Question

我正在尝试在实体框架代码中创建一个数据库，但我总是得到这样的错误：

InvalidOperationException：无法将表'Device'用于实体类型 'IpMac'，因为它被用于实体类型'Device'，主键{'DeviceIP'}和主键{'DeviceID'}之间没有任何关系。“

这些是我的模特课：

$query = "SELECT t1.Ia f1, t2.Ia f2, t1.Ia+t2.Ia added_values, t1.time,t2.time 
        from ".$tbl1." t1 INNER JOIN ".$tbl2." t2
        ON CONVERT(char(10), t1.datetime,126) = CONVERT(char(10), t2.datetime,126)
        where CONVERT(char(10), t1.datetime,126) = '".$date."';";

这是我的“DbContext”类：

public class IpMac
{
    [Key]
    public string DeviceIP { get; set; }
    //[ForeignKey("Device")]
    public int DeviceID { get; set; }
    public string DeviceMAC { get; set; }

    //public Device Device { get; set; }
    public ICollection<Device> Device { get; set; }
}
public class Device
{
    //[Key]
    public int DeviceID { get; set; }
    public string DeviceName { get; set; }
    public string UserName { get; set; }
    //public string DeviceMAC { get; set; }

    public IpMac IpMac { get; set; }
}

Answer 1

您的设备上下文不应该为表使用不同的表名吗？

public class DeviceContext : DbContext
{
    public DeviceContext(DbContextOptions<DeviceContext> options) : base (options)
    {
    }

    public DbSet<Device> Devices { get; set; }
    public DbSet<IpMac> IpMacs { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
      modelBuilder.Entity<IpMac>().ToTable("IpMac");
      modelBuilder.Entity<Device>().ToTable("Device");
      Logger.Log("DeviceContext: Database & Tables SET.");
    }
}

InvalidOperationException：无法将表'xxxx1'用于实体类型'xxxx2'，因为它用于实体类型'xxxx1'

1 个答案: