你好,我正在创建一个Web应用程序,并且已经安装了Microsoft.entityFrameworkCore和Microsoft.entityFrameworkCore.Tools.
在package manager控制台中执行添加迁移的过程中,我遇到了一个错误
"System.InvalidOperationException: Entity type 'Attends' has composite primary key defined with data annotations. To set composite primary key, use fluent API"
以下是我在Entity文件夹中的代码.
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;
namespace _3241_farmDb.Entities
{
public class Farm
{
[Required, MaxLength(30)]
[Key]
public string FarmName { get; set; }
[Required, MaxLength(15)]
public string FarmCity { get; set; }
[Required, MaxLength(9)]
public string FarmerSSN { get; set; }
}
public class Farmer
{
[Required, MaxLength(9)]
[Key]
public int SS { get; set; }
[Required, MaxLength(9)]
public string Fname { get; set; }
[Required, MaxLength(15)]
public string Lname { get; set; }
[Required, MaxLength(15)]
public string CityName { get; set; }
[Required, MaxLength(15)]
public string Address { get; set; }
[Required, MaxLength(30)]
public string BoardPositionName { get; set; }
}
public class Child
{
[Required, MaxLength(9)]
[Key]
public int FarmerSS { get; set; }
[Required, MaxLength(15)]
[Key]
public string Fname { get; set; }
[Required, MaxLength(15)]
[Key]
public string Lname { get; set; }
[Required]
public int Age { get; set; }
}
public class Attends
{
[Key, Column(Order = 1)]
public int FarmerSS { get; set; }
[Key, Column(Order = 2)]
public int HotelID { get; set; }
[Required, MaxLength(15)]
public string BoardPosition { get; set; }
}
public class Livestock
{
[Required, MaxLength(15)]
public int LivestockID { get; set; }
[Required, MaxLength(15)]
public string LivestockType { get; set; }
}
public class Farm_Houses
{
[Required, MaxLength(15)]
[Key]
public int LivestockID { get; set; }
[Required, MaxLength(15)]
public string FarmName { get; set; }
}
public class Crops
{
[Required, MaxLength(15)]
[Key]
public int CropID { get; set; }
[Required, MaxLength(15)]
public string CropName { get; set; }
}
}
如何调整它以正确设置复合关键点?