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;
        }