使用带有字符串主键和一对多关系的数据库优先方法在 ASP.NET 核心中不起作用 Web API

Question

我有两个 model 类：

public partial class customer
{
    public string customer_id { get; set; }   // Primary Key
    public string customer_name { get; set; }
    public string course_mobile { get; set; }

    public  List<customer_address> customer_addresses { get; set; }
}

public partial class customer_address
{
    public string address_id { get; set; }    // Primary Key
    public string adreess { get; set; }
  
    public  customer customer { get; set; }
    public string customer_id { get; set; }   // Foreign Key
}

我得到一个错误：

实体类型“客户”需要定义主键。

那怎么解决呢？

数据库表结构

Answer 1

您需要添加[Key]属性。

public partial class customer
{
    [Key]
    public string customer_id { get; set; }   // Primary Key
    public string customer_name { get; set; }
    public string course_mobile { get; set; }

    public  List<customer_address> customer_addresses { get; set; }
}

public partial class customer_address
    {
        [Key]
        public string address_id { get; set; } // Primary Key
        public string adreess { get; set; }


        public customer customer { get; set; }
        
        public string customer_id { get; set; }  // Foriegn Key
    }