BackgroundWorker.ProgressChanged 事件

public:
 event System::ComponentModel::ProgressChangedEventHandler ^ ProgressChanged;

public event System.ComponentModel.ProgressChangedEventHandler ProgressChanged;

public event System.ComponentModel.ProgressChangedEventHandler? ProgressChanged;

member this.ProgressChanged : System.ComponentModel.ProgressChangedEventHandler 

Public Custom Event ProgressChanged As ProgressChangedEventHandler 

事件类型

示例

下面的代码示例演示如何使用该 ProgressChanged 事件向用户报告异步操作的进度。 该代码示例是 BackgroundWorker 类中的一个较大示例的一部分。

// This event handler updates the progress bar.
void backgroundWorker1_ProgressChanged( Object^ /*sender*/, ProgressChangedEventArgs^ e )
{
   this->progressBar1->Value = e->ProgressPercentage;
}

// This event handler updates the progress bar.
void backgroundWorker1_ProgressChanged(object sender,
    ProgressChangedEventArgs e) => progressBar1.Value = e.ProgressPercentage;

' This event handler updates the progress bar.
Private Sub backgroundWorker1_ProgressChanged(
ByVal sender As Object, ByVal e As ProgressChangedEventArgs) _
Handles backgroundWorker1.ProgressChanged

    progressBar1.Value = e.ProgressPercentage

End Sub

注解

调用该方法时将引发此 ReportProgress 事件。

有关如何处理事件的详细信息，请参阅 处理和引发事件。

另请参阅

• 操作方法：在后台运行操作
• 如何：在后台下载文件