C# 编码转换 UTF8转GB2312 GB2312转UTF8

来源：http://www.cnblogs.com/mahatmasmile/p/3467495.html
/// <summary>

        /// GB2312转换成UTF8

        /// </summary>

        /// <param name="text"></param>

        /// <returns></returns>

        public static string gb2312_utf8(string text)

        {

            //声明字符集   

            System.Text.Encoding utf8, gb2312;

            //gb2312   

            gb2312 = System.Text.Encoding.GetEncoding("gb2312");

            //utf8   

            utf8 = System.Text.Encoding.GetEncoding("utf-8");

            byte[] gb;

            gb = gb2312.GetBytes(text);

            gb = System.Text.Encoding.Convert(gb2312, utf8, gb);

            //返回转换后的字符   

            return utf8.GetString(gb);

        }



        /// <summary>

        /// UTF8转换成GB2312

        /// </summary>

        /// <param name="text"></param>

        /// <returns></returns>

        public static string utf8_gb2312(string text)

        {

            //声明字符集   

            System.Text.Encoding utf8, gb2312;

            //utf8   

            utf8 = System.Text.Encoding.GetEncoding("utf-8");

            //gb2312   

            gb2312 = System.Text.Encoding.GetEncoding("gb2312");

            byte[] utf;

            utf = utf8.GetBytes(text);

            utf = System.Text.Encoding.Convert(utf8, gb2312, utf);

            //返回转换后的字符   

            return gb2312.GetString(utf);

        }