从不是创建控件的线程访问(C# winFrom)

publicdelegatevoid MyInvoke(string str);

privatevoid button9_Click(object sender, EventArgs e)
{
//_myInvoke = new MyInvoke(SetText);
//CheckForIllegalCrossThreadCalls = false; Thread t =new Thread(new ThreadStart(fun));
t.Start();
}

privatevoid fun()
{
//_myInvoke("dddd"); SetText("ddd");
}
privatevoid SetText(string s)
{
if (textBox6.InvokeRequired)
{
MyInvoke _myInvoke =new MyInvoke(SetText);
this.Invoke(_myInvoke, newobject[] { s });
}
else
{
this.textBox6.Text = s;
}
}