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