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

 1     public class JsonResult : ActionResult

 2     {

 3         public JsonResult()

 4         {

 5             this.JsonRequestBehavior = System.Web.Mvc.JsonRequestBehavior.DenyGet;

 6         }

 7         

 8         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             else

24             {

25                 response.ContentType = "application/json";

26             }

27             if (this.ContentEncoding != null)

28             {

29                 response.ContentEncoding = this.ContentEncoding;

30             }

31             if (this.Data != null)

32             {

33                 JavaScriptSerializer 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>

 4     public class CustomJsonResult:JsonResult

 5     {

 6         /// <summary>

 7         /// 格式化字符串

 8         /// </summary>

 9         public string FormateStr

10         {

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             else

33             {

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

 1         protected internal JsonResult Json(object data)

 2         {

 3             return this.Json(data, null, null, JsonRequestBehavior.DenyGet);

 4         }

 5         

 6         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 CustomJsonResult

12             {

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 CustomJsonResult

32             {

33                 Data = data,

34                 JsonRequestBehavior = behavior,

35                 FormateStr = format

36             };

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 CustomJsonResult

49             {

50                 Data = data,

51                 FormateStr = format

52             };

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         #endregion

26     }