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C# REST API - 返回一个数组为 Z0ECD11C1D7A287401D148A23BBD7A2

[英]C# REST API - returning an array as JSON

I'm trying to build a REST API.我正在尝试构建 REST API。 I have been using this guide by Microsoft Docs and I'd appreciate some help.我一直在使用 Microsoft Docs 的本指南,希望能得到一些帮助。

I have 2 models Library and Book.我有 2 个模型库和书籍。 Each have their own controllers as well.每个人都有自己的控制器。

I want each to reference each other so I can get all books within a library and I want a book to reference what library it belongs to.我希望每个人都能相互引用,这样我就可以获取图书馆中的所有书籍,并且我想要一本书来引用它所属的图书馆。 I am using an in-memory database by Microsoft Entity Framework我正在使用 Microsoft Entity Framework 的内存数据库

My current model classes look like this:我当前的 model 类如下所示:

Library:图书馆:

    public class Library
    {
        [Key]
        public long id { get; set; }
        public Book[] bookArray { get; set; }
        public string postalCode { get; set; }
        public string street { get; set; }
        public string city { get; set; }
        public string country { get; set; }
    }

Book:书:

public class Book
    {
        [Key]
        public long id { get; set; }
        public long libraryId { get; set; }
        public string title { get; set; }
        public string author { get; set; }
        public string description { get; set; }
    }

I want a GET endpoint like so "api/Libraries/{id}/books" that will return the array of books within a library as JSON, but I can't return the array.我想要一个像“api/Libraries/{id}/books”这样的 GET 端点,它将图书馆内的书籍数组返回为 JSON,但我无法返回该数组。 I get the error "Can't implicitly convert Models.Book to Microsoft.AspNetCore.Mvc.ActionResult<A2.Models.Library>".我收到错误“无法将 Models.Book 隐式转换为 Microsoft.AspNetCore.Mvc.ActionResult<A2.Models.Library>”。 Have I setup the model classes correctly?我是否正确设置了 model 类? and how do I resolve this error.以及如何解决此错误。

The Code:编码:

      // GET: api/Libraries/5/books
        [HttpGet("{id}/books")]
        public async Task<ActionResult<Library>> GetLibraryBooks(long id)
        {
            var library = await _context.Libraries.FindAsync(id);

            if (library == null)
            {
                return NotFound();
            }

            return library.bookArray;
        }

Your Method should return Book[] like this:您的方法应该像这样返回Book[]

[HttpGet("{id}/books")]
    public async Task<ActionResult<Book[]>> GetLibraryBooks(long id)
    {
        var library = await _context.Libraries.FindAsync(id);

        if (library == null)
        {
            return NotFound();
        }

        return Ok(library.bookArray);
    }

UPDATE更新

public class Library
{
    public Libary(){
         books = new List<Book>();
    }

    [Key]
    public long id { get; set; }
    public List<Book> books { get; set; }
    public string postalCode { get; set; }
    public string street { get; set; }
    public string city { get; set; }
    public string country { get; set; }
}

UPDATE 2更新 2

    public class LibraryController : Controller
{
    private readonly LibraryContext _context;

    public LibraryController(LibraryContext context)
    {
        _context = context;
    }

    [HttpPost("{id}")]
    public IActionResult AddBookToLibrary([FromRoute]long id ,[FromBody] Book bookToAdd)
    {
        var libraryToAddBook = _context.Libraries.Include(l => l.books)
                                                 .FirstOrDefault(l => l.id == id);

        if (libraryToAddBook == null)
            return NotFound();

        libraryToAddBook.books.Add(bookToAdd);
        _context.SaveChanges();

        return Ok();
    }
}

UPDATED CONTEXT更新的上下文

    public class LibraryContext : DbContext
{
    public LibraryContext(DbContextOptions<LibraryContext> options)
        : base(options)
    {

    }

    public DbSet<Library> Libraries { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Library>()
            .OwnsMany<Book>(l => l.books);
    }

}

startup.cs启动.cs

            var connectionString = Configuration.GetConnectionString("myDatabaseConnectionString");
        services.AddDbContext<LibraryContext>(options =>
        {
            //options.USEYOURDATABASE(connectionString); //you might need install a NuGet eg. Microsoft.EntityFrameworkCore.SqlServer
        });

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