JsonHelper类（序列化和反序列化辅助类）

1: using System;

   2: using System.Collections.Generic;

   3: using System.Linq;

   4: using System.Web;

   5: using System.Runtime.Serialization.Json;

   6: using System.IO;

   7: using System.Text;

   8: using System.Text.RegularExPRessions;

   9:  

  10: /// <summary>

  11: /// JSON序列化和反序列化辅助类

  12: /// </summary>

  13: public class JsonHelper

  14: {

  15:     /// <summary>

  16:     /// JSON序列化

  17:     /// </summary>

  18:     public static string JsonSerializer<T>(T t)

  19:     {

  20:         DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));

  21:         MemoryStream ms = new MemoryStream();

  22:         ser.WriteObject(ms, t);

  23:         string jsonString = Encoding.UTF8.GetString(ms.ToArray());

  24:         ms.Close();

  25:         //替换Json的Date字符串

  26:         string p = @"///Date/((/d+)/+/d+/)///";

  27:         MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);

  28:          Regex reg = new Regex(p);

  29:         jsonString = reg.Replace(jsonString, matchEvaluator);

  30:         return jsonString;

  31:     }

  32:  

  33:     /// <summary>

  34:     /// JSON反序列化

  35:     /// </summary>

  36:     public static T JsonDeserialize<T>(string jsonString)

  37:     {

  38:         //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"//Date(1294499956278+0800)//"格式

  39:         string p = @"/d{4}-/d{2}-/d{2}/s/d{2}:/d{2}:/d{2}";

  40:         MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);

  41:         Regex reg = new Regex(p);

  42:         jsonString = reg.Replace(jsonString, matchEvaluator);

  43:         DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));

  44:         MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));

  45:         T obj = (T)ser.ReadObject(ms);

  46:         return obj;

  47:     }

  48:  

  49:     /// <summary>

  50:     /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串

  51:     /// </summary>

  52:     private static string ConvertJsonDateToDateString(Match m)

  53:     {

  54:         string result = string.Empty;

  55:         DateTime dt = new DateTime(1970,1,1);

  56:         dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));

  57:         dt = dt.ToLocalTime();

  58:         result = dt.ToString("yyyy-MM-dd HH:mm:ss");

  59:         return result;

  60:     }

  61:  

  62:     /// <summary>

  63:     /// 将时间字符串转为Json时间

  64:     /// </summary>

  65:     private static string ConvertDateStringToJsonDate(Match m)

  66:     {

  67:         string result = string.Empty;

  68:         DateTime dt = DateTime.Parse(m.Groups[0].Value);

  69:         dt = dt.ToUniversalTime();

  70:         TimeSpan ts = dt - DateTime.Parse("1970-01-01");

  71:         result = string.Format("///Date({0}+0800)///",ts.TotalMilliseconds);

  72:         return result;

  73:     }

  74: }