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 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

1public class JsonResult : ActionResult 2{ 3 public JsonResult() 4 { 5 this.JsonRequestBehavior = System.Web.Mvc.JsonRequestBehavior.DenyGet; 6 } 78 public override void ExecuteResult(ControllerContext context) 9 {10 if (context == null)11 {12 throw new ArgumentNullException("context");13 }14 if ((this.JsonRequestBehavior == System.Web.Mvc.JsonRequestBehavior.DenyGet) && string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))15 {16 throw new InvalidOperationException(MvcResources.JsonRequest_GetNotAllowed);17 }18 HttpResponseBase response = context.HttpContext.Response;19 if (!string.IsNullOrEmpty(this.ContentType))20 {21 response.ContentType = this.ContentType;22 }23 else24 {25 response.ContentType = "application/json";26 }27 if (this.ContentEncoding != null)28 {29 response.ContentEncoding = this.ContentEncoding;30 }31 if (this.Data != null)32 {33JavaScriptSerializer serializer = new JavaScriptSerializer();34 response.Write(serializer.Serialize(this.Data));35 }36 }37 38 public Encoding ContentEncoding { get; set; }39 40 public string ContentType { get; set; }41 42 public object Data { get; set; }43 44 public System.Web.Mvc.JsonRequestBehavior JsonRequestBehavior { get; set; }45}46 }

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

1/// <summary> 2/// 自定义Json视图 3/// </summary> 4public class CustomJsonResult:JsonResult 5{ 6 /// <summary> 7 /// 格式化字符串 8 /// </summary> 9 public string FormateStr10 {11 get;12 set;13 }14 15 /// <summary>16 /// 重写执行视图17 /// </summary>18 /// <param name="context">上下文</param>19 public override void ExecuteResult(ControllerContext context)20 {21 if (context == null)22 {23 throw new ArgumentNullException("context");24 }25 26 HttpResponseBase response = context.HttpContext.Response;27 28 if (string.IsNullOrEmpty(this.ContentType))29 {30 response.ContentType = this.ContentType;31 }32 else33 {34 response.ContentType = "application/json";35 }36 37 if (this.ContentEncoding != null)38 {39 response.ContentEncoding = this.ContentEncoding;40 }41 42 if (this.Data != null)43 {44 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);50 51 response.Write(jsonString);52 }53 }54 55 /// <summary> 56 /// 将Json序列化的时间由/Date(1294499956278)转为字符串 .57 /// </summary> 58 /// <param name="m">正则匹配</param>59 /// <returns>格式化后的字符串</returns>60 private string ConvertJsonDateToDateString(Match m)61 {62 string result = string.Empty;63 DateTime dt = new DateTime(1970, 1, 1);64 dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));65 dt = dt.ToLocalTime();66 result = dt.ToString(FormateStr);67 return result;68 }69}

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 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

1 protected internal JsonResult Json(object data) 2 { 3 return this.Json(data, null, null, JsonRequestBehavior.DenyGet); 4 } 56 protected internal JsonResult Json(object data, string contentType) 7 { 8 return this.Json(data, contentType, null, JsonRequestBehavior.DenyGet); 9 }10 11 protected internal JsonResult Json(object data, JsonRequestBehavior behavior)12 {13 return this.Json(data, null, null, behavior);14 }15 16 protected internal virtual JsonResult Json(object data, string contentType, Encoding contentEncoding)17 {18 return this.Json(data, contentType, contentEncoding, JsonRequestBehavior.DenyGet);19 }20 21 protected internal JsonResult Json(object data, string contentType, JsonRequestBehavior behavior)22 {23 return this.Json(data, contentType, null, behavior);24 }25 26 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

1 /// <summary> 2 /// 返回JsonResult 3 /// </summary> 4 /// <param name="data">数据</param> 5 /// <param name="contentType">内容类型</param> 6 /// <param name="contentEncoding">内容编码</param> 7 /// <param name="behavior">行为</param> 8 /// <returns>JsonReuslt</returns> 9 protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding, JsonRequestBehavior behavior)10 {11 return new CustomJsonResult12 {13 Data = data,14 ContentType = contentType,15 ContentEncoding =contentEncoding,16 JsonRequestBehavior = behavior,17 FormateStr = "yyyy-MM-dd HH:mm:ss"18 };19 }20 21 /// <summary>22 /// 返回JsonResult.24 /// </summary>25 /// <param name="data">数据</param>26 /// <param name="behavior">行为</param>27 /// <param name="format">json中dateTime类型的格式</param>28 /// <returns>Json</returns>29 protected JsonResult MyJson(object data, JsonRequestBehavior behavior,string format)30 {31 return new CustomJsonResult32 {33 Data = data,34 JsonRequestBehavior = behavior,35 FormateStr = format36 };37 }38 39 /// <summary>40 /// 返回JsonResult42 /// </summary>43 /// <param name="data">数据</param>44 /// <param name="format">数据格式</param>45 /// <returns>Json</returns>46 protected JsonResult MyJson(object data, string format)47 {48 return new CustomJsonResult49 {50 Data = data,51 FormateStr = format52 };53 }

最后我们在自己的Controller中调用即可

1 public class ProjectMileStoneController : BaseController 2{ 3 /// <summary> 4 /// 首页视图 5 /// </summary> 6 /// <returns>视图</returns> 7 public ActionResult Index() 8 { 9 return this.View();10 }11 12 #region 项目里程碑查询13 14 /// <summary>15 /// 根据项目编号获取项目里程碑16 /// </summary>17 /// <param name="projectId">项目编号</param>18 /// <returns>项目里程碑</returns>19 public JsonResult GetProjectMileStoneByProjectId(int projectId)20 {21 IList<ProjectMileStone> projectMileStones = FacadeContainer.Get<IProjectMileStoneService>().GetProjectMileStonesByProjectId(projectId);22 return this.MyJson(projectMileStones, "yyyy.MM.dd");23 }24 25 #endregion26}