Question

我在一个解决方案中有两个项目。一个是形式（exe），一个是类（dll）。

我有一个这样的背景工作者（在表单项目中）：

private void CalculateBackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{          
        try
        {
            BackgroundWorker worker = sender as BackgroundWorker;

            if (worker.CancellationPending == true)
            {
                e.Cancel = true;
            }
            else
            {
                Grav_Fluid.Rule.Processing_Controller.SpectralAnalysisFormController spectralAnalysisFormController = new Grav_Fluid.Rule.Processing_Controller.SpectralAnalysisFormController();
                outputDataTable = spectralAnalysisFormController.Proccess(inputDataTable, double.Parse(DistanceIntervalTextBox.Text), worker);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

这是课堂项目（dll）中发生的事情：

public DataTable Proccess(DataTable inputDataTable, double ITV, System.ComponentModel.BackgroundWorker backgroundWorker)
    {
        try
        {
            int RowCount = inputDataTable.Rows.Count;

            int orde = 7;
            int dataCount = inputDataTable.Rows.Count;
            double[] coef = new double[orde + 3];
            double[] distance = new double[dataCount];
            ...
            ...
            for(int i=0; i<newDataCount; i++)
            {
                ...
                backgroundWorker.ReportProgress(Convert.ToInt32(i * 80 / newDataCount));
            }
            return dT;
        }
        catch (Exception ex)
        {

            throw ex;
        }
    }

我的问题是，如何取消我的背景工作者的好方法？我只想移动这段代码：

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

到班级项目，所以我可以立即停止这个过程。但我不能这样做。任何人都可以帮助我吗？

================================

更新取消本身来自其他功能：

    private void buttonCancel_Click(object sender, EventArgs e)
    {
        if (CalculateBackgroundWorker.WorkerSupportsCancellation == true)
        {
            CalculateBackgroundWorker.CancelAsync();
            LoaderForm.Close();
        }
    }

    private void CalculateButton_Click(object sender, EventArgs e)
    {
        try
        {
            ClearOutputDataTable();
            if (CalculateBackgroundWorker.IsBusy != true)
            {
                LoaderForm = new General.LoaderForm();
                LoaderForm.Canceled += new EventHandler<EventArgs>(buttonCancel_Click);
                LoaderForm.Show();
                LoaderForm.TopMost = true;
                CalculateBackgroundWorker.RunWorkerAsync();
            }
        }
        catch (Exception ex)
        {
              Messagebox.Show(ex.Message);
        }
    }

我更新了我的问题。所以我有加载表单显示进度条。它会在计算过程中出现。此表单具有取消按钮，将执行以取消该过程。

这是loaderform背后的代码：

public partial class LoaderForm : Form
{
    public LoaderForm()
    {
        InitializeComponent();
    }

    public string Message
    {
        set { PercentageLabel.Text = value; }
    }

    public int ProgressValue
    {
        set { LoadProgressBar.Value = value; }
    }

    public event EventHandler<EventArgs> Canceled;

    private void CancelButton_Click(object sender, EventArgs e)
    {
        EventHandler<EventArgs> ea = Canceled;
        if (ea != null)
            ea(this, e);
    }
}

更新2： 即使我称之为cancellAsync，过程也会一直持续到完成。 BackgroundWorker_DoWork中的代码只能在这种情况下工作（示例）：

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;

        for (int i = 1; i <= 10; i++)
        {
            if (worker.CancellationPending == true)
            {
                e.Cancel = true;
                break;
            }
            else
            {
                // Perform a time consuming operation and report progress.
                worker.ReportProgress(i * 10);
                System.Threading.Thread.Sleep(500);
            }
        }
    }

Answer 1

您应该检查Process方法中的BackgroundWorker.CancellationRequies并在检测到取消时退出

for(int i=0; i<newDataCount; i++)
{
  if(backgroundWorker.CancellationPending)
  {
    return;
  }

从其他项目中停止后台工作程序

1 个答案: