填充列表 <object> 與推JSON數據和顯示表

Question

我正在使用aspx引擎。 我一直在嘗試將數據推送到列表中，但我不知道如何。 每次我運行程序時，它都會說創建一個對象的新實例..im我不太確定他們在說什么..但是我確實創建了該類的實例，但仍然無法正常工作有人可以幫我嗎

這是我試圖在我的家庭控制器中填充數據

    public ActionResult GetEvent()
    {
        try
        {

            string i = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa";
            string et = "KI2XfwQNByLPFdK4i3a74slLT7sjjzYRi9RR7zEtCoQ%3D";
            string t = "20111128183020";
            string _checkingUrl =  String.Format("http://172.22.22.10/SampleAPI/Event/GetEvents?at={0}&et={1}&t={2}&responseFormat=json", i, et, t);
            System.Net.HttpWebRequest request=System.Net.WebRequest.Create(_checkingUrl) as System.Net.HttpWebRequest;
            System.Net.HttpWebResponse response=request.GetResponse() as System.Net.HttpWebResponse;
            System.IO.StreamReader _readResponse=new System.IO.StreamReader(response.GetResponseStream());
            //The encrypted dynamics response in either xml or json
            var _responseAsString=_readResponse.ReadToEnd();
            JavaScriptSerializer parseResponse = new JavaScriptSerializer();

            List<Event> events = parseResponse.Deserialize<List<Event>>(_responseAsString);

            Event eventOjb = new Event();
            events.Add(eventOjb);

            ViewBag.eventss = events;

            _readResponse.Close();
            // check json object
            return Content(_responseAsString.ToString());  



        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
            //log error
        }
        return View();
    }

這是我在模型文件夾中的事件類

  using System;
  using System.Collections.Generic;
 using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;


 namespace StopMalaria.Models
 {
public class Event
{
    public string event_key { get; set; }
    public string user_token { get; set; }
    public string event_set_key { get; set; }
    public string event_type { get; set; }
    public string event_date { get; set; }
    public string event_amount { get; set; }
    public string event_location_key { get; set; }
    public string event_location_name { get; set; }
    public string event_location_city { get; set; }
    public string event_location_state { get; set; }
    public string event_location_country { get; set; }
    public string event_acknowledged { get; set; }
}

}

這是我的html試圖逐步瀏覽列表並創建表，並且錯誤消息出現在foreach循環上，提示“對象引用未設置為對象的實例”

 <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<dynamic>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    GetEvent
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">


   <table id="eventist" border="0" cellspacing="0" cellpadding="0">
    <thead>
        <tr>
            <th>
                event_key
            </th>
             <th>
                user_token
            </th>                
            <th>
                event_set_key
            </th>           
            <th>
                event_type
            </th>
             <th>
              event_date
            </th>
              <th>
                event_amount
            </th>
             <th>
                event_location_key
            </th>                
            <th>
                event_location_name
            </th>           
            <th>
                event_location_city
            </th>
             <th>
              event_location_state
            </th>
            <th>
                event_location_country
            </th>
             <th>
              event_acknowledged
            </th>
        </tr>
    </thead>
    <tbody>
    <%List<StopMalaria.Models.Event> events = new List<StopMalaria.Models.Event>();%>
    <%events = ViewBag.eventss;%>

    <% foreach (var item in events )
       { %>

        <tr>
            <td>
                <%: item.event_key%>
            </td>
            <td>
                  <%: item.user_token%>
            </td>               
            <td>
                <%: item.event_set_key%>
            </td>           
            <td>
                <%: item.event_type%>
            </td> 
             <td>
                <%: item.event_date%>
            </td>
            <td>
                  <%: item.event_amount%>
            </td>               
            <td>
                <%: item.event_location_key%>
            </td>           
            <td>
                <%: item.event_location_name%>
            </td> 
             <td>
                <%: item.event_location_city%>
            </td>
            <td>
                  <%: item.event_location_state%>
            </td>               
            <td>
                <%: item.event_location_country%>
            </td>           
            <td>
                <%: item.event_acknowledged%>
            </td>                   
        </tr>

    <% } %>
    </tbody>
    </table>






</asp:Content>

Answer 1

到底在哪里拋出異常？

從什么返回

 _readResponse.ReadToEnd();

嘗試反序列化響應后， events什么樣的？

最后，您確定這不會引起問題：

        Event eventOjb = new Event();
        events.Add(eventOjb);

沒有設置任何字符串屬性，這將導致空指針異常。