private void richTextBox1_KeyUp(object sender, KeyEventArgs e)
        {
            StringBuilder chineseChar;
            int chineseChars = GetChineseLength(this.richTextBox1.Text.Trim(), out chineseChar);
            if (chineseChars > 0)
            {
                this.textBox1.Text = string.Format("共有 '{0}' 个汉字 ", chineseChars, chineseChar.ToString());
            }
我代码弄来弄去还是整不对啊

没有人吗，  求解答啊