解决Asp.net Mvc返回JsonResult中DateTime类型数据格式的问题

问题背景：

           在使用asp.net mvc 结合jquery esayui做一个系统，但是在使用使用this.json方法直接返回一个json对象，在列表中显示时发现datetime类型的数据在转为字符串是它默认转为Date(84923838332223)的格式，在经过查资料发现使用前端来解决这个问题的方法不少，但是我又发现在使用jquery easyui时，加载列表数据又不能对数据进行拦截，进行数据格式转换之后再加载，后来发现可以通过自定义JsonResult实现，认为这种方法比较可行，就开始研究

我们先来看看jsonResult的源码

    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();
                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; }
    }
}

当我看到上面代码中的红色部分，我感到有些熟悉，心里比较高兴，以前使用过ashx来传json的都应该用过此方法吧

原来它也是使用这个方法进行序列化的。我们就可以在这个地方先获取到json序列化之后的字符串！然后做写“小动作”，就ok了

下面我就定义了一个自己的JsonResult了

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

        /// <summary>
        /// 重写执行视图
        /// </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>  
        /// 将Json序列化的时间由/Date(1294499956278)转为字符串 .
        /// </summary>  
        /// <param name="m">正则匹配</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;
        }
    }

在这里做的“小动作”就是红色部分，得到字符串以后，通过正则表达式的方式获得Date(12347838383333)的字符串，然后把它转换为DateTime类型，最后在转为我们想要的格式即可，这个格式可以使用FormateStr属性设置。

剩下的就是使用我们自己定义的JsonResult来替换asp.net mvc默认的JsonResult的问题了，接着从源码中找答案，下面是Controller类的部分代码

        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类来实例化JsonResult的所有代码。我们只需写一个BaseController类，重写最后一个方法即可，然后我们自己的Controller在继承BaseController即可

下面是BaseController类的部分代码，我们为方便自己个性化的需要又定义了两个MyJosn的方法

  /// <summary>
        /// 返回JsonResult
        /// </summary>
        /// <param name="data">数据</param>
        /// <param name="contentType">内容类型</param>
        /// <param name="contentEncoding">内容编码</param>
        /// <param name="behavior">行为</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">数据</param>
        /// <param name="behavior">行为</param>
        /// <param name="format">json中dateTime类型的格式</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">数据</param>
        /// <param name="format">数据格式</param>
        /// <returns>Json</returns>
        protected JsonResult MyJson(object data, string format)
        {
            return new CustomJsonResult
            {
                Data = data,
                FormateStr = format
            };
        }

最后我们在自己的Controller中调用即可

public class ProjectMileStoneController : BaseController
    {
        /// <summary>
        /// 首页视图
        /// </summary>
        /// <returns>视图</returns>
        public ActionResult Index()
        {
            return this.View();
        }

        #region  项目里程碑查询

        /// <summary>
        /// 根据项目编号获取项目里程碑
        /// </summary>
        /// <param name="projectId">项目编号</param>
        /// <returns>项目里程碑</returns>
        public JsonResult GetProjectMileStoneByProjectId(int projectId)
        {
            IList<ProjectMileStone> projectMileStones = FacadeContainer.Get<IProjectMileStoneService>().GetProjectMileStonesByProjectId(projectId);
            return this.MyJson(projectMileStones,  "yyyy.MM.dd");
        }

        #endregion
    }