做繁重的工作,汇报工作进展asp.net网页

Task 应该是executes,我希望任务异步执行,并将其进度报告给 File

<asp:UpdatePanel runat="server" ID="upPage">
    <ContentTemplate>
        <div class="jumbotron">
            <asp:Button runat="server" ID="BtnExecute" CssClass="btn btn-primary btn-lg" Text="Execute Heavy Task" OnClick="BtnExecute_Click" />
            <asp:Label runat="server" ID="LblStatus" Text="Ready...."/>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

代码隐藏:

public partial class _Default : Page
{
    public Progress<int> HeavyTaskProgress { get; set; }
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void BtnExecute_Click(object sender, EventArgs e)
    {
        HeavyTaskProgress = new Progress<int>();
        HeavyTaskProgress.ProgressChanged += Progress_ProgressChanged;
        Task.Run(() => DoProcessing(HeavyTaskProgress)).ContinueWith(t => ProcessingFinished(t));
        LblStatus.Text = "Task is launched.... Please wait";
    }
    private void Progress_ProgressChanged(object sender, int e)
    {
        string message = string.Format("progress at {0}%{1}", e, Environment.NewLine);
        System.IO.File.AppendAllText(@"d:\progress.txt", message);
    }
    private void DoProcessing(IProgress<int> progress)
    {
        for (int i = 0; i < 10; ++i)
        {
            Thread.Sleep(1000); // CPU-bound work
            if (progress != null)
                progress.Report(i);
        }
    }
    private void ProcessingFinished(Task t)
    {
        System.IO.File.AppendAllText(@"d:\progress.txt", "Task done !! " + t.Status);
    }
}

在 d:\progress.txt Progress_ProgressChanged 是不是坏了)。我想这可能是因为 进度\u进度已更改 和 DoProcessing 在不同的线程中执行,但我不知道如何修复它。

谢谢你的帮助。