C# 處理json字符串中image數據（byte）Base64

static void Main(string[] args)
        {

            string factString = "中華人民共和國";

            byte[] myByte;

            string Base64Str;

            //先把字符串按照utf-8的編碼轉換成byte[]

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

            //myByte中獲得這樣的字節數組：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[]轉成base64編碼,這個例子形成的base64編碼為:"5Lit5Y2O5Lq65rCR5YWx5ZKM5Zu9"

            Base64Str = Convert.ToBase64String(myByte);

            //再從base64編碼轉成byte[]，又恢復為字節數組：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);

            //用同一個Encoding對象把byte[]轉成字符串："中華人民共和國"

            factString = myEncoding.GetString(myByte);

            Console.WriteLine(factString);

        }