EF代码优先-一对一的可选关系
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我想使用EF Code First在现有数据库中映射可选的一对一关系。
简单架构：
User
Username
ContactID
Contact
ID
Name
public class User
{
[Key]
public string Username { get; set; }
public int? ContactID { get; set; }
[ForeignKey(\"ContactID\")]
public virtual Contact Contact { get; set; }
}
public class Contact
{
[Key]
public int ID { get; set; }
public string Name { get; set; }
public virtual User User { get; set; }
}
modelBuilder.Entity<User>().HasOptional<Contact>(u=> u.Contact)
.WithOptionalDependent(c => c.User);
System.Data.Edm.EdmAssociationEnd: : Multiplicity is not valid in Role
\'User_Contact_Source\' in relationship \'User_Contact\'. Because the Dependent
Role properties are not the key properties, the upper bound of the multiplicity
of the Dependent Role must be *.
没有找到相关结果
已邀请:
1 个回复
懊毁暗
public class User { [Key] public string Username { get; set; } public virtual Contact Contact { get; set; } } public class Contact { [Key] public int ID { get; set; } public string Name { get; set; } public virtual User User { get; set; } } modelBuilder.Entity<User>() .HasOptional<Contact>(u => u.Contact) .WithOptionalDependent(c => c.User).Map(p => p.MapKey(\"ContactID\"));