從網上下載一個網站,說是三層結構,可是不知道這樣設計有什么好處.望哪位大俠不吝賜教.??? public class BaseEntity public interface IBaseDAL<T> where T : BaseEntity?? ??? public abstract class BaseDAL<T> : IBaseDAL<T> where T : BaseEntity, new() public class BaseBLL<T> where T : BaseEntity, new() ?public class User:BaseEntity ?idal:public interface User : IBaseDAL<MSFrame.Main.Entity.User> ?dal:public class User : BaseDAL<MSFrame.Main.Entity.User>, Jide.MSFrame.Main.IDAL.User bll:public class User:BaseBLL<MSFrame.Main.Entity.User> ?public class BLLFactory<T> where T : class ? 使用時大概就是這樣的: Entity.User model = new MSFrame.Main.Entity.User(); BLLFactory<MSFrame.Main.BLL.User>.Instance.Insert2(model); 我想知道為什么要定義以上這些類,這些類有什么作用,這樣有什么好處. 沒專家分了,望大俠們不吝賜教.