Question

我当然是在深水中，虽然我一直在寻找许多“类似”的帖子，但我似乎无法想象这一点。

我正在尝试与“公司模型”和ApplicationUser建立连接。该公司拥有许多AU，AU可以拥有许多公司。虽然当我创建一个公司并从selectList中选择不同的用户时（我检查过，确实传递了AU-ID。

警告：我只是一个菜鸟，我在跟踪指南时遇到了很多问题，但是没有 - 所以可能会有明显的错误。

模特公司：

 public Company()
    {
        this.Users = new List<ApplicationUser>();
    }
    public int ID { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public string Zip { get; set; }
    public string City { get; set; }
    public string Cvr { get; set; }
    public string Telephone { get; set; }
    public string Email { get; set; }
    public string Website { get; set; }
    public string BillingEmail { get; set; }
    [ForeignKey("UserId")]
    public List<string> UserId { get; set; }
    public virtual List<ApplicationUser> Users { get; set; }
}

模型ApplicationUser

  public class ApplicationUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        userIdentity.AddClaim(new Claim("FirstName", this.FirstName.ToString()));
        userIdentity.AddClaim(new Claim("LastName", this.LastName.ToString()));
        return userIdentity;
    }
    public ApplicationUser()
    {
        this.Companies = new List<Company>();
    }

    public string FirstName { get; set; }
    public string LastName { get; set; }
    public virtual List<Company> Companies { get; set; }
}

控制器

 [HttpPost]
    public async Task<ActionResult> CreateCompany(CreateCompanyViewModel model)
    {

        if (ModelState.IsValid)
        {


            DAL.CompanyContext context = new DAL.CompanyContext();

            // Creating object from recieved form
            DomainModels.Company newCompany = new DomainModels.Company();


            newCompany.Address = model.Address;
            newCompany.BillingEmail = model.BillingEmail;
            newCompany.City = model.City;
            newCompany.Cvr = model.Cvr;
            newCompany.Email = model.Email;
            newCompany.Name = model.Name;
            newCompany.Telephone = model.Telephone;
            newCompany.Website = model.Website;
            newCompany.Zip = model.Zip;
            newCompany.UserId = model.SelectedApplicationUserId;
            // adding and saving
            context.Companies.Add(newCompany);
            await context.SaveChangesAsync();

            return RedirectToAction("Index");
        }
        return View(model);

    }

的DbContext

 public DbSet<Company> Companies { get; set; }
    protected override void OnModelCreating(DbModelBuilder mb) 
    {
        base.OnModelCreating(mb);
        mb.Entity<Company>() 
            .HasMany(c => c.Users)
            .WithMany(d =>d.Companies)
            .Map(m=>
            {
            m.MapLeftKey("Company_ID");
            m.MapRightKey("ApplicationUser_Id");
            m.ToTable("CompanyApplicationUsers");
            });
    }

    }

我真的很困惑。搜索谷歌，我发现很多帖子表明我需要创建一个OnModelCreate，虽然我认为EF会自动执行此操作 - 请注意，它自动创建了一个表，其中包含“CompanyApplicationUsers”表（这就是我使用这些信息的原因））。

每次都会创建公司，但没有任何内容发布到关系表中。

我有一种感觉，我在这里乱搞 - 我希望我会学习！：）

感谢您的帮助。

更新1：

我更改了模型，而是指向ApplicationUser（Users）作为外键。我遍历我从视图中收到的ID列表，并创建一个用户并将这些添加到newCompany List ..

然而，虽然我不确定这是否正确，但我还在Context.savechanges上收到验证错误“一个或多个实体的验证失败”

此处的错误与我创建的用户填写列表有关 - 它们需要一些其他信息，例如用户名。请注意，我只想要关系，而不是创建实际用户。

       [HttpPost]
    public async Task<ActionResult> CreateCompany(CreateCompanyViewModel model)
    {

        if (ModelState.IsValid)
        {


            DAL.CompanyContext context = new DAL.CompanyContext();

            // Creating object from recieved form
            DomainModels.Company newCompany = new DomainModels.Company();


            newCompany.Address = model.Address;
            newCompany.BillingEmail = model.BillingEmail;
            newCompany.City = model.City;
            newCompany.Cvr = model.Cvr;
            newCompany.Email = model.Email;
            newCompany.Name = model.Name;
            newCompany.Telephone = model.Telephone;
            newCompany.Website = model.Website;
            newCompany.Zip = model.Zip;
            foreach (string i in model.SelectedApplicationUserId)
            {
                ApplicationUser user = new ApplicationUser();
                user.Id = i;
                newCompany.Users.Add(user);
            }
            //newCompany.Users = model.SelectedApplicationUserId;
            // adding and saving
            context.Companies.Add(newCompany);
            await context.SaveChangesAsync();

            return RedirectToAction("Index");
        }
        return View(model);

    }

更新2

现在生病与1对多关系，我可以工作。在这种情况下，我只需使用每个关联用户的CompanyID更新ApplicationUser。我仍然想知道如何创建多对多，也许是我在这里做的一些，也是需要的。但我无法弄明白。

    //newCompany.Users = model.SelectedApplicationUserId;
            // adding and saving

            context.Companies.Add(newCompany);
            try
            {
               int response = await context.SaveChangesAsync();
            }
            catch(Exception exception)
            {

            }

            foreach (string i in model.SelectedApplicationUserId)
            {
                var user = await UserManager.FindByIdAsync(i);
                user.CompanyId = newCompany.ID;
                IdentityResult result = await UserManager.UpdateAsync(user);
            }
            try
            {

            }
            catch (Exception exception)
            {
                throw;
            }

            return RedirectToAction("Index");
        }
        return View(model);

Answer 1

您应该可以使用正确配置的类执行类似的操作：

var userList = new List<ApplicationUser>();
foreach (string i in model.SelectedApplicationUserIds)
{
    userList.Add(new ApplicationUser {Id = i});
}

var newCompany = new Company
{
    Address = model.Address;
    BillingEmail = model.BillingEmail;
    City = model.City;
    // etc. 
    Users = userList
};

int response = await context.SaveChangesAsync();

EF会自动建立联系。请注意，您不需要使用UserManager来检索用户 - 它可以从context.Users。

获得

Asp.net C＃多对多关系EF ApplicationUser

1 个答案: