private delegate void DelOutput(string str);

        /// <summary>
        /// 向text中写入文本
        /// </summary>
        /// <param name="str"></param>
        public void output(string str)
        {
            if (this.InvokeRequired)
            {
                DelOutput output = new DelOutput(this.output);
                this.Invoke(output, new object[] { str });
            }
            else
            {
                this.textBox1.Text += str + Environment.NewLine;
            }
        }