使用NET Framework 3.5解析JSON。无法从对象获取数据 [英] Parse JSON with NET Framework 3.5. Can't get data from object

问题描述

我只是无法获取json中嵌入对象的键和值。
我想获取这些键和值，例如 {user：‘admin’，msg：‘exit’} 。
通过此代码，我获得了item.Key（即json中的ID）和item.Value（System.Collections.Generic.Dictionary`2 [System.String，System.Object]）
但是我只是不知道该对象做什么。如何从中获取数据？
我从服务器获取json-

I just can't get key and value for embedded object in json. I want to get these keys and values like { user: 'admin', msg: 'exit' }. With this code I get item.Key (that is id in that json) and item.Value (System.Collections.Generic.Dictionary`2[System.String,System.Object]) But I just don't know what to do with this object. How to get data from it? I get json from server -

{
    "365": {
        "user": "admin",
        "msg": "exit"
    },
    "366": {
        "user": "user",
        "msg": "enter"
    },
    "370": {
        "user": "user",
        "msg": "exit"
    },
    "372": {
        "user": "user",
        "msg": "exit"
    },
    "373": {
        "user": "admin",
        "msg": "exit"
    }
}

谢谢您的回答。

PS
我不想使用任何外部库。

P.S. I don't want to use any external libs.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Web.Script.Serialization;

namespace JSONTestconsole
{
    class Program
    {
        static void Main(string[] args)
        {
            WebClient wc = new WebClient();
            wc.Proxy = null;
            string data = wc.DownloadString("http://temp.net");

            JavaScriptSerializer ser = new JavaScriptSerializer();
            var obj = ser.DeserializeObject(data) as ICollection;
            foreach (KeyValuePair<string, object> item in obj)
            {
                var id = item.Key;
                Console.WriteLine(id);
                Console.WriteLine(item.Value);
            }

            Console.ReadLine();
        }
    }
}

推荐答案

您正在反序列化到 Object ，该对象不会公开值属性。 json表示已序列化的对象，因此最好将其反序列化为相同的类型：

You are deserializing to Object which wont expose the value properties. json represents a serializied object, so it is better to deserialize to the same Type:

public class UserMsg
{
    public string user { get; set; }
    public string msg { get; set; }
}

将其用作值目标类型：

string jstr = ...from whereever
JavaScriptSerializer jss = new JavaScriptSerializer();
Dictionary<string, UserMsg> myCol = jss.Deserialize<Dictionary<string, UserMsg>>(jstr);

// test result:
foreach (KeyValuePair<string, UserMsg> kvp in myCol)
{
    Console.WriteLine("Key: {0}", kvp.Key);
    Console.WriteLine("  Value: {0}, {1}", kvp.Value.user, kvp.Value.msg);
}

输出：

键：365

值：admin，退出

键：366

值：用户，输入

（etc）

Key: 365
Value: admin, exit
Key: 366
Value: user, enter
(etc)

VS将有助于创建此类：将有效的json放在剪贴板上；然后

编辑菜单->选择性粘贴->将Json粘贴为类。

VS will help make the class: put the valid json on the clipboard; then
Edit Menu -> Paste Special -> Paste Json as Class.

您可能需要调整一些内容。我认为是在VS2010中添加了此功能。

You may have to tweak a few things. I think it was VS2010 where this feature was added.

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