Question

ForeignKeyAttribute不能在Interface上工作吗？

public class Client: CompanyForeignKeyMapper
{
     public int Client;
}

public class CompanyForeignKeyMapper
{
     [ForeignKeyAttribute("Company")]
     int ClientId;
}

此代码工作正常。但是当我将类CompanyForeignKeyMapper更改为接口

时

public interface ICompanyForeignKeyMapper


public class Client: ICompanyForeingKeyMapper --> changed to interface

该属性似乎不起作用。

Answer 1

当您在第二个示例中声明Client类时，它不再继承自CompanyForeignKeyMapper类，因此它将没有ClientId字段。如果您希望它继承自CompanyForeignKeyMapper并且要实现ICompanyForeingKeyMapper接口，请将其声明为：

public class Client: CompanyForeignKeyMapper, ICompanyForeingKeyMapper

或者，您可以将ClientId定义为接口的字段，在这种情况下，Client类必须实现它并可以向其添加自己的ForeignKeyAttribute：

public interface ICompanyForeignKeyMapper
{
    int ClientId;
}


public class Client: ICompanyForeignKeyMapper
{
    [ForeignKeyAttribute("Company")]
    int ClientId;
}

如何实现ForeignKey属性到接口

1 个答案: