我在 MVC 应用程序中使用 ASP.NET Core Web API，但出现错误

Question

错误：

'无法将当前 JSON 数组（例如 [1,2,3]）反序列化为类型'Mvc_Web_Application.Models.PostViewModel

public class BlogController : Controller
{
    Uri baseAddress = new Uri("https://localhost:7181/api");

    private readonly HttpClient _client;

    public BlogController()
    {
        _client = new HttpClient();
        _client.BaseAddress = baseAddress;
    }

    [HttpGet]
    public IActionResult Index()
    {
        try
        {
            CustomActionResult < PostViewModel > posts = new CustomActionResult<PostViewModel>();
            HttpResponseMessage response = _client.GetAsync(_client.BaseAddress + "/Blog/GetBlogs").Result;

            if (response.IsSuccessStatusCode) 
            { 
                string data = response.Content.ReadAsStringAsync().Result;
                posts = JsonConvert.DeserializeObject <CustomActionResult<PostViewModel>>(data);
                return View(posts);
            }
        }
        catch
        {
            throw new NotImplementedException();
        }

        return View();
    }
}

我有一个自定义模型

CustomActionResult

，它在我尝试过的数据末尾添加了“is-success”和“消息”

CustomActionResult<PostViewModel>

，但它也不起作用。

我的数据格式是这样的：

{
    "data": 
       [
        {
            "title": "test1",
            "body": "body",
            "author": null,
            "id": 1,
            "createdDate": "0001-01-01T00:00:00",
            "updatedDate": "0001-01-01T00:00:00"
        },
        {
            "title": "test1",
            "body": "body1",
            "author": null,
            "id": 2,
            "createdDate": "0001-01-01T00:00:00",
            "updatedDate": "0001-01-01T00:00:00"
        }
     ],
     "isSuccess": true,
     "message": null
}

PostViewModel：

public class CustomActionResult
{
    public bool IsSuccess { get; set; }
    public string Message { get; set; }
}

public class CustomActionResult<T> : CustomActionResult
{
    public T Data { get; set; }
}

自定义操作结果：

public class CustomActionResult
{
    public bool IsSuccess { get; set; }
    public string Message { get; set; }
}

public class CustomActionResult<T> : CustomActionResult
{
    public T Data { get; set; }
}

Answer 1

您面临的错误是将 JSON 数组反序列化为单个对象。

我更新了下面的代码。

[HttpGet]
public IActionResult Index()
{
    try
    {
        HttpResponseMessage response = _client.GetAsync(_client.BaseAddress + "/Blog/GetBlogs").Result;

        if (response.IsSuccessStatusCode) 
        { 
            string data = response.Content.ReadAsStringAsync().Result;
            
            CustomActionResult<List<PostViewModel>> posts = JsonConvert.DeserializeObject<CustomActionResult<List<PostViewModel>>>(data);

            return View(posts);
        }
    }
    catch
    {
        throw new NotImplementedException();
    }

    return View();
}