C#.NET设计模式问题

Question

我正在尝试实现最佳代码重用性.问题是我无法通过存储库访问位于主程序的Base Abstract类中的基本方法.

如果您通过下面的示例,您将看到我的情况的示例代码.

所以我的问题是如何从主程序访问基本抽象类中的方法.

类/接口

public abstract class BaseEntity
{
    public override abstract String ToString();
}

public abstract class BaseClass<T> where T : BaseEntity
{
    public T GetById(int id)
    {
        //Dummy Code
        return new T();
        //
    }
}

public interface IFooRepository
{
    IList<Foo> GetOrderedObjects();
}

public interface FooRepository : BaseClass<Foo>, IFooRepository
{
    public IList<Foo> GetOrderedObjects()
    {
        //GetById method is accessible from the repository - Fine
        var obj = this.GetById(5);

        //Dummy Code
        return new List<Foo>();
        //
    }
}

//主应用

public class void Main()
{
    private IFooRepository _fooRepository;

    public void ProgramStartsHere()
    {
         //This is ok.
         var list = _fooRepository.GetOrderedObjects();

         //Problem is here - GetById method is not accessible from the main program through the FooRepository
         var obj = _fooRepository.GetById(10);
    }
}

Answer 1

接口中未定义GetById

我会做一个

public interface IBaseRepository<T> where T : BaseEntitiy {
 T GetById<T>(int id);
}

然后BaseClass实现IBaseRepository<T>

并IFooRepository继承自IBaseRepository<Foo>

编辑:

一个完整的例子,类似于@Olivier JD,带有想法(可能是错误的),GetOrderedObject对于你的所有实体可能是相同的.

public abstract class BaseEntity
{
    public override abstract String ToString();
}

//all generic methods
public interface IRepositoryBase<T>
    where T : BaseEntity, new()
{
    T GetById(int id);
    IList<T> GetOrderedObjects();

}

//all methods specific to foo, which can't be in a generic class
public interface IFooRepository :IRepositoryBase<Foo>
{
    void Update(Foo model);
}

//implementation of generic methods
public abstract class BaseClass<T> : IRepositoryBase<T>
    where T : BaseEntity, new() // ===> Add new() constraint here
{
    public T GetById(int id)
    {
        return new T();
    }
    public IList<T> GetOrderedObjects() {
        var obj = this.GetById(5);

        //Dummy Code
        return new List<Foo>();
        //
    }
}

//implementation of Foo specific methods
public class FooRepository : BaseClass<Foo>, IFooRepository
{
    public void Update(Foo model) {
    //bla bla
    }
}