DoWorkEventArgs.Argument Properti

Definisi

Ruang nama:

System.ComponentModel

Rakitan:

System.ComponentModel.EventBasedAsync.dll

Sumber:

DoWorkEvent.cs

Mendapatkan nilai yang mewakili argumen operasi asinkron.

public:
 property System::Object ^ Argument { System::Object ^ get(); };

public object? Argument { get; }

member this.Argument : obj

Public ReadOnly Property Argument As Object

Nilai Properti

Object

Mewakili Object argumen operasi asinkron.

Contoh

Contoh kode berikut menunjukkan cara menggunakan DoWorkEventArgs kelas untuk menangani DoWork peristiwa. Untuk daftar kode lengkap, lihat Cara: Menjalankan Operasi di Latar Belakang.

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    // Do not access the form's BackgroundWorker reference directly.
    // Instead, use the reference provided by the sender parameter.
    BackgroundWorker bw = sender as BackgroundWorker;

    // Extract the argument.
    int arg = (int)e.Argument;

    // Start the time-consuming operation.
    e.Result = TimeConsumingOperation(bw, arg);

    // If the operation was canceled by the user, 
    // set the DoWorkEventArgs.Cancel property to true.
    if (bw.CancellationPending)
    {
        e.Cancel = true;
    }
}

Private Sub backgroundWorker1_DoWork( _
sender As Object, e As DoWorkEventArgs) _
Handles backgroundWorker1.DoWork

   ' Do not access the form's BackgroundWorker reference directly.
   ' Instead, use the reference provided by the sender parameter.
   Dim bw As BackgroundWorker = CType( sender, BackgroundWorker )
   
   ' Extract the argument.
   Dim arg As Integer = Fix(e.Argument)
   
   ' Start the time-consuming operation.
   e.Result = TimeConsumingOperation(bw, arg)
   
   ' If the operation was canceled by the user, 
   ' set the DoWorkEventArgs.Cancel property to true.
   If bw.CancellationPending Then
      e.Cancel = True
   End If

End Sub

Lihat juga

• BackgroundWorker
• Cara: Menjalankan Operasi di Latar Belakang