我试图为我所有的存储库实现定义一个特定的接口,就像这样:
public abstract class GeneralizedRepository
{
readonly IDataModel _Model;
public GeneralizedRepository(IDataModel Model) {
if (Model == null)
throw new NullReferenceException();
_Model = Model;
}
public IDataModel DataModel { get { return _Model; } }
public abstract IEnumerable<T> GetAll<T>();
public abstract T GetOne<T>(Func<T, bool> predicate);
public abstract bool Contains<T>(Func<T, bool> predicate);
public abstract void Add<T>(T entity);
public abstract void Update<T>(T entity);
public abstract bool Remove<T>(Func<T, bool> predicate);
}
这是一个类,因为我的派生存储库有一个共同的实例DataModel
现在我有具体的实现如下:
public class DetailRep : GeneralizedRepository
{
public DetailRep(IDataModel Model) : base(Model) { }
public DetailRep(UnitOfWork Unit) : base(Unit.Model) { }
public override IEnumerable<T> GetAll<T>() {
throw new NotImplementedException();
}
public override T GetOne<T>(Func<T, bool> predicate) {
throw new NotImplementedException();
}
public override bool Contains<T>(Func<T, bool> predicate) {
throw new NotImplementedException();
}
public override void Add<T>(T entity) {
throw new NotImplementedException();
}
public override void Update<T>(T entity) {
throw new NotImplementedException();
}
public override bool Remove<T>(Func<T, bool> predicate) {
throw new NotImplementedException();
}
}
但是它是一个Detail Repository,我的意思是我想要替换所有的T为类型Detail
但是在编译时抛出错误:
类型参数声明必须是标识符而不是类型
将抽象类声明为泛型:
public abstract class GeneralizedRepository<T>
{
readonly IDataModel _model;
public GeneralizedRepository(IDataModel model)
{
if (model == null)
throw new NullReferenceException();
_model = model;
}
public IDataModel DataModel { get { return _model; } }
public abstract IEnumerable<T> GetAll();
public abstract T GetOne(Func<T, bool> predicate);
public abstract bool Contains(Func<T, bool> predicate);
public abstract void Add(T entity);
public abstract void Update(T entity);
public abstract bool Remove(Func<T, bool> predicate);
}
然后在你的派生类上用你的Detail
填充类型:
public class DetailRep : GeneralizedRepository<Detail>
{
public DetailRep(IDataModel model)
: base(model)
{
}
public override IEnumerable<Detail> GetAll(){}
public override Detail GetOne(Func<Detail, bool> predicate){}
public override bool Contains(Func<Detail, bool> predicate){}
public override void Add(Detail entity){}
public override void Update(Detail entity){}
public override bool Remove(Func<Detail, bool> predicate){}
}