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如何等待BackgroundWorker完成并退出控制台应用程序

backgroundworker multithreading .net c#

Soham Dasgupta · 技术社区 · 14 年前

class Program
{
    private static BackgroundWorker worker = new BackgroundWorker();
    private event EventHandler BackgroundWorkFinished;

    static void Main(string[] args)
    {
        worker.DoWork += worker_DoWork;
        worker.RunWorkerCompleted += worker_RunWorkerCompleted;
        worker.ProgressChanged += worker_ProgressChanged;
        worker.WorkerReportsProgress = true;
        worker.WorkerSupportsCancellation = true;

        Console.WriteLine("Starting Application...");

        worker.RunWorkerAsync();
        Console.ReadKey();
    }

    static void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        Console.WriteLine(e.ProgressPercentage.ToString());
    }

    static void worker_DoWork(object sender, DoWorkEventArgs e)
    {
        Console.WriteLine("Starting to do some work now...");
        int i;
        for (i = 1; i < 10; i++)
        {
            Thread.Sleep(1000);
            worker.ReportProgress(Convert.ToInt32((100.0 * i) / 10));
        }

        e.Result = i;
    }

    static void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        Console.WriteLine("Value Of i = " + e.Result.ToString());
        Console.WriteLine("Done now...");
    }
}

3 回复 | 直到 14 年前

Community Fabien Hure 7 年前

看到了吗 How to wait for a BackgroundWorker to cancel? 关于如何在后台工作人员和主线程之间进行通信的帖子。

基本上,您必须使用在DoWork结束时设置的事件来表示DoWork已经完成。然后在主线程中对该事件执行WaitOne()。

Henk Holterman 10 年前

控制台应用程序不是使用或测试Bgw的正确位置。你会得到奇怪的结果。在关键点处打印ManagedThreadId以查看发生了什么。

还有一些标准建议:你的 worker_RunWorkerCompleted() 应该检查一下 e.Error ~~现在它就像有一个空的 catch{} 阻止。~~
e.Result ,处理起来更复杂。

Manos Nikolaidis Airsource Ltd 9 年前

console.readkey() 不起作用。应用程序没有等待 ReadKey() 功能。

class Program
{
    private static BackgroundWorker worker = new System.ComponentModel.BackgroundWorker();
    private static AutoResetEvent resetEvent = new AutoResetEvent(false);
    static void Main(string[] args)
    {
        worker.DoWork += worker_DoWork;
        worker.RunWorkerCompleted += worker_RunWorkerCompleted;
        worker.ProgressChanged += worker_ProgressChanged;
        worker.WorkerReportsProgress = true;

        Console.WriteLine("Starting Application...");

        worker.RunWorkerAsync();
        resetEvent.WaitOne();

        Console.ReadKey();
    }

    static void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        Console.WriteLine(e.ProgressPercentage.ToString());
    }

    static void worker_DoWork(object sender, DoWorkEventArgs e)
    {
        Console.WriteLine("Starting to do some work now...");
        int i;
        for (i = 1; i < 10; i++)
        {
            Thread.Sleep(1000);
            worker.ReportProgress(Convert.ToInt32((100.0 * i) / 10));
        }

        e.Result = i;

        resetEvent.Set();
    }

    static void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        Console.WriteLine("Value Of i = " + e.Result.ToString());
        Console.WriteLine("Done now...");
    }

}

修正编辑: resetEvent.Set() 到里面去嫁妆 Runworker已完成 . 这个 完整的 永远不会调用事件处理程序,因为主线程正在等待事件。