如何在wpf中同步多个后台工作者类？

Question

我已经实现了类似于以下示例的后台工作人员类，并且我想在每次后台工作人员完成时更新我的​​ UI。

          for (int i = 1; i < 10; i++)
            {
                BackgroundWorker worker = new BackgroundWorker();
                worker.DoWork += new DoWorkEventHandler(Worker_DoWork);
                worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(Worker_RunWorkerCompleted);
                worker.RunWorkerAsync(i);

                while (worker.IsBusy == true)
                {
                   Thread.Sleep(100);
                }
            }

Worker_DoWork 返回数据行和 Worker_RunWorkerCompleted 正在将返回的结果添加到数据网格。但该函数永远不会以正确的顺序到达 Worker_RunWorkerCompleted。我怎么能解决这个问题？

编辑：

为了清楚起见，我正在更新更多细节。

 <my:DataGrid x:Name="theGrid" RowHeight="30" ItemsSource="{Binding Category}" AutoGenerateColumns="True" HeadersVisibility="All" Margin="235,96.5,84,65.5">
            <my:DataGrid.RowDetailsTemplate>
                <DataTemplate>
                    <Expander>
                        <my:DataGrid Height="300" ItemsSource="{Binding Products}" AutoGenerateColumns="True" HeadersVisibility="Column"> </my:DataGrid>
                    </Expander>
                </DataTemplate>
            </my:DataGrid.RowDetailsTemplate>
        </my:DataGrid>


    //List of objects
    List<Category> Categories = new List<Category>();

    private void button1_Click(object sender, RoutedEventArgs e)
    {      
        for (int i = 1; i < 10; i++)
        {
            BackgroundWorker worker = new BackgroundWorker();

            worker.DoWork += new DoWorkEventHandler(Worker_DoWork);
            worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(Worker_RunWorkerCompleted);
            worker.RunWorkerAsync(i);

            while (worker.IsBusy == true)
            {
                Thread.Sleep(100);
            }
        }
    }

    void Worker_DoWork(object sender, DoWorkEventArgs e)
    {
        long i = Convert.ToInt64(e.Argument);
        Category cat = new Category { CategoryID = i, Name = "Category" + i };
        cat.Products = new List<Product>();

        for (long j = 1; j < 10; j++)
        {
            Product p = new Product { ProductID = (i * j), Name = "Product " + (i * j).ToString() };
            cat.Products.Add(p);
        }

        e.Result = cat;
    }

    void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        Category cat = ((Category)e.Result);
        Categories.Add(cat);
        theGrid.ItemsSource = Categories;
    }
}

public class Product
{
    public long ProductID { get; set; }
    public string Name { get; set; }
}

public class Category
{
    public long CategoryID { get; set; }
    public string Name { get; set; }
    public List<Product> Products { get; set; }
}

Answer 1

您仍然在阻塞 UI 线程 - 在您的所有 BackgroundWorkers 完成之前，它不会处理事件。这违背了整点的BackgroundWorker。你应该开始它们，然后让它们完成。如果您需要在完成后进行一些其他更改，您应该在处理程序中执行此操作RunWorkerCompleted- 可能会记录已完成的数量（如果您并行启动它们）或者如果您想运行它们，则开始一个新的连续运行，直到运行完所有要运行的程序。