c# - 使用 asp.net mvc 使用 stackexchange Api

Question

我想在我的 ASP.Net 应用程序中使用 StackExchange API。

我制作了模型、 Controller 和 View ，但它们无法正常工作。它一直给我以下错误:

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[TaskTrial2.Models.question]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

型号

public class question
{
    public List<string> tags { get; set; }
    public string link { get; set; }
    public owner owner { get; set; }
    public bool is_answered { get; set; }
    public long view_count { get; set; }
    public string last_activity_date { get; set; }
    public long score { get; set; }
    public long answer_count { get; set; }
    public string creation_date { get; set; }
    public string question_id { get; set; }
    public string title { get; set; }




}
public class owner {
    public string user_id { get; set; }
    public string reputation { get; set; }
    public string user_type  { get; set; }
    public string profile_image { get; set; }
    public string display_name { get; set; }
    public string link { get; set; }

}

Controller

    public ActionResult Index()
    {

        List<question> questions = null;

        HttpClientHandler handler = new HttpClientHandler();
        handler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
        using (var Client = new HttpClient(handler))
        {
            Client.BaseAddress = new Uri("https://api.stackexchange.com/");
            //HTTP GET
            Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/jason"));
            var response = Client.GetAsync("2.2/questions?site=stackoverflow");
            response.Wait();
            var result = response.Result;

            if (result.IsSuccessStatusCode)
            {
                var readTask = result.Content.ReadAsAsync<List<question>>();
                readTask.Wait();
                questions = readTask.Result;


            }

        }

        return View(questions);
    }

查看

@model IEnumerable<TaskTrial2.Models.question>
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
   }


<table cellpadding="2" cellspacing="2" border="0">
<tr>

    <th>link</th>

</tr>

@foreach (var item in Model)
{

    <tr>
        <td>
            @item.link
        </td>

    </tr>

}

Answer 1

当您的请求首先收到问题的包装器时，您正在尝试直接序列化为问题列表

public class StackResponseWrapper
{
    public List<Question> items { get; set;}
    public bool has_more {get; set; }
    public int quota_max { get; set; }
    public int quota_remaining { get; set; }
}

我没有研究响应的结构，但我猜这是一个分页包装器，可以制作成通用的，例如 ( StackResponseWrapper<Question> )，但我会让您调查一下。

反序列化 json 时的关键是确保结构与您要反序列化的内容相匹配