Question

我需要与Identity表和Custom表建立多对多的关系我在answer中使用了相同的逻辑但问题是我无法在新的多对多表中添加任何内容

这是我自己的代码

ApplicationUser

public class ApplicationUser : IdentityUser
{
    public ApplicationUser()
    {
        subjects = new HashSet<subject>();
    }

    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
        return userIdentity;
    }
    public virtual ICollection<subject> subjects { get; set; }
}

主题

 public class subject
    {        
        public int subjectId { get; set; }
        public string subjectCode { get; set; }
        public virtual ICollection<ApplicationUser> buyers { get; set; }
    }

我厌倦了添加实体的功能假设接收用户和subjectCode的电子邮件，并在表格中将用户和主题链接在一起

public ActionResult addBuyer(FormCollection fc)
{
    ApplicationUser tst = _context.Users.FirstOrDefault(b => b.Email.Equals(fc["Email"].ToString()));
    var temp = _context.subjects.Include("buyers").Where(c => c.subjectCode.Equals(fc["SubCode"].ToString()) );
    temp.First().buyers.Add(tst);
    return RedirectToAction("Index");
}

，这是错误

An exception of type 'System.NotSupportedException' occurred in EntityFramework.SqlServer.dll but was not handled in user code

Additional information: LINQ to Entities does not recognize the method 'System.String get_Item(System.String)' method, and this method cannot be translated into a store expression.

如何使用Identity表和Custom表更新Asp.Net MVC 5中的Many to Many表

0 个答案: