KeyPressEventArgs.Handled Properti

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Mendapatkan atau menetapkan nilai yang menunjukkan apakah KeyPress peristiwa ditangani.

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

Nilai Properti

Boolean

true jika peristiwa ditangani; jika tidak, false.

Contoh

Contoh berikut membuat TextBox kontrol. Metode keypressed ini menggunakan KeyChar properti untuk memeriksa apakah tombol ENTER ditekan. Jika tombol ENTER ditekan, Handled properti diatur ke true, yang menunjukkan peristiwa ditangani.

#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

Keterangan

Jika peristiwa tidak ditangani, peristiwa akan dikirim ke sistem operasi untuk pemrosesan default. Atur HandledKeyPress ke true untuk membatalkan acara.

Lihat juga

• KeyPress