C#多线程实例(C#反应慢时 加个进度条)

using System.Threading;

namespace Threading
{
  public partial class Form1 : Form
  {
  public Form1()
  {
  InitializeComponent();
  }
  BackgroundWorker back = null;
  Thread thread = null;
  Form2 f2 = null;
  private void button1_Click(object sender, EventArgs e)
  {
  back = new BackgroundWorker();
  back.WorkerSupportsCancellation = true;
  back.DoWork += new DoWorkEventHandler(back_DoWork);
  back.RunWorkerCompleted += new RunWorkerCompletedEventHandler(back_RunWorkerCompleted);
  back.RunWorkerAsync();

  //显示进度条 窗体
  f2 = new Form2();
  f2.BgWorker = thread;
  f2.ShowDialog();
  }

  void back_DoWork(object sender, DoWorkEventArgs e)
  {

  thread = Thread.CurrentThread;
  e.Result = Func();// 方法里面的操作;//数据查询操作写这里,就是你比较慢的操作写这里 这里最好不要出现控件
  }

  void back_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
  {
  if (e.Result != null)
  {
  if (f2 != null)
  {
  f2.Close();
  }

  if (thread != null)
  {
  thread = null;
  }
  //查询出来的数据在这里显示 ---- 显示的时候也会卡一下的
  //e.Result 转换成DoWorker事件中传过来的类型
  // MessageBox.Show(e.Result.ToString());
  }
  }

  private string Func()
  {
  string str = String.Empty;
  for (int i = 0; i < 30000; i++)
  {
  str += i.ToString();
    
  }
  return str;
  }
}

显示进度条窗体

using System.Threading;


namespace Threading
{
  public partial class Form2 : Form
  {
  public Form2()
  {
  InitializeComponent();
  }
  private Thread worker = null;

  public Thread BgWorker
  {
  get { return worker; }
  set { worker = value; }
  }

  private void Form2_Load(object sender, EventArgs e)
  {
  this.progressBar1.Style = ProgressBarStyle.Marquee; //进度条
  }


    
  private void button1_Click_1(object sender, EventArgs e)
  {
  if (worker != null)
  {
  worker.Abort(); // 结束进程
  }
  this.Close();
  }

  private void Form2_FormClosing_1(object sender, FormClosingEventArgs e)
  {
  if (worker != null)
  {
  worker.Abort();
  }
  }

  }
}