Url中文编码_.NET_编程开发_程序员俱乐部

   几个重要的方法：

                 Encoding.UTF8.GetString(byte[])
                 Encoding.UTF8.GetBytes(String) 
                 Encoding.GetEncoding(String).GetBytes(String) 
                 Encoding.GetEncoding(String).GetString(byte[]) 
                 Convert.ToString(byte,int)
                 Convert.ToByte(String,int)

    class Program
    {
        static void Main(string[] args)
        {
            string str = "中文大吧天";
            //Gb2312编码
            Console.WriteLine(GB2312(str));
            //GB2312解码
            Console.WriteLine(DeGB2312(GB2312(str)));
            //UTF8编码
            Console.WriteLine(EnUTF8(str));
            //UTF8解码
            Console.WriteLine(DeUTF8(EnUTF8(str)));        
            Console.ReadKey();
        }
        /// <summary>
        /// GB2312编码
        /// </summary>
        /// <param name="str">待编码字符</param>
        /// <returns>编码结果</returns>
        public static string GB2312(string str)
        {
            StringBuilder sb = new StringBuilder();
            //GB2321的编码方式
            byte[] byStr = System.Text.Encoding.GetEncoding ("GB2312").GetBytes(str); 
            for (int i = 0; i < byStr.Length; i++)
            {
                //转换为16进制方式 可选2,8,10,16进制
                sb.Append(@"%" + Convert.ToString(byStr[i], 16));
            }
            return (sb.ToString());
        }
         /// <summary>
        /// GB2312解码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DeGB2312(string str)
        {
            byte[] bytes = new byte[str.Split('%').Length ];
            int i=0;
            foreach (var item in str.Split('%'))
            {
                if (item !="")
                {
                    //转换为16进制的字节
                    bytes[i] = Convert.ToByte(item,16);
                    i++;
                }
              
            }
            //GB2312的解码
            return Encoding.GetEncoding ("GB2312").GetString(bytes);
        }

        /// <summary>
        /// UTF8编码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string EnUTF8(string str)
        {
            StringBuilder sb = new StringBuilder();
            byte[] byStr = System.Text.Encoding.UTF8.GetBytes(str); 
            for (int i = 0; i < byStr.Length; i++)
            {
                sb.Append(@"%" + Convert.ToString(byStr[i], 16));
            }

            return (sb.ToString());
        }
        /// <summary>
        /// UTF8解码
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DeUTF8(string str)
        {
            byte[] bytes = new byte[str.Split('%').Length ];
            int i=0;
            foreach (var item in str.Split('%'))
            {
                if (item !="")
                {
                    bytes[i] = Convert.ToByte(item,16);
                    i++;
                }
              
            }
            return Encoding.UTF8.GetString(bytes);
        }
    }

程序链接