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

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();
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);

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)
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

/// <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.         /// </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JsonResult         /// </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
}