Question

我正在尝试学习asp.net核心，我正在尝试实现像网站这样的reddit。

我想要做的是当调用subreddit时，我想加载管理员和特定subreddit的成员并将它们传递给viewmodel。

实现这一点我已经制作了两个表

public class MemberSubReddit
{
    public long SubRedditId { get; set; }
    public virtual SubReddit SubReddit { get; set; }

    public string UserId { get; set; }
    public virtual ApplicationUser ApplicationUser { get; set; }
}
// the names differ since I was trying to check if the problem is from naming conventions
public class AdminSubReddit
{
    public long SubRedditId { get; set; }
    public virtual SubReddit SubReddit { get; set; }

    public string AspNetUsersId { get; set; }
    public virtual ApplicationUser AspNetUsers { get; set; }
}

现在当我执行以下代码时：

var sub = _subRedditRepository.GetSingle(e => e.Name == name, s => s.Posts, s => s.Admins, s => s.Members);

SubRedditId和SubReddit对象在管理员和成员中加载，但对于User对象，仅加载UserId（AspNetUserId）并且不加载ApplicationUser。

这也是我的模型构建器代码（基于实体框架核心中的asp.net核心网站，不会自动处理多对多连接，你必须手动完成）：

modelBuilder.Entity<AdminSubReddit>()
             .HasKey(t => new { t.SubRedditId, t.AspNetUsersId });

        modelBuilder.Entity<MemberSubReddit>()
             .HasKey(t => new { t.SubRedditId, t.UserId });

        modelBuilder.Entity<MemberSubReddit>()
            .HasOne(us => us.ApplicationUser)
            .WithMany(ms => ms.MemberIn)
            .HasForeignKey(us => us.UserId);

        modelBuilder.Entity<MemberSubReddit>()
            .HasOne(ms => ms.SubReddit)
            .WithMany(ms => ms.Members)
            .HasForeignKey(ms => ms.SubRedditId);

        modelBuilder.Entity<AdminSubReddit>()
            .HasOne(us => us.AspNetUsers)
            .WithMany(ms => ms.AdminIn)
            .HasForeignKey(us => us.AspNetUsersId);

        modelBuilder.Entity<AdminSubReddit>()
            .HasOne(ms => ms.SubReddit)
            .WithMany(ms => ms.Admins)
            .HasForeignKey(ms => ms.SubRedditId);

所以请告诉我我做错了什么：D 因为我是新手，如果你能看到代码的任何结构问题，如果你指出它我会很高兴。

修改

public T GetSingle(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeProperties)
    {
        IQueryable<T> query = _context.Set<T>();
        foreach (var includeProperty in includeProperties)
        {
            query = query.Include(includeProperty);
        }

        return query.Where(predicate).FirstOrDefault();
    }

这是在控制器中调用的方法

ApplicationUser对象未加载多对多关系

0 个答案: