【C#利用后台动态加载数据】Winform“防界面卡死”【BackgroundWorker】类

using System.ComponentModel

直接使用EgProgressBar方法

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  BackgroundWorker Bw = new BackgroundWorker();
  ListView listView1 = new ListView();
  public void EgProgressBar()
  {
      DirectoryInfo di = new DirectoryInfo(@"C:/Windows");
      FileInfo[] fi = di.GetFiles();
      progressBar1.Maximum = fi.Length - 1; //设置进度条的最大值
      Bw.WorkerSupportsCancellation = true;
      Bw.WorkerReportsProgress = true;
      Bw.DoWork += new DoWorkEventHandler(Add); //绑定事件
      Bw.ProgressChanged += new ProgressChangedEventHandler(Progress);
      Bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(End);
      Bw.RunWorkerAsync();
  }
  public void Add(object sender, DoWorkEventArgs e)
  {
       
      DirectoryInfo di = new DirectoryInfo(@"C:/Windows");
      foreach (FileInfo item in di.GetFiles())
      {
          ListViewItem lvt = new ListViewItem();//用listviewItem来存储获取到文件的信息
          lvt.Text = item.FullName;
          lvt.SubItems.Add(DateTime.Now.ToLongTimeString());
          Thread.Sleep(500);
          
          Bw.ReportProgress(listView1.Items.Count, lvt);//把当前的进度报告出去，获取到第几个文件和该文件的信息
      }
 
  }
  public void Progress(object sender, ProgressChangedEventArgs e)
  {
      progressBar1.Value = e.ProgressPercentage;//获取第几个文件，用来改变进度条的进度
      ListViewItem lv = e.UserState as ListViewItem;
      listView1.Items.Add(lv);//把最新获取到的文件信息添加到listview
  }
  public void End(object sender, RunWorkerCompletedEventArgs e)
  {
       progressBar1.Value = 0;//进度条清0
  }

传递方法参数RunWorkerAsync（参数）

获取方法   DoWorkEventArgs    的    e.Argument

 结束时判定 Dowork方法  e.result   自动​传递到completed 的e.result 中





posted @ 2015-10-28 23:29  月渊  阅读(909)  评论(0)  编辑  收藏  举报