DoWorkEventArgs 类

定义

public ref class DoWorkEventArgs : EventArgs

public ref class DoWorkEventArgs : System::ComponentModel::CancelEventArgs

public class DoWorkEventArgs : EventArgs

public class DoWorkEventArgs : System.ComponentModel.CancelEventArgs

type DoWorkEventArgs = class
    inherit EventArgs

type DoWorkEventArgs = class
    inherit CancelEventArgs

Public Class DoWorkEventArgs
Inherits EventArgs

Public Class DoWorkEventArgs
Inherits CancelEventArgs

继承

Object

EventArgs

DoWorkEventArgs

继承

Object

EventArgs

CancelEventArgs

DoWorkEventArgs

示例

下面的代码示例演示如何使用 DoWorkEventArgs 类来处理 DoWork 事件。 有关完整代码列表，请参阅 如何：在后台运行操作。

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

构造函数

属性

方法

适用于

另请参阅

• BackgroundWorker
• 如何：在后台运行操作