首先，我展示我的db相关类：

DbContext.cs

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

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
                optionsBuilder.UseNpgsql("Server=localhost;Port=5432;User Id=postgres;Password=password;Database=db");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder) 
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.Entity<Place>()
                .HasOne(p => p.Address)
                .WithOne(ad => ad.Place)
                .HasForeignKey<Address>(ad => ad.PlaceId)
                .OnDelete(DeleteBehavior.Cascade);
        }

        public DbSet<Place> Places { get; set; }
        public DbSet<Address> Addresses { get; set; }
    }

字符串

Program.cs

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddDbContext<BookingDbContext>();

builder.Services.AddTransient<IPlaceService, PlaceService>();
builder.Services.AddTransient<IPlaceRepository, PlaceRepository>();

builder.Services.AddControllers().AddJsonOptions(options => options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles);

var app = builder.Build();

app.MapGet("/", () => "Hello World!");

app.UseHttpsRedirection();

app.MapControllers();

app.Run();

型
我像往常一样创建了CRUD方法，所以添加，删除，更新和获取。前3个方法没有问题，只有GET失败。我得到一个错误消息：

System.InvalidOperationException: No database provider has been configured for this DbContext. 
A provider can be configured by overriding the 'DbContext.OnConfiguring' method or by using 'AddDbContext' on the application service provider. 
If 'AddDbContext' is used, then also ensure that your DbContext type accepts a DbContextOptions<TContext> object in its constructor and passes it to the base constructor for DbContext.

型
你知道这是什么原因吗？就像我之前说的-当我添加，删除一些东西到数据库，从数据库，一切都很好。只有对于get方法，我得到了这样的错误。
编辑：

public async Task<IEnumerable<Place>> GetPlaces(bool includeAddress)
{
    if (includeAddress)
    {
       return await _dbContext.Places.Include(a => a.Address).ToListAsync();
    }
    else
    {
        return await _dbContext.Places.ToListAsync();
    }
}

public async Task<Place> GetById(int id)
{
   Place? place = await _dbContext.Places
                .Where(p => p.Id == id)
                .Include(p => p.Address)
                .FirstOrDefaultAsync();

   return place ?? throw new KeyNotFoundException($"Place with id: {id} not found.");
}

型