C# string 转 byte[]

string 转 byte[]

        /// <summary>
        /// string 转 byte
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        byte[] Str_change_byte(string str)
        {
            byte[] Data = new byte[str.Length];
            int count = 0;
            string strSource = str.Replace("\n", "").Replace(" ", "").Replace("\t", "").Replace("\r", "");

            try
            {
                for (int i = 0; i < (strSource.Length - strSource.Length % 2) / 2; i++)//取余3运算作用是防止用户输入的字符为奇数个
                {
                    Data[count] = Convert.ToByte(strSource.Substring(i * 2, 2), 16);
                    count++;
                }
                if (strSource.Length % 2 != 0)//剩下一位单独处理
                {
                    Data[count] = Convert.ToByte(strSource.Substring(strSource.Length - 1, 1), 16);//单独处理B（0B）
                    count++;
                }
            }
            catch (Exception)
            {
                MessageBox.Show("Error：数据包含非法字符\n", "错误:", MessageBoxButtons.OK, MessageBoxIcon.Error);//出错提示
                return null;
            }
            byte[] buf = new byte[count];
            Array.Copy(Data, 0, buf, 0, count); //复制原始数据    
            return buf;
        }