从不是创建控件“label1”的线程访问它。

System.Threading.Thread th;
       
       
        public delegate void SetValueEventHandler(Label label, string text);

      
        private void btnUpdate_Click(object sender, EventArgs e)
        {
         
           
            th = new System.Threading.Thread(new System.Threading.ThreadStart(do1));
            th.Start();
        }

    
        private void SetValueEvent(Label label, string text)
        {
           label.Text = text;
        }

        

        public void do1()
        {
            SetValueEventHandler setValue = new SetValueEventHandler( SetValueEvent );

            for( int i =0; i < 100000; i++ )
            {
                Invoke(setValue,new object[]{label1,i.ToString()} );
            }
        }

 

还有一种更简单的就是在线程开始前

   Control.CheckForIllegalCrossThreadCalls = false;

委托就可以完全不要了