多线程的使用（三）

//不带参数的多线程调用方法；
private void DoSomeThing()
{
  MessageBox.Show("Thread Start");
}
private void DoWork()
{
  Thread t=new Thread(new ThreadStart(this.DoSomeThing));
  t.Start();
}

//带参数的多线程调用方法；
private void DoSomeThing(object o)
{
  MessageBox.Show(o.ToString());
}
private void DoWork()
{
  Thread t=new Thread(new ParameterizedThreadStart(DoSomeThing));
  t.Start("JFJEJFNEJ");
}
//众所周知，新开一个线程代价是很高昂的，如果我们每个操作都新开一个线程，那么太浪费了，于是，下面使用线程池。
无参数传递：
private void DoWork()
{
  ThreadPool.QueueUserWorkItem(new WaitCallback(this.DoSomeThing));
}
private void DoSomeThing()
{
  Messagebox.Show("Thread无参数传递!")
}
//有参数传递

private void DoWork()
{
  ThreadPool.QueueUserWorkItem(new WaitCallBack(this.DoSomeThing),"线程池的参数");
}
private void DoSomeThing(object o)
{
  messagebox.show(o.tostring());
}

//使用匿名方法更灵活
private void DoWork()
{
  string name="guodiegang";
  ThreadPool.QueueUserWorkItem(new WaitCallback(delegate(object o){
  MessageBox.Show(name);
  }));
}

//如果Invoke调用主窗体之后，还希望在调用完后得到一个返回值：
private void DoWork()
{
  WaitCallback wc=new WaitCallback(this.DoSomeThing);
  ThreadPool.QueueUserWorkItem(wc,"参数");
}
private void DoSomeThing(object o)
{
  System.Func<string,int> f=new Func<string,int>(this.GetId);
  object result=f.Invoke(f,o.tostring());
  MessageBox.Show(result.ToString());
}
private int GetId(string name)
{
  this.textBox1.Text=name;
  if(Name=="cao")
  {
      return 9898;
  }
  else 
   return 0;
}