using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace Monitor.Class
{
  /// <summary>
  /// 异步操作
  /// </summary>
  public class CWorker
  {
    /// <summary>
    /// 对象
    /// </summary>
    private BackgroundWorker backgroundWorker;

    /// <summary>
    /// 后台执行的操作
    /// </summary>
    public Action BackgroundWork { get; set; }

    /// <summary>
    /// 后台任务执行完毕后事件
    /// </summary>
    public event EventHandler<BackgroundWorkerEventArgs> BackgroundWorkerCompleted;

    private BackgroundWorkerEventArgs _eventArgs;//异常参数

    /// <summary>
    /// 构造
    /// </summary>
    public CWorker()
    {
      _eventArgs = new BackgroundWorkerEventArgs();
      backgroundWorker = new BackgroundWorker();
      backgroundWorker.WorkerReportsProgress = true;
      backgroundWorker.WorkerSupportsCancellation = true;
      backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
      backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
    }

    /// <summary>
    /// 开始工作
    /// </summary>
    public void BegionWork()
    {
      if (backgroundWorker.IsBusy)
        return;
      backgroundWorker.RunWorkerAsync();
    }

    /// <summary>
    /// 工作
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
      if (BackgroundWork != null)
      {
        try
        {
          BackgroundWork();
        }
        catch (Exception ex)
        {
          _eventArgs.BackGroundException = ex;
        }
      }
    }

    /// <summary>
    /// 完成
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
      if (this.BackgroundWorkerCompleted != null)
      {
        this.BackgroundWorkerCompleted(null, _eventArgs);
      }
    }
  }

  /// <summary>
  /// 事件
  /// </summary>
  public class BackgroundWorkerEventArgs : EventArgs
  {
    /// <summary>
    /// 后台程序运行时抛出的异常
    /// </summary>
    public Exception BackGroundException { get; set; }
  }
}