Question

我想同步调用后台工作程序。我希望执行代码在backgroundworker完成执行时结束。我的BackgroundWorker代码在这里：

{
    BackgroundWorker worker = new BackgroundWorker();
    worker.DoWork += DoWork;
    worker.RunWorkerCompleted += RunWorkerCompleted;
    ...
    worker.RunWorkerAsync();
    //wait for execution to end 
}

这样做的一种方法是再次检查状态，直到执行完成，但还有其他好办法吗？

Answer 1

如果您不希望代码异步执行，请不要将其放在BackgroundWorker ...

中

{ 
    DoWork();
}

但是，如果您确实需要在BackgroundWorker中使用代码，有一些不明原因，您可以使用以下内容：

ManualResetEvent mre = new ManualResetEvent(false);
BackgroundWorker worker = new BackgroundWorker(); 
worker.DoWork += DoWork; 
worker.RunWorkerCompleted += (s, e) => 
                             {
                                 RunWorkerCompleted(s, e); 
                                 mre.Set();
                             };
// ... 
worker.RunWorkerAsync();
mre.WaitOne();

Answer 2

目标： BackgroundWorker应该同步执行。

创建了一个Windows应用程序表单。单击button1时，它应同步执行BackgroundWorker 并且返回参与UI，因此用户在完成BackgroundWorker任务之前无法执行任何操作。

public partial class Form1 : Form 
{ 

    public Form1() 
    { 
        InitializeComponent(); 
    }

    BGimplent obj = null;

    private void button1_Click(object sender, EventArgs e)
    {
        int i = 0;
         obj = new BGimplent();
        obj.eveBG += obj_eveBG;
        i = 5;
        obj.MyProperty = 5;
        obj.DoConfig();
        obj.ManualReset.WaitOne();

        obj.MyProperty = 10;
        obj.MyProperty = 11;
        obj.MyProperty = 12;
        obj.MyProperty = 13;

        obj.MyProperty = 14;
    }

    void obj_eveBG(string s)
    {
        obj.ManualReset.Set();
        MessageBox.Show(s);
    }
}



/*
*******************************************************
    Paste below code in adding new class i.e. Class1


*/
public delegate void delBG(string s);

class BGimplent
{
    public event  delBG eveBG;


    private ManualResetEvent mnuReset = new ManualResetEvent(false);
    public ManualResetEvent ManualReset { get; set; }

    public int MyProperty { get; set; }

    BackgroundWorker bgWorker = new BackgroundWorker();
    public void DoConfig()
    {
        ManualReset = mnuReset;

        bgWorker.DoWork += bgWorker_DoWork;
        bgWorker.ProgressChanged += bgWorker_ProgressChanged;
        bgWorker.RunWorkerCompleted += bgWorker_RunWorkerCompleted;
        bgWorker.RunWorkerAsync();            
    }

    void bgWorker_DoWork(object sender, DoWorkEventArgs e)
    {   
        Thread.Sleep(5000);
        if (eveBG != null)
            eveBG("Value of MyProperty: " + MyProperty.ToString());
    }

}

Answer 3

//wait for execution to end之后的代码应放在worker_RunWorkerCompleted方法中。

同步调用BackgroundWorker

3 个答案: