JavaScriptSerializer 序列号datatime时少了8小时

有人说主要的因素是在于JSON格式不直接支持日期和时间。

简单一点处理办法是ToLocalTime()一下：dt = dt.ToLocalTime();

参考http://blog.csdn.net/cncdns/article/details/6164389 写个jsonhelp。不直接调用JavaScriptSerializer 的序列号就能解决这个问题。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
/// <summary>
/// JSON序列化和反序列化辅助类
/// </summary>
public class JsonHelper
{
     /// <summary>
    /// JSON序列化
    /// </summary>
     public static string JsonSerializer<T>(T t)
     {
         DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
         MemoryStream ms = new MemoryStream();
        ser.WriteObject(ms, t);
         string jsonString = Encoding.UTF8.GetString(ms.ToArray());
         ms.Close();
         //替换Json的Date字符串
         string p = @"///Date/((/d+)/+/d+/)///"; /*////Date/((([/+/-]/d+)|(/d+))[/+/-]/d+/)////*/
         MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
          Regex reg = new Regex(p);
         jsonString = reg.Replace(jsonString, matchEvaluator);
         return jsonString;
     }
     /// <summary>
     /// JSON反序列化
     /// </summary>
     public static T JsonDeserialize<T>(string jsonString)
     {
         //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"//Date(1294499956278+0800)//"格式
         string p = @"/d{4}-/d{2}-/d{2}/s/d{2}:/d{2}:/d{2}";
        MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
        Regex reg = new Regex(p);
         jsonString = reg.Replace(jsonString, matchEvaluator);
         DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
        MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
         T obj = (T)ser.ReadObject(ms);
         return obj;
     }  

     /// <summary>
     /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串
     /// </summary>
     private static string ConvertJsonDateToDateString(Match m)
     {
         string result = string.Empty;
         DateTime dt = new DateTime(,,);
         dt = dt.AddMilliseconds(long.Parse(m.Groups[].Value));
         dt = dt.ToLocalTime();
         result = dt.ToString("yyyy-MM-dd HH:mm:ss");
        return result;
     }
     /// <summary>
     /// 将时间字符串转为Json时间
     /// </summary>
     private static string ConvertDateStringToJsonDate(Match m)
     {
         string result = string.Empty;
         DateTime dt = DateTime.Parse(m.Groups[].Value);
         dt = dt.ToUniversalTime();
         TimeSpan ts = dt - DateTime.Parse("1970-01-01");
         result = string.Format("///Date({0}+0800)///",ts.TotalMilliseconds);
        return result;
    }
 }