::Run( gcnew Form1 );
}

using System;
using System.Windows.Forms;

public class Form1: Form
{
    public Form1()
    {
        // Create a TextBox control.
        TextBox tb = new TextBox();
        this.Controls.Add(tb);
        tb.KeyPress += new KeyPressEventHandler(keypressed);
    }

    private void keypressed(Object o, KeyPressEventArgs e)
    {
        // The keypressed method uses the KeyChar property to check 
        // whether the ENTER key is pressed. 

        // If the ENTER key is pressed, the Handled property is set to true, 
        // to indicate the event is handled.
        if (e.KeyChar == (char)Keys.Return)
        {
            e.Handled = true;
        }
    }

    public static void Main()
    {
        Application.Run(new Form1());
    }
}
Imports System.Windows.Forms

Public Class Form1
    Inherits Form

    Public Sub New()
        ' Create a TextBox control.
        Dim tb As New TextBox()
        Me.Controls.Add(tb)
        AddHandler tb.KeyPress, AddressOf keypressed
    End Sub

    Private Sub keypressed(ByVal o As [Object], ByVal e As KeyPressEventArgs)
        ' The keypressed method uses the KeyChar property to check 
        ' whether the ENTER key is pressed. 

        ' If the ENTER key is pressed, the Handled property is set to true, 
        ' to indicate the event is handled.

        If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
            e.Handled = True
        End If
    End Sub

    Public Shared Sub Main()
        Application.Run(New Form1())
    End Sub
End Class

Hinweise

Wenn das Ereignis nicht behandelt wird, wird es zur Standard Verarbeitung an das Betriebssystem gesendet.If the event is not handled, it will be sent to the operating system for default processing. Legen Sie Handled auf true fest, um das KeyPress Ereignis abzubrechen.Set Handled to true to cancel the KeyPress event.

Gilt für:

Siehe auch