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 }