![](/img/trans.png)
[英]One to one relationship in Entity Framework 5.0 Code First Approach
[英]Entity framework code first approach - one to one relationship
我的模型关联是(我相信)一对一的:
public class Account
{
[Key]
[ForeignKey("BlockedAccount")]
public virtual Guid AccountId { get; set; }
public virtual string UserName { get; set; }
public virtual BlockedAccount BlockedAccount { get; set; }
}
public class BlockedAccount
{
[Key]
public virtual Guid BlockedAccountId { get; set; }
public virtual int BanLevel { get; set; }
public virtual DateTime BannedDate { get; set; }
public virtual DateTime ExpirationDate { get; set; }
public virtual string Reason { get; set; }
}
但是,当我尝试使用它时,程序崩溃,并且给了我以下异常:
INSERT语句与FOREIGN KEY约束“ FK_dbo.Accounts_dbo.BlockedAccounts_AccountId”冲突。 数据库“ Accounts”的表“ dbo.BlockedAccounts”的“ BlockedAccountId”列中发生了冲突。 该语句已终止。
我在这里做错了什么? 我希望AccountId
指向BlockedAccountId
。
您如何附加实体? 您不需要实际设置外键,只需将其附加到导航属性即可进行连接。 上面的模型中的这段代码对我有效:
public class Account
{
[Key]
[ForeignKey("BlockedAccount")]
public virtual Guid AccountId { get; set; }
public virtual string UserName { get; set; }
public virtual BlockedAccount BlockedAccount { get; set; }
}
public class BlockedAccount
{
[Key]
public virtual Guid BlockedAccountId { get; set; }
public virtual int BanLevel { get; set; }
public virtual DateTime BannedDate { get; set; }
public virtual DateTime ExpirationDate { get; set; }
public virtual string Reason { get; set; }
public BlockedAccount()
{
BannedDate = DateTime.Now;
ExpirationDate = DateTime.Now;
}
}
public class Model : DbContext
{
public DbSet<BlockedAccount> BlockedAccounts { get; set; }
public DbSet<Account> Accounts { get; set; }
}
class Program
{
static void Main(string[] args)
{
var b = new BlockedAccount()
{
BlockedAccountId = Guid.NewGuid()
};
var a = new Account();
a.BlockedAccount = b;
Model m = new Model();
m.Accounts.Add(a);
m.SaveChanges();
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.