Question

我有两个实体

BusinessUser { Id(PK), Name,...}

Login { BusinessUserID(PK, FK), Email, Password, etc...}

BusinessUser与Login之间的关系为一对一/一。

我正在进行以下配置在BusinessUser EF配置类

中

this.HasOptional(bu => bu.LoginInfo)
    .WithOptionalPrincipal(l => l.BusinessUser);

在登录EF配置类

中

this.HasRequired(l => l.BusinessUser)
    .WithOptional(bu => bu.LoginInfo);

我遇到了异常

已配置在“登录”类型上声明的导航属性“BusinessUser” 具有相互冲突的多重性。

我首先在EF 4.1代码中使用一对一/零配置错误。

更新1 ：以下是我的班级结构

public class BusinessUser {
    public virtual int ID { get; set; }

    public virtual int BusinessID { get; set; }

    public virtual Business Business { get; set; }

    public Login LoginInfo { get; set; }
  }

 public class Login {
    public virtual int BusinessUserID { get; set; }

    public virtual string Email { get; set; }

    public virtual string Password { get; set; }

    public BUsinessUser BusinessUserInfo { get; set; }
  }

我也在寻找双向的。

Answer 1

您的BusinessUser必须将关系配置为：

this.HasOptional(bu => bu.LoginInfo)
    .WithRequired(l => l.BusinessUser);

两个配置必须相同（实际上只需要一个）并且第一个配置不正确，因为它试图定义0..1 - 0..1关系。

Answer 2

你是如何构建课程的？这是一个定义为一对一/零关系的样本。结果是：

BusinessUser {Id（PK），Name，...}

登录{BusinessUserID（PK，FK），电子邮件，密码等...}


public class BusinessUser
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public virtual LoginInfo LoginInfo { get; set; }
} 

public class LoginInfo
{
    public int BusinessUserId { get; set; }
    public virtual BusinessUser BusinessUser { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
}

这是DbContext和Initializer



public class MyContext : DbContext
{

    public DbSet<BusinessUser> BusinessUsers { get; set; }
    public DbSet<LoginInfo> LoginInfos { get; set; }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        //We define the key for the LoginInfo table
        modelBuilder.Entity<LoginInfo>().HasKey(x => x.BusinessUserId);
        modelBuilder.Entity<LoginInfo>().HasRequired(bu => bu.BusinessUser);
    }
}

public class MyInitializer : DropCreateDatabaseIfModelChanges<MyContext>
{
    protected override void Seed(MyContext context)
    {
        var businessUser = new BusinessUser();
        businessUser.Email = "mymail@email.com";
        businessUser.Name = "My Name";
        businessUser.LoginInfo = new LoginInfo(){Username = "myusername", Password ="mypassword"};
        context.BusinessUsers.Add(businessUser);
        context.SaveChanges();
    }
}

实体框架4.1：在“登录”类型上声明的导航属性“BusinessUser”已配置了冲突的多重性

2 个答案: