C#使用后台线程BackgroundWorker处理任务的总结

private BackgroundWorker worker = new BackgroundWorker();

public partial class MainFrame : BaseForm
  {
    /// <summary>
    /// 增加一个变量来记录线程状态
    /// </summary>
    private bool IsThreadRunning = false;
    private BackgroundWorker worker = new BackgroundWorker();

    public MainFrame()
    {
      InitializeComponent();

      Portal.gc.InitData();

      worker.WorkerSupportsCancellation = true;  //支持取消
      worker.WorkerReportsProgress = true;    //支持报告进度
      worker.DoWork += worker_DoWork;       //处理过程
      worker.RunWorkerCompleted += worker_RunWorkerCompleted; //完成操作
      worker.ProgressChanged += worker_ProgressChanged;    //报告进度
    }

/// <summary>
    /// 进度条的通知
    /// </summary>
    void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
      this.barProgress.EditValue = e.ProgressPercentage;
      CollectStateInfo stateInfo = e.UserState as CollectStateInfo;
      if (stateInfo != null)
      {
        var message = string.Format("正在采集 {0} 的 {1} , 项目名称为:{2}", stateInfo.TotalRecords, stateInfo.CompletedRecord + 1, stateInfo.CurrentItemName);
        this.lblTips.Text = message;
        this.barTips.Caption = message;

        //记录运行位置
        JobParameterHelper.SaveData(new CurrentJobParameter(stateInfo));
      }
    }

/// <summary>
  /// 状态对象数据
  /// </summary>
  public class CollectStateInfo
  {
    /// <summary>
    /// 当前期数(年份+期数)
    /// </summary>
    public string YearQSNumber { get; set; }

    /// <summary>
    /// 任务开始时间
    /// </summary>
    public DateTime StartTime { get; set; }

    private DateTime m_EndTime = DateTime.Now;

    /// <summary>
    /// 任务开始时间
    /// </summary>
    public DateTime EndTime
    {
      get
      {
        return m_EndTime;
      }
      set
      {
        //设置结束时间的时候，获取耗时
        m_EndTime = value;
        this.TimeSpanUsed = value.Subtract(this.StartTime);
      }
    }

    /// <summary>
    /// 任务用时
    /// </summary>
    public TimeSpan TimeSpanUsed { get; set; }

    /// <summary>
    /// 任务数量
    /// </summary>
    public int TotalRecords { get; set; }

    private int m_CompletedRecord = 0;

    /// <summary>
    /// 完成数量
    /// </summary>
    public int CompletedRecord
    {
      get
      {
        return m_CompletedRecord;
      }
      set
      {
        m_CompletedRecord = value;
        if (TotalRecords > 0)
        {
          this.CurrentProgress = Convert.ToInt32(value * 100.0 / TotalRecords);
        }
      }
    }

    /// <summary>
    /// 当前进度
    /// </summary>
    public int CurrentProgress { get; set; }

    /// <summary>
    /// 当前采集的项目
    /// </summary>
    public string CurrentItemName { get; set; }

    /// <summary>
    /// 默认构造函数
    /// </summary>
    /// <param name="total"></param>
    public CollectStateInfo()
    {
      this.StartTime = DateTime.Now;
      this.EndTime = DateTime.Now;
    }

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="total">任务数量</param>
    /// <param name="qsNumber">采集当前期数</param>
    public CollectStateInfo(int total, string qsNumber, int completed) :this()
    {
      this.TotalRecords = total;
      this.YearQSNumber = qsNumber;
      this.CompletedRecord = completed;
    }

  }

void worker_DoWork(object sender, DoWorkEventArgs e)
    {
      CollectStateInfo info = e.Argument as CollectStateInfo;
      if (info != null)
      {
        LinkJob job = new LinkJob();
        var stateInfo = job.Execute(this.worker, info);
        e.Result = stateInfo;
      }
    }

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
      //还原按钮状态
      InitCollectState();
      IsThreadRunning = false;

      string message = "采集操作完成";
      CollectStateInfo stateInfo = e.Result as CollectStateInfo;
      if (stateInfo != null && stateInfo.CompletedRecord == stateInfo.TotalRecords)
      {
        message += string.Format("，完成采集网址{0}个,耗时为：{1}分钟{2}秒。", stateInfo.TotalRecords, stateInfo.TimeSpanUsed.Minutes, stateInfo.TimeSpanUsed.Seconds);

        //清空数据即可
        JobParameterHelper.ClearData();
      }
      else
      {
        message += string.Format("，用户取消处理,耗时为：{1}分钟{2}秒。", stateInfo.TotalRecords, stateInfo.TimeSpanUsed.Minutes, stateInfo.TimeSpanUsed.Seconds);
      }
      MessageDxUtil.ShowTips(message);
    }

if (!worker.IsBusy)
        {
          this.btnStartCollect.ImageOptions.Image = Resources.Button_Stop;
          this.lblTips.Text = "数据采集中....，单击按钮可停止采集";
          this.btnStartCollect.Text = "停止采集";

          var totalCount = BLLFactory<URLLink>.Instance.GetRecordCount();//数量为总数
          var stateInfo = new CollectStateInfo(totalCount, yearQSNumber, skipCount);

          worker.RunWorkerAsync(stateInfo);
          //改变状态
          IsThreadRunning = !IsThreadRunning;
        }

if (MessageDxUtil.ShowYesNoAndWarning("采集正在进行中，您确认停止采集吗？") == System.Windows.Forms.DialogResult.Yes)
        {
          worker.CancelAsync();

          //改变状态
          IsThreadRunning = !IsThreadRunning;

          //还原按钮状态
          InitCollectState();
        }