1,下面是文章地址：

主要是下面一个方法：

public static string UnicodeToGB(string text)        {            System.Text.RegularExpressions.MatchCollection mc = System.Text.RegularExpressions.Regex.Matches(text, "\\\\u([\\w]{4})");            if (mc != null && mc.Count > 0)            {                foreach (System.Text.RegularExpressions.Match m2 in mc)                {                    string v = m2.Value;                    string word = v.Substring(2);                    byte[] codes = new byte[2];                    int code = Convert.ToInt32(word.Substring(0, 2), 16);                    int code2 = Convert.ToInt32(word.Substring(2), 16);                    codes[0] = (byte)code2;                    codes[1] = (byte)code;                    text = text.Replace(v, Encoding.Unicode.GetString(codes));                }            }            else            {             }            return text;        }

2,另外一篇文章：http://www.cnblogs.com/beer/archive/2010/06/09/1754901.html