C# 跨线程设置TextBox.Text

        delegate void SetTextCallback(string text); 
        public Form1()
        {
            InitializeComponent();
        }
        public  void SetText(string text)
        {
            if (this.textBox1.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.textBox1.Text = text;
            }
        }