c# 十六进制与十进制 转换

 

 十进制转成十六进制

1.方式一：手动位移
 
    
        public static byte[] intToBytes(int value)
        {
            byte[] src = new byte[4];
            src[3] = (byte)((value >> 24) & 0xFF);
            src[2] = (byte)((value >> 16) & 0xFF);
            src[1] = (byte)((value >> 8) & 0xFF);
            src[0] = (byte)(value & 0xFF);
            return src;
        }
       
        public static int bytesToInt(byte[] src, int offset)
        {
            int value;
            value = (int)((src[offset] & 0xFF)
                    | ((src[offset + 1] & 0xFF) << 8)
                    | ((src[offset + 2] & 0xFF) << 16)
                    | ((src[offset + 3] & 0xFF) << 24));
            return value;
        } 
2.方式二：使用BitConverter
    
        public static int IntToBitConverter(int num)
        {
            int temp = 0;
            byte[] bytes = BitConverter.GetBytes(num);//将int32转换为字节数组
            temp = BitConverter.ToInt32(bytes, 0);//将字节数组内容再转成int32类型
            return temp;
        }

　　

十六进制与十进制，整数互转

          //十六进制byte数组转为 int 十进制
            byte[] d1 = new byte[4] {0x34,0xFB,0x5E,0x38 };
            if (BitConverter.IsLittleEndian)
                Array.Reverse(d1); //need the bytes in the reverse order
            int value = BitConverter.ToInt32(d1, 0);
            ///十六进制数字字符串转为int 十进制
            int va = Convert.ToInt32("34FB5E38", 16);

 

 

十六进制与字符串互转：

        public static byte[] StringToBytes(string TheString)
        {
            Encoding FromEcoding = Encoding.GetEncoding("UTF-8");
            Encoding ToEcoding = Encoding.GetEncoding("GB2312");
            byte[] FromBytes = FromEcoding.GetBytes(TheString);
            byte[] ToBytes = Encoding.Convert(FromEcoding, ToEcoding, FromBytes);
            return ToBytes;
        }

        public static string BytesToString(byte[] Bytes)
        {
            string Mystring;
            Encoding FromEcoding = Encoding.GetEncoding("GB2312");
            Encoding ToEcoding = Encoding.GetEncoding("UTF-8");

            byte[] ToBytes = Encoding.Convert(FromEcoding, ToEcoding, Bytes);
            Mystring = ToEcoding.GetString(ToBytes);
            return Mystring;
        }