Question

如何在c＃中指定时间后取消后台工作程序或取消不响应后台工作程序。

Answer 1

查看本教程：http://www.albahari.com/threading/part3.aspx

为了使System.ComponentModel.BackgroundWorker线程支持取消，您需要在启动线程之前将WorkerSupportsCancellation属性设置为True。

然后，您可以调用BackgroundWorker的.CancelAsync方法来取消该线程。

Answer 2

BackgroundWorker不支持这两种情况。以下是支持这些案例的一些代码的开头。

class MyBackgroundWorker :BackgroundWorker {
    public MyBackgroundWorker() {
        WorkerReportsProgress = true;
        WorkerSupportsCancellation = true;
    }

    protected override void OnDoWork( DoWorkEventArgs e ) {
        var thread = Thread.CurrentThread;
        using( var cancelTimeout = new System.Threading.Timer( o => CancelAsync(), null, TimeSpan.FromMinutes( 1 ), TimeSpan.Zero ) )
        using( var abortTimeout = new System.Threading.Timer( o => thread.Abort(), null, TimeSpan.FromMinutes( 2 ), TimeSpan.Zero ) ) {
            for( int i = 0; i <= 100; i += 20 ) {
                ReportProgress( i );

                if( CancellationPending ) {
                    e.Cancel = true;
                    return;
                }

                Thread.Sleep( 1000 ); //do work
            }
            e.Result = "My Result";  //report result

            base.OnDoWork( e );
        }
    }
}

如何在c＃中指定的时间后取消后台工作程序

2 个答案: