代码之家 › 专栏 › 技术社区 › Westerlund.io

具有泛型类型的基类,该基类实现具有泛型类型的接口

.net-4.6.2 repository-pattern design-patterns c#

-1

Westerlund.io · 技术社区 · 7 年前

FooRepository IEntity Type parameter 'IEntity' hides interface 'IEntity' Cannot resolve symbol 'ID' GetById

Bar )作为方法,例如因为它们之间的功能基本相同。

public abstract class FooRepository<IEntity> : IRepository<IEntity>
{
    private List<IEntity> _data;

    public List<IEntity> GetAll()
    {
        return this._data;
    }

    public IEntity GetById(int id)
    {

        return this.GetAll().Single(c => c.ID == id);
    }
}

public class BarRepository : FooRepository<Bar>
{
}

public interface IEntity
{
    int ID { get; set; }
}

public interface IRepository<IEntity>
{
    List<IEntity> GetAll();
    IEntity GetById(int id);
}

public class Bar : IEntity
{
    public int ID { get; set; }
    public string Name { get; set; }
}

1 回复 | 直到 7 年前

1

Aldert 7 年前

我使用泛型修复了您的抽象类。

public abstract class FooRepository<T> : IRepository<T> where T: IEntity
    {
        private List<T> _data;

        public List<T> GetAll()
        {
            return this._data;
        }

        T IRepository<T>.GetById(int id)
        {
            return this.GetAll().Single(c => c.ID == id);
        }
    }

    public class BarRepository : FooRepository<Bar>
    {
    }

    public interface IEntity
    {
        int ID { get; set; }
    }

    public interface IRepository<T>
    {
        List<T> GetAll();
        T GetById(int id);
    }

    public class Bar : IEntity
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }

public abstract class FooRepository<T> where T: IEntity
    {
        private List<T> _data;

        public List<T> GetAll()
        {
            return this._data;
        }

        T GetById(int id)
        {
            return this.GetAll().Single(c => c.ID == id);
        }
    }

    public class BarRepository : FooRepository<Bar>
    {
    }

    public interface IEntity
    {
        int ID { get; set; }
    }


    public class Bar : IEntity
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }