多线程问题，子线程访问主线程控件，修改内容不实时！
public delegate void SetTextHander(Label lbl);

private void button1_Click(object sender, EventArgs e)
{
Thread.Sleep(1000);
Thread t1 = new System.Threading.Thread(new ThreadStart(() => SetLblText(lbl1)));
t1.IsBackground = true;
t1.Start();
Thread t2 = new System.Threading.Thread(new ThreadStart(() => SetLblText(lbl2)));
t2.IsBackground = true;
t2.Start();
}

public void SetLblText(Label lbl)
{
if (this.InvokeRequired)
{
SetTextHander sth = new SetTextHander(SetLblText);
this.BeginInvoke(sth, lbl);
}
else
{
//Application.DoEvents();
for (int i = 0; i < 10; i++)
{
Thread.Sleep(300);
lbl.Text = i.ToString();
}
}
}
需求：需要界面上控件值同时实时改变，互不影响！
求解答！

[解决办法]

C# code

  for (int i = 0; i < 10; i++)  {  lbl.Text = i.ToString();  }
[解决办法]
没有测试你说的效果。
但我的理解是，线程调度由系统控制，不是休眠300ms之后就立即执行的。