C# 通过线程更新UI

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关键代码（form中增加）：

delegate void SetTextCallback(string text);

private Thread demoThread = null;

private void setTextSafeBtn_Click(
      object sender, 
      EventArgs e)
    {
      this.demoThread = 
        new Thread(new ThreadStart(this.ThreadProcSafe));

      this.demoThread.Start();
    }

private void ThreadProcSafe()
    {
      this.SetText("This text was set safely.");
    }

private void SetText(string text)
    {
      // InvokeRequired required compares the thread ID of the
      // calling thread to the thread ID of the creating thread.
      // If these threads are different, it returns true.
      if (this.textBox1.InvokeRequired)
      { 
        SetTextCallback d = new SetTextCallback(SetText);
        this.Invoke(d, new object[] { text });
      }
      else
      {
        this.textBox1.Text = text;
      }
    }