csharp: string Encoding

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/// <summary>       /// 中文转unicode       /// </summary>       /// <param name="str"></param>       /// <returns></returns>       public static string unicode_0(string str)       {           string outStr = "";           if (!string.IsNullOrEmpty(str))           {               for (int i = 0; i < str.Length; i++)               {                   outStr += "/u" + ((int)str[i]).ToString("x");               }           }           return outStr;       }       /// <summary>       /// 汉字转为Unicode编码       /// </summary>       /// <param name="str"></param>       /// <returns></returns>       public static string bgktounicode(string str)       {           string outstr = "";           //汉字转为Unicode编码：           string hz = str;           byte[] b = Encoding.Unicode.GetBytes(hz);           string o = "";           foreach (var x in b)           {               o += string.Format("{0:X2}", x) + " ";           }           outstr = o;           return outstr;       }         /// <summary>       ///  unicode转中文       /// </summary>       /// <param name="str"></param>       /// <returns></returns>       public static string unicode_1(string str)       {           string outStr = "";           if (!string.IsNullOrEmpty(str))           {               string[] strlist = str.Replace("/", "").Split('u');               try               {                   for (int i = 1; i < strlist.Length; i++)                   {                       //将unicode字符转为10进制整数，然后转为char中文字符                        outStr += (char)int.Parse(strlist[i], System.Globalization.NumberStyles.HexNumber);                   }               }               catch (FormatException ex)               {                   outStr = ex.Message;               }           }           return outStr;       }       /// <summary>       /// unicode转中文（符合js规则的）       /// </summary>       /// <param name="str"></param>       /// <returns></returns>       public static string unicode_js_1(string str)       {           string outStr = "";           Regex reg = new Regex(@"(?i)\\u([0-9a-f]{4})");           outStr = reg.Replace(str, delegate(Match m1)           {               return ((char)Convert.ToInt32(m1.Groups[1].Value, 16)).ToString();           });           return outStr;       }       /// <summary>       /// 中文转unicode（符合js规则的）       /// </summary>       /// <param name="str"></param>       /// <returns></returns>       public static string unicode_js_0(string str)       {           string outStr = "";           string a = "";           if (!string.IsNullOrEmpty(str))           {               for (int i = 0; i < str.Length; i++)               {                   if (Regex.IsMatch(str[i].ToString(), @"[\u4e00-\u9fa5]")) { outStr += "\\u" + ((int)str[i]).ToString("x"); }                   else { outStr += str[i]; }               }           }           return outStr;       }         /// <summary>       /// 骞垮憡涓戦椈       /// </summary>       /// <param name="utf8String"></param>       /// <returns></returns>       public static string unicodeTogbk(string utf8String)       {           string defaultString = "";           Encoding utf8 = Encoding.UTF8;           Encoding defaultCode = Encoding.Default;           // Convert the string into a byte[].           byte[] utf8Bytes = Encoding.Default.GetBytes(utf8String);           // Perform the conversion from one encoding to the other.           byte[] defaultBytes = Encoding.Convert(utf8, defaultCode, utf8Bytes);           // Convert the new byte[] into a char[] and then into a string.           // This is a slightly different approach to converting to illustrate           // the use of GetCharCount/GetChars.           char[] defaultChars = new char[defaultCode.GetCharCount(defaultBytes, 0, defaultBytes.Length)];           defaultCode.GetChars(defaultBytes, 0, defaultBytes.Length, defaultChars, 0);           defaultString = new string(defaultChars);           return defaultString;       }       /// <summary>       /// 骞垮憡涓戦椈       /// </summary>       /// <param name="utf8String"></param>       /// <returns></returns>       public static string unicodeTogbkb(string utf8String)       {           string strBuffer = "";           byte[] buffer1 = Encoding.Default.GetBytes(utf8String);           byte[] buffer2 = Encoding.Convert(Encoding.UTF8, Encoding.Default, buffer1, 0, buffer1.Length);           strBuffer = Encoding.Default.GetString(buffer2, 0, buffer2.Length);           return strBuffer;       }