解決Asp.net Mvc返回JsonResult中DateTime類型數據格式的問題

問題背景：

           在使用asp.net mvc 結合jquery esayui做一個系統，但是在使用使用this.json方法直接返回一個json對象，在列表中顯示時發現datetime類型的數據在轉為字符串是它默認轉為Date(84923838332223)的格式，在經過查資料發現使用前端來解決這個問題的方法不少，但是我又發現在使用jquery easyui時，加載列表數據又不能對數據進行攔截，進行數據格式轉換之后再加載，后來發現可以通過自定義JsonResult實現，認為這種方法比較可行，就開始研究

我們先來看看jsonResult的源碼

    public class JsonResult : ActionResult
    {
        public JsonResult()
        {
            this.JsonRequestBehavior = System.Web.Mvc.JsonRequestBehavior.DenyGet;
        }
        
        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            if ((this.JsonRequestBehavior == System.Web.Mvc.JsonRequestBehavior.DenyGet) && string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
            {
                throw new InvalidOperationException(MvcResources.JsonRequest_GetNotAllowed);
            }
            HttpResponseBase response = context.HttpContext.Response;
            if (!string.IsNullOrEmpty(this.ContentType))
            {
                response.ContentType = this.ContentType;
            }
            else
            {
                response.ContentType = "application/json";
            }
            if (this.ContentEncoding != null)
            {
                response.ContentEncoding = this.ContentEncoding;
            }
            if (this.Data != null)
            {
                JavaScriptSerializer serializer = new JavaScriptSerializer(); 34                 response.Write(serializer.Serialize(this.Data));
            }
        }
        
        public Encoding ContentEncoding { get; set; }
        
        public string ContentType { get; set; }
        
        public object Data { get; set; }
        
        public System.Web.Mvc.JsonRequestBehavior JsonRequestBehavior { get; set; }
    }
}

當我看到上面代碼中的紅色部分，我感到有些熟悉，心里比較高興，以前使用過ashx來傳json的都應該用過此方法吧

原來它也是使用這個方法進行序列化的。我們就可以在這個地方先獲取到json序列化之后的字符串！然后做寫“小動作”，就ok了

下面我就定義了一個自己的JsonResult了

    /// <summary>
    /// 自定義Json視圖
    /// </summary>
    public class CustomJsonResult:JsonResult
    {
        /// <summary>
        /// 格式化字符串
        /// </summary>
        public string FormateStr
        {
            get;
            set;
        }

        /// <summary>
        /// 重寫執行視圖
        /// </summary>
        /// <param name="context">上下文</param>
        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }

            HttpResponseBase response = context.HttpContext.Response;

            if (string.IsNullOrEmpty(this.ContentType))
            {
                response.ContentType = this.ContentType;
            }
            else
            {
                response.ContentType = "application/json";
            }

            if (this.ContentEncoding != null)
            {
                response.ContentEncoding = this.ContentEncoding;
            }

            if (this.Data != null)
            {
                JavaScriptSerializer jss = new JavaScriptSerializer();
45                 string jsonString = jss.Serialize(Data);
46                 string p = @"\\/Date\((\d+)\)\\/";
47                 MatchEvaluator matchEvaluator = new MatchEvaluator(this.ConvertJsonDateToDateString);
48                 Regex reg = new Regex(p);
49                 jsonString = reg.Replace(jsonString, matchEvaluator);

                response.Write(jsonString);
            }
        }

          /// <summary>  
        /// 將Json序列化的時間由/Date(1294499956278)轉為字符串 .
        /// </summary>  
        /// <param name="m">正則匹配</param>
        /// <returns>格式化后的字符串</returns>
        private 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(FormateStr);
            return result;
        }
    }

在這里做的“小動作”就是紅色部分，得到字符串以后，通過正則表達式的方式獲得Date(12347838383333)的字符串，然后把它轉換為DateTime類型，最后在轉為我們想要的格式即可，這個格式可以使用FormateStr屬性設置。

剩下的就是使用我們自己定義的JsonResult來替換asp.net mvc默認的JsonResult的問題了，接着從源碼中找答案，下面是Controller類的部分代碼

        protected internal JsonResult Json(object data)
        {
            return this.Json(data, null, null, JsonRequestBehavior.DenyGet);
        }
        
        protected internal JsonResult Json(object data, string contentType)
        {
            return this.Json(data, contentType, null, JsonRequestBehavior.DenyGet);
        }
        
        protected internal JsonResult Json(object data, JsonRequestBehavior behavior)
        {
            return this.Json(data, null, null, behavior);
        }
        
        protected internal virtual JsonResult Json(object data, string contentType, Encoding contentEncoding)
        {
            return this.Json(data, contentType, contentEncoding, JsonRequestBehavior.DenyGet);
        }
        
        protected internal JsonResult Json(object data, string contentType, JsonRequestBehavior behavior)
        {
            return this.Json(data, contentType, null, behavior);
        }
        
        protected internal virtual JsonResult Json(object data, string contentType, Encoding contentEncoding, JsonRequestBehavior behavior)
27         {
28             return new JsonResult { Data = data, ContentType = contentType, ContentEncoding = contentEncoding, JsonRequestBehavior = behavior };
29         }

以上是Controller類來實例化JsonResult的所有代碼。我們只需寫一個BaseController類，重寫最后一個方法即可，然后我們自己的Controller在繼承BaseController即可

下面是BaseController類的部分代碼，我們為方便自己個性化的需要又定義了兩個MyJosn的方法

  /// <summary>
        /// 返回JsonResult
        /// </summary>
        /// <param name="data">數據</param>
        /// <param name="contentType">內容類型</param>
        /// <param name="contentEncoding">內容編碼</param>
        /// <param name="behavior">行為</param>
        /// <returns>JsonReuslt</returns>
        protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding, JsonRequestBehavior behavior)
        {
            return new CustomJsonResult
            {
                Data = data,
                ContentType = contentType,
                ContentEncoding =contentEncoding,
                JsonRequestBehavior = behavior,
                FormateStr = "yyyy-MM-dd HH:mm:ss"
            };
        }

        /// <summary>
        /// 返回JsonResult.24         /// </summary>
        /// <param name="data">數據</param>
        /// <param name="behavior">行為</param>
        /// <param name="format">json中dateTime類型的格式</param>
        /// <returns>Json</returns>
        protected JsonResult MyJson(object data, JsonRequestBehavior behavior,string format)
        {
            return new CustomJsonResult
            {
                Data = data,
                JsonRequestBehavior = behavior,
                FormateStr = format
            };
        }

        /// <summary>
        /// 返回JsonResult42         /// </summary>
        /// <param name="data">數據</param>
        /// <param name="format">數據格式</param>
        /// <returns>Json</returns>
        protected JsonResult MyJson(object data, string format)
        {
            return new CustomJsonResult
            {
                Data = data,
                FormateStr = format
            };
        }

最后我們在自己的Controller中調用即可

public class ProjectMileStoneController : BaseController
    {
        /// <summary>
        /// 首頁視圖
        /// </summary>
        /// <returns>視圖</returns>
        public ActionResult Index()
        {
            return this.View();
        }

        #region  項目里程碑查詢

        /// <summary>
        /// 根據項目編號獲取項目里程碑
        /// </summary>
        /// <param name="projectId">項目編號</param>
        /// <returns>項目里程碑</returns>
        public JsonResult GetProjectMileStoneByProjectId(int projectId)
        {
            IList<ProjectMileStone> projectMileStones = FacadeContainer.Get<IProjectMileStoneService>().GetProjectMileStonesByProjectId(projectId);
            return this.MyJson(projectMileStones,  "yyyy.MM.dd");
        }

        #endregion
    }