c# – 实体核心查询在急切加载导航属性时仅返回一个项目

使用Entity Core创建一个简单的restful Web API.我遇到的问题是,当使用简单的context.Users.ToListAsync()查询时,我收到数据库中所有用户的列表,但是,当加载一对一关系导航属性时(context.Users.Include( u => u.Status).ToListAsync(),我总是只收到我数据库中的第一项.

以下是我的Code First型号：

public class User
{        

    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FullName { get { return LastName + "," + FirstName; } }
    public string Email { get; set; }
    public string Avatar { get; set; }
    public string GUID { get; set; }
    public string InternalId { get; set; }

    // Foreign keys and navigation properties
    public virtual UserStatus Status { get; set; }
}

public class UserStatus
{
    public int Id { get; set; }
    public string Name { get; set; }

    // Foreign keys and navigation properties
    public virtual List<User> Users { get; set; }
}

每个用户必须具有用户状态.用户状态应该是可能状态状态的表.将有许多用户具有单一状态类型.这是我流利的映射：

protected override void OnModelCreating(ModelBuilder modelBuilder)
    {

        // Users
        modelBuilder.Entity<User>()
            .HasAlternateKey(p => p.GUID);

        modelBuilder.Entity<User>()
            .HasAlternateKey(p => p.InternalId);

        modelBuilder.Entity<User>()
            .HasAlternateKey(p => p.Email);

        modelBuilder.Entity<User>()
            .Property(p => p.FirstName)
            .HasMaxLength(40)
            .IsRequired();

        modelBuilder.Entity<User>()
            .Property(p => p.LastName)
            .HasMaxLength(40)
            .IsRequired();

        modelBuilder.Entity<User>()
            .Property(p => p.Email)
            .HasMaxLength(250)
            .IsRequired();

        modelBuilder.Entity<User>()
            .HasOne(p => p.Status)
            .WithMany(s => s.Users)
            .HasForeignKey("StatusId")
            .OnDelete(Microsoft.EntityFrameworkCore.Metadata.DeleteBehavior.Restrict);

        // User Status
        modelBuilder.Entity<UserStatus>()
            .Property(s => s.Name)
            .HasMaxLength(40)
            .IsRequired();

    }

这是我正在测试的简单数据初始化：

List<UserStatus> status = new List<UserStatus>();

        status.Add(new UserStatus { Name = "Invited" });
        status.Add(new UserStatus { Name = "Registered" });
        status.Add(new UserStatus { Name = "Verified" });
        status.Add(new UserStatus { Name = "Deactivated" });

        foreach (UserStatus s in status)
        {
            context.UserStatus.Add(s);
        }
        context.SaveChanges();

        List<User> users = new List<Users>();

        users.Add(new User {
            FirstName = "Jack",LastName = "Test",Email = "JackTest@aol.com",GUID = "TEST001",InternalId = "00001",Status = status[0]
        });
        users.Add(new User
        {
            FirstName = "Jane",LastName = "Tester",Email = "JaneTester@gmail.com",GUID = "TEST002",InternalId = "00002",Status = status[1]
        });

        foreach (User u in users)
        {
            context.Users.Add(u);
        }
        context.SaveChanges();

在我的web API控件中,纯粹用于测试,我正在执行以下操作：

[HttpGet]
    public async Task<IActionResult> Get()
    {
        var users = await context.Users
            .ToListAsync();
        return new OkObjectResult(users);
    }

这很好用.我得到了一个用户列表.但如果我这样做：

[HttpGet]
        public async Task<IActionResult> Get()
        {
            var users = await context.Users
                .Include(u => u.Status)
                .ToListAsync();
            return new OkObjectResult(users);
        }

我只获得了数据库中的第一个条目.如果我这样做：

[HttpGet]
        public async Task<IActionResult> Get()
        {
            var users = await context.Users
                .Include(u => u.Status)
                .LastAsync();
            return new OkObjectResult(users);
        }

而不是第一个条目,我得到了最后一个,这意味着我可以使用整个列表,至少直到ToListAsync调用.

有人能告诉我我做错了什么吗？一对一关系是否设置错误？ ym数据初始化？我无法想出这个.

非常感谢你的时间！