C# 处理json字符串中image数据（byte）Base64

static void Main(string[] args)
        {

            string factString = "中华人民共和国";

            byte[] myByte;

            string Base64Str;

            //先把字符串按照utf-8的编码转换成byte[]

            Encoding myEncoding = Encoding.GetEncoding("utf-8");

            //myByte中获得这样的字节数组：228,184,173,229,141,142,228,186,186,230,176,145,229,133,177,229,146,140,229,155,189

            myByte = myEncoding.GetBytes(factString);

            //把byte[]转成base64编码,这个例子形成的base64编码为:"5Lit5Y2O5Lq65rCR5YWx5ZKM5Zu9"

            Base64Str = Convert.ToBase64String(myByte);

            //再从base64编码转成byte[]，又恢复为字节数组：228,184,173,229,141,142,228,186,186,230,176,145,229,133,177,229,146,140,229,155,189

            myByte = Convert.FromBase64String(Base64Str);

            //用同一个Encoding对象把byte[]转成字符串："中华人民共和国"

            factString = myEncoding.GetString(myByte);

            Console.WriteLine(factString);

        }