delegate void AddTextToControl_delegate(string str);
void Begin()
{
 Thread addColorThread = new Thread(new ThreadStart(AddColorToList_M));
        addColorThread.Start();
}
 void AddTextToRichTextBox(string text)
        {
            if (rTextBox.InvokeRequired)
            {
                AddTextToControl_delegate d = new AddTextToControl_delegate(AddTextToRichTextBox);
                rTextBox.Invoke(d, new object[] { text});
            }
            else
            {
                rTextBox.AppendText(text + "\n");
                rTextBox.Select(rTextBox.TextLength, 0);
                rTextBox.ScrollToCaret();
            }
        }

调用 AddTextToRichTextBox(string str)给控件赋值

------解决方案--------------------
声明了一个线程：  
private Thread CTrlThread;  

声明一个委托：
Delegate void DelegateCTrlThr();
声明了一个方法：  
private void CTrlThr()  
{  
 this.listBox1.Items.Add("AAAAA");  
}  

封装方法:
DelegateCTrlTr objDelegateCTrlTr = new DelegateCTrlTr (CTrlThr);
用INVOKE方法 调用委托:
private void ThreadMethod()
{
  this.INVOKE(objDelegateCTrlTr );
}
private void  

在按钮事件中启动线程 注意线程封装的方法是用ThreadMethod()方法：  
private void button4_Click(object sender, EventArgs e)  
{  
 CTrlThread = new Thread(new System.Threading.ThreadStart(ThreadMethod));  
               this.CTrlThread.Start();  
}