C# 实体类型需要定义主键

我有3个模型类（

Customer、Manager、technology

），它们继承自基类

Person

。

Id

键在

Person

基类中定义

当我尝试为

Customer

类生成控制器时，会出现一个错误，指示实体类型Customer必须具有主键

这是我的

个人

课程：

public class Person
{
    [Key]
    public int Id { get; }
    [EmailAddress]
    public string? Email { get; set; }
    public int? Cin { get; set; }
    public string? Address { get; set; }
    [Required]
    public string Name { get; set; }
    [Phone, Required]
    public int PhoneNumber { get; set; }

    public Person(int PhoneNumber, string Name, string Email = null, int? Cin = null, string Address = null)
    {
        this.PhoneNumber = PhoneNumber;
        this.Name = Name;
        this.Email = Email;
        this.Address = Address;
        this.Cin = Cin;
    }

    public Person()
    {
    }
}

public class Customer : Person
{
    public List<Device> CustomerDevices { get; set; }

    public Customer(int PhoneNumber, string Name, string Email = null, int? Cin = null, string Address = null)
        : base(PhoneNumber, Name, Email, Cin, Address)
    {
    }

    public Customer() : base()
    {
    }
}

这是我的

客户

课程：

public class Person
{
    [Key]
    public int Id { get; }
    [EmailAddress]
    public string? Email { get; set; }
    public int? Cin { get; set; }
    public string? Address { get; set; }
    [Required]
    public string Name { get; set; }
    [Phone, Required]
    public int PhoneNumber { get; set; }

    public Person(int PhoneNumber, string Name, string Email = null, int? Cin = null, string Address = null)
    {
        this.PhoneNumber = PhoneNumber;
        this.Name = Name;
        this.Email = Email;
        this.Address = Address;
        this.Cin = Cin;
    }

    public Person()
    {
    }
}

public class Customer : Person
{
    public List<Device> CustomerDevices { get; set; }

    public Customer(int PhoneNumber, string Name, string Email = null, int? Cin = null, string Address = null)
        : base(PhoneNumber, Name, Email, Cin, Address)
    {
    }

    public Customer() : base()
    {
    }
}

公共类客户：个人
{
公共列表CustomerDevices{get；set；}
公共客户（int电话号码、字符串名称、字符串电子邮件=null、int？Cin=null、字符串地址=null）
：base（电话号码、姓名、电子邮件、Cin、地址）
{
}
公共客户（）：基本客户（）
{
}
}

代码示例中的问题是您应该向

Id

属性添加set，以便实体框架可以设置自动生成的Id。

代码示例中的问题是您应该向

Id

属性添加set，因此实体框架可以设置自动生成的id。

我认为您的

id

属性需要一个setter

public int Id { get; }              // not work
public int Id { get; set; }         // work
public int Id { get; private set; } // also work

您可以更改类别

Person

public class Person
{
    [Key]
    public int Id { get; private set; }
    [EmailAddress]
    public string? Email { get; set; }
    public int? Cin { get; set; }
    public string? Address { get; set; }
    [Required]
    public string Name { get; set; }
    [Phone, Required]
    public int PhoneNumber { get; set; }

    public Person(int PhoneNumber, string Name, string Email = null, int? Cin = null, string Address = null)
    {
        this.PhoneNumber = PhoneNumber;
        this.Name = Name;
        this.Email = Email;
        this.Address = Address;
        this.Cin = Cin;

    }
    public Person()
    {

    }
}

---

我认为您的

id

属性需要一个setter

public int Id { get; }              // not work
public int Id { get; set; }         // work
public int Id { get; private set; } // also work

您可以更改类别

Person

public class Person
{
    [Key]
    public int Id { get; private set; }
    [EmailAddress]
    public string? Email { get; set; }
    public int? Cin { get; set; }
    public string? Address { get; set; }
    [Required]
    public string Name { get; set; }
    [Phone, Required]
    public int PhoneNumber { get; set; }

    public Person(int PhoneNumber, string Name, string Email = null, int? Cin = null, string Address = null)
    {
        this.PhoneNumber = PhoneNumber;
        this.Name = Name;
        this.Email = Email;
        this.Address = Address;
        this.Cin = Cin;

    }
    public Person()
    {

    }
}