创建松散耦合/可扩展的软件架构

我已经研究了好几个星期了.我目前正在使用n层(3层)方法和工厂设计方法设计松散耦合的架构设计.我的目标是将每个客户端的业务逻辑(ClientA.DLL,ClientB.DLL)放在单独的命名空间中,以便项目扩展,这意味着我可以修改/删除/添加特定客户端的业务逻辑而不会影响其他客户端,因为它们是不依赖于彼此.然后,我使用客户端的唯一标识符(在数据库中维护的字符串值)通过Factory命名空间调用客户端的名称空间/类.所述Factory.DLL还隐藏的每个客户端的逻辑,而BusinessAbstract.DLL 用作每个客户端类将使用的布局或模板.

这是项目解决方案:

这是实际的代码:

BusinessAbstract.DLL

namespace BusinessAbstract
{
   // the entity / data transfer object
   public class MemberDTO
   {
      public string MemberID { get; set; }
      public string MemberName { get; set; }
    }

   // the interface
   public interface IMaintainable
   {
      void Add();
      void Edit();
      void Delete();
   }

  // the base abstract class, implements the Entity and the Interface
  public abstract class Member : MemberDTO, IMaintainable
  {
    // Implement IMaintanable but change it to abstract
    public abstract void Add();
    public abstract void Edit();
    public abstract void Delete();

    // a method with Database access, get from DAL
    public virtual MemberDTO GetMemberDetails(params object[] args)
    {
        return DAL.MemberDAL.FetchMemberDetails(args);
    }

    public virtual string GetClientBLL()
    {
        return "base's method";
    }
   }
 }

ClientA实现了AbstractBusinessRule

ClientA.DLL

 namespace ClientA
 {
    public class _Member : BusinessAbstract.Member
   {
       public override void Add()
      {
        throw new NotImplementedException();
      }

      public override void Edit()
      {
        throw new NotImplementedException();
      }

      public override void Delete()
      {
        throw new NotImplementedException();
      }

      public override string GetClientBLL()
      {
        return "ClientA Method";
      }
    }
 }

工厂

Factory.DLL

 public static class Invoker
 { 
     public static T GetMemberInstance(string clientCode)
        where T : Member, IMaintainable
      {
        Type objType = Type.GetType(clientCode + "._Member," + clientCode);
        return (T)Activator.CreateInstance(objType);
      } 
  }

Presentation Tier上的示例实现

网站

 protected void Page_Load(object sender, EventArgs e)
 {

    // invoke Member class using String hardcode
    Member obj = Invoker.GetMemberInstance("ClientA");
    Response.Write(obj.GetClientBLL()); //prints clientA method

    obj = Invoker.GetMemberInstance("ClientB");
    Response.Write(obj.GetClientBLL()); //prints clientB method

 }

而且你还会注意到我在每个客户端DLL和AbstractBusinessRule DLL中都有一个DAL文件夹,因为我还想缩放DAL层并使用层结构"UI-BLL-DAL".

欢迎任何有关此设计的意见/建议.我希望能得到关于如何改进这种结构的意见.提前致谢.