多线程中 用委托 操作 窗体的控件

        private void SetButtonState(bool b)
        {
            if (this.btn_GetNode.InvokeRequired)
            {
                SetButtonStateHandler d = new SetButtonStateHandler(SetButtonState);
                this.Invoke(d, new object[] { b });
            }
            else
            {
                this.btn_GetNode.Enabled = b;
                this.btn_getTopo.Enabled = b;
                this.btn_stopNodeGet.Enabled = !b;
            }
        }