Question

我有MVC框架用户表和我自己的社区表。我还有一个关系 CommunityUser 表。我实际上将CommunityUser表与社区表连接起来。这是我的社区类

public class Community
{
    [Key]
    public int CommunityID { get; set; }

    [Required]
    public string CommunityName { get; set; }

    [Required]
    public string CommunityDomain { get; set; }
    public string CommunityAbout { get; set; }
    public string CommunityLogo { get; set; }

    public int PrivacyID { get; set; }

    public string CommunityAdmin { get; set; }
    public virtual PrivacyLevel PrivacyLevel { get; set; }
    public virtual  ICollection<CommunityUser> CommunityUsers { get; set; }

    public Community()
    {
        CommunityUsers = new Collection<CommunityUser>();
    }
}

我想在索引页面上使用用户表和社区用户表。我创建了一个包含这两个表的 ProfileDataViewModel 。

public class ProfileDataViewModel
{
    public ApplicationUser User { get; set; }
    public List<CommunityUser> CommunitiesList { get; set; }
}

现在，当我在索引函数上使用此视图模型时，它会抛出异常。这是我的索引功能

public ActionResult Index()
{
    var thisUser = db.Users.Where(u => u.UserName == User.Identity.Name).SingleOrDefault();

    var myDashboard = new ProfileDataViewModel()
    {
        User = thisUser,
        CommunitiesList = db.CommunityUsers.Include(x => x.Community).Where(u => u.UserID==thisUser.Id).ToList()

    };
    return View(myDashboard);
}

在mvc中使用ViewModel来显示来自多个表的数据

0 个答案: