字符串，字节数组，流之间的转换

1 byte[]与string之间的转换

            string str1 = "123456";            byte[] buffer1 = System.Text.Encoding.ASCII.GetBytes(str1);            Stream stream = new MemoryStream(buffer1);             //return stream;            string str2 = System.Text.Encoding.ASCII.GetString(buffer1);            byte[] buffer2 = new byte[stream.Length];            stream.Read(buffer2,0,(int)stream.Length);            string str3 = System.Text.Encoding.ASCII.GetString(buffer2);            stream.Flush();            stream.Close();

2 base64字符串与byte[]的转换

/// <summary>        /// 把byte[]转成base64编码        /// </summary>        /// <param name="bytes"></param>        /// <returns></returns>        public static string ByteToBase64String(this byte[] bytes)        {            var base64Str = Convert.ToBase64String(bytes);            return base64Str;        }        /// <summary>        /// 从base64字符转byte[]        /// </summary>        /// <param name="base64Str"></param>        /// <returns></returns>        public static byte[] Base64StringToByte(this string base64Str)        {            var myByte = Convert.FromBase64String(base64Str);            return myByte;        }