.net 實體類與json轉換（.net自帶類庫實現）更新

上一篇文章中寫到在.net中實體類跟json格式的相互轉換，今天在做具體轉換時候，發現之前版本的jsonhelp對於日期類型的轉換不全面。之前版本的jsonhelp中從實體類轉換成json格式時候，將日期格式轉成了時間戳的形式。在這裡對這個jsonhelp做出了更新。以解決轉換日期類型欄位的問題。代碼如下：

JsonHelp.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text.RegularExpressions;
namespace JsonTest
{
    class JsonHelp
    {
        public JsonHelp()
        {
            //
            // TODO: Add constructor logic here
            //
        }
        /// <summary>
        /// 把對象序列化 JSON 字元串 
        /// </summary>
        /// <typeparam name="T">對象類型</typeparam>
        /// <param name="obj">對象實體</param>
        /// <returns>JSON字元串</returns>
        public static string GetJson<T>(T obj)
        {
            //記住 添加引用 System.ServiceModel.Web 
            /**
             * 如果不添加上面的引用,System.Runtime.Serialization.Json; Json是出不來的哦
             * */
            DataContractJsonSerializer json = new DataContractJsonSerializer(typeof(T));
            using (MemoryStream ms = new MemoryStream())
            {
                json.WriteObject(ms, obj);
                string jsonString = Encoding.UTF8.GetString(ms.ToArray());
                string pattern = @"\\/Date\((\d+)\+\d+\)\\/";
                MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
                Regex reg = new Regex(pattern);
                jsonString = reg.Replace(jsonString, matchEvaluator);
                return jsonString;
            }
        }
        /// <summary>
        /// 把JSON字元串還原為對象
        /// </summary>
        /// <typeparam name="T">對象類型</typeparam>
        /// <param name="jsonString">JSON字元串</param>
        /// <returns>對象實體</returns>
        public static T ParseFormJson<T>(string jsonString)
        {
            T obj = Activator.CreateInstance<T>();
            string pattern = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
            Regex reg = new Regex(pattern);
            jsonString = reg.Replace(jsonString, matchEvaluator);
            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
            {
                DataContractJsonSerializer dcj = new DataContractJsonSerializer(typeof(T));
                return (T)dcj.ReadObject(ms);
            }
        }
        /// <summary>
        /// 將Json序列化的時間由/Date(1304931520336+0800)/轉為字元串
        /// </summary>
        private static string ConvertJsonDateToDateString(Match m)
        {
            string result = string.Empty;
            DateTime dt = new DateTime(1970, 1, 1);
            dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));
            dt = dt.ToLocalTime();
            result = dt.ToString("yyyy-MM-dd HH:mm:ss");
            return result;
        }
        /// <summary>
        /// 將時間字元串轉為Json時間
        /// </summary>
        private static string ConvertDateStringToJsonDate(Match m)
        {
            string result = string.Empty;
            DateTime dt = DateTime.Parse(m.Groups[0].Value);
            dt = dt.ToUniversalTime();
            TimeSpan ts = dt - DateTime.Parse("1970-01-01");
            result = string.Format("\\/Date({0}+0800)\\/", ts.TotalMilliseconds);
            return result;
        }


    }
}

測試代碼：

using ConsoleApplication1.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var db = new JooWMSContext()) 
            {
                var admin = db.Admins.Where(p => p.ID > 0).OrderBy(p => p.ID);
                foreach (var ad in admin) 
                {
                    Console.WriteLine(JsonTest.JsonHelp.GetJson<ConsoleApplication1.Models.Admin>(ad));
                }
                Console.ReadKey();
            }
        }
    }
}

寫測試代碼時候 用到了EF ，這裡推薦一個不錯的工具。EF Power Tools 目前是beta4 版本。