Xamarin 改装 - Newtonsoft.Json.JsonSerializationException

Question

我在 JSON 序列化方面遇到了一些问题。当我尝试反序列化我的 JSON 对象时，它 returns 我这个错误：

Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'Project.Models.BookModel' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.

我的问题是我必须以两种不同的方式反序列化我的对象：在 JSON 数组（例如 [1,2,3]）中提取“_id”，"user"和 "name"，然后在 JSON 数组中（例如 ["name":"value"]）提取 "books"。我不知道该怎么做。或者更准确地说，我不知道 Refit 是否可行。

这是我的 JSON :

[
{
    "_id": "5c014a1e43b6804ed7b642b2",
    "__v": 0,
    "user": "5c014a1d43b6804ed7b642b1",
    "name": "Favoris",
    "books": [
        {
            "_id": "5a8f12e16a16fa06d1f5b0cb",
            "title": "Harry Potter et la Chambre des Secrets",
            "author": {
                "_id": "5a8f12e16a16fa06d1f5b0bd",
                "name": "J K Rowling",
                "__v": 0
            },
            "literaryGenre": "Juvenile Fiction",
            "isbn": 9781781101049,
            "externalImage": "...",
            "__v": 0,
            "content": {
                "brief": "test1"
            }
        },
        {
            "_id": "5a8f12e16a16fa06d1f5b0d0",
            "title": "Harry Potter et la Coupe de Feu",
            "author": {
                "_id": "5a8f12e16a16fa06d1f5b0bd",
                "name": "J K Rowling",
                "__v": 0
            },
            "literaryGenre": "Juvenile Fiction",
            "isbn": 9781781101063,
            "externalImage": "...",
            "__v": 0,
            "content": {
                "brief": "test2"
            }
        }
    ]
}
]

这是我的代码：

public async void ViewLibrary()
    {
        IProjectApi response = ProjectRepository.Instance.ProjectApi;
        List<LibraryModel> library = await response.GetLibrary("5c014a1d43b6804ed7b642b1");

        this.LibraryItems = library;
    }

我的对象 LibraryModel :

public class LibraryModel
{
    public string _id { get; set; }

    public string user { get; set; }

    public string name { get; set; }

    public BookModel books { get; set; }
}

还有我的方法 GetLibrary :

    [Get("/api/library/user/{UserId}")]
Task<List<LibraryModel>> GetLibrary(string UserId);

Answer 1

在您的代码中的任何位置实施这些类并尝试使用这些类.

反序列化您的 json

public class Author
{
    public string _id { get; set; }
    public string name { get; set; }
    public int __v { get; set; }
}

public class Content
{
    public string brief { get; set; }
}

public class Book
{
    public string _id { get; set; }
    public string title { get; set; }
    public Author author { get; set; }
    public string literaryGenre { get; set; }
    public object isbn { get; set; }
    public string externalImage { get; set; }
    public int __v { get; set; }
    public Content content { get; set; }
}

public class RootObject
{
    public string _id { get; set; }
    public int __v { get; set; }
    public string user { get; set; }
    public string name { get; set; }
    public List<Book> books { get; set; }
}

Answer 2

Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'Project.Models.BookModel' because the type requires a JSON object (e.g. {"name":"value"})

在 json 中你的 BookModel 返回了多条记录，所以它应该被定义为 List<BookModel>.

在 LibraryModel 中尝试使用 public List<BookModel> books { get; set; }。

Xamarin 改装 - Newtonsoft.Json.JsonSerializationException

Xamarin Refit - Newtonsoft.Json.JsonSerializationException

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