解决Asp.net Mvc返回JsonResult中DateTime类型数据格式问题的方法

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。