数组反序列化不支持该类

Question

我收到一个错误：

System.InvalidOperationException：数组反序列化不支持类型“ VK.Response”。

我得到的JSON看起来像：

{“响应”：[{“ id”：269058571，“ first_name”：“ Name”，“ last_name”：“ LastName”，“ photo_50”：“ http://cs624717.vk.me/v624717571/21718/X8。 jpg“}]}

我的方法是：

 private void getFriendInfo()
    {
        string method = "users.get";
        string param = "user_ids=269058571&fields=photo_50";
        string url = "https://api.vk.com/method/" + method + "?" + param + "&v=5.31&access_token=" + key + "";

        WebClient client = new WebClient();

        string json = client.DownloadString(url);
        JavaScriptSerializer json_serializer = new JavaScriptSerializer();
        RootObject response = (RootObject)json_serializer.Deserialize(json, typeof(RootObject));
        for (int counter = 0; counter < response.response.items.Count; counter++)
        {
            pictureBox1.Load(response.response.items[counter].photo_50);
        }
    }

类：

      class Response
        {
            public int count { get; set; }
            public List<Item> items { get; set; }
        }

       class RootObject
       {
            public Response response { get; set; }
       }
       class Item
       {
            public string first_name { get; set; }
            public string last_name { get; set; }
            public string domain { get; set; }
            public string photo_50 { get; set; }
       }

Answer 1

尝试像这样声明您的“ RootObject”类：

class RootObject
       {
            public List<Response> response { get; set; }
       }

Answer 2

您的对象模型未与json对齐。 尝试一下（我现在使用的是Newtonsoft.Json，它是当今的标准JSON库，而不是带有.Net的库）。使用nuget包管理器来获取它... https://www.nuget.org/packages/ newtonsoft.json / ：

using System;
using System.Collections.Generic;
using Newtonsoft.Json;

public class Program
{
    public static void Main()
    {
        var json = "{\"response\":[{\"id\":269058571,\"first_name\":\"Name\",\"last_name\":\"LastName\",\"photo_50\":\"http://cs624717.vk.me/v624717571/21718/X8.jpg\"}]}";

        var obj = JsonConvert.DeserializeObject<RootObject>(json);

        foreach(var item in obj.response) {
            Console.WriteLine(item.first_name);
        }           
    }
}

class RootObject
{
    public List<Item> response { get; set; }
}
class Item
{
    public string first_name { get; set; }
    public string last_name { get; set; }
    public string domain { get; set; }
    public string photo_50 { get; set; }
}

实时示例： https ： //dotnetfiddle.net/WJwvm3