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(); string jsonString = jss.Serialize(Data); string p = @"///Date/((/d+)/)///"; MatchEvaluator matchEvaluator = new MatchEvaluator(this.ConvertJsonDateToDateString); Regex reg = new Regex(p); 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) { return new JsonResult { Data = data, ContentType = contentType, ContentEncoding = contentEncoding, JsonRequestBehavior = behavior }; } 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 } 原文地址：http://www.cnblogs.com/JerryWang1991
以上就是Asp.net Mvc返回JsonResult中DateTime类型数据格式问题的解决方法，希望对大家的学习有所帮助。
