继承/泛型基础知识.如何实现 DRY 的代码结构

为了今天干掉我的代码，我想做以下事情。(我不知道这是否是最好的方法，但这似乎比拥有不断增加的代码库要好，如果我想在整个站点中更改某些内容，我需要不断更新多种方法(

我对继承的了解是可怕的。由于 Iv'e 从未质疑过我使用的任何代码/库，而 Iv'e 以前从未真正尝试过编写这样的东西，但我想学习......希望这将是我的启蒙日:P

对于我的问题：

假设 Iv'e 有一个添加方法(在我的所有控制器中(，如下所示：

public ActionResult Add(VM_Down_Time_Capture viewModel)
        {
            using (Down_Time_CaptureRepository repository = new Down_Time_CaptureRepository())
            {
                if (!ModelState.IsValid)
                    return ReturnValidationFailure(ViewData.ModelState.Values);
                Down_Time_Capture model = new Down_Time_Capture();
                model.InjectFrom(viewModel);
                string mserMsg = repository.Add(model, User.Identity.Name);
                if (!string.IsNullOrEmpty(mserMsg))
                    return ReturnCustomValidationFailure(Server.HtmlEncode(mserMsg));
                repository.Save();
                return Json("Added successfully.", JsonRequestBehavior.AllowGet);
            }
        }

目前我也有以下内容。

由 T4 模板/EF 生成。

    ViewModels, Repositories, (Standard) EF Models

我想我需要一个每个页面的ModelSpecfic基本控制器(可以使用T4完成(，该控制器继承自包含基本CRUD功能的自定义ControllerBase类。这样我就可以为每个控制器提供自定义代码，并且我的代码库将更干净，更小，如果我需要重新生成基本文件，它不会受到影响

我不太明白如何按照我需要的思路实现某些东西。到目前为止，我的理解是，我不需要拥有我的存储库，并且视图模型也从基础继承，并以某种方式在 [B] 中指定我正在使用哪些模型......但至于怎么做我不知道

例如(这是我最好的尝试，而不是我的实际代码，非常笨拙，因为我非常困惑：S(

    public class Down_Time_CaptureController : Down_Time_CaptureBase
    {
     //[A]
    }
    //Generated by T4
    public class Down_Time_CaptureBase: ControllerBase
    {
      //[B]
       public override EntityObject CreateNewModel()
       {
          return new Down_Time_Capture();
       }
       public override Base_Repository CreateNewRepository()
       {
          return new Down_Time_CaptureRepository();
       }
       public override Base_ViewModel CreateNewViewModel()
       {
          return new VM_Down_Time_Capture();
       }
      //how would i go about specifying which repository & model & view model to use
      //although i expect it to be something to what i did here above
      //and how would i go about calling the new generic add method (but in context of this controller)?
    }
    //coded once
    public abstract class ControllerBase: Controller
    {
        //[C]
        //make abstract so i have to override it
        public abstract Base_Controller CreateNewModel();
        public abstract Base_Controller CreateNewRepository();
        public abstract Base_Controller CreateNewViewModel();
        //I'm assuming my generified add method would go in here  
        public virtual ActionResult Add(Base_ViewModel viewModel)
        {
           using (Base_Repository repository = CreateRepository())
           {
                   if (!ModelState.IsValid)
                       return ReturnValidationFailure(ViewData.ModelState.Values);
                   EntityObject model = CreateNewModel();
                   model.InjectFrom(viewModel);
                   string mserMsg = repository.Add(model, User.Identity.Name);
                   if (!string.IsNullOrEmpty(mserMsg))
                       return ReturnCustomValidationFailure(Server.HtmlEncode(mserMsg));
                   repository.Save();
                   return Json("Added successfully.", JsonRequestBehavior.AllowGet);
            }       
        }
    }

// concrete controller implementation
public class Down_Time_CaptureController: ControllerBase<Down_Time_Capture, VM_Down_Time_Capture, Down_Time_CaptureRepository>
{
}
// generic controller base
public abstract class ControllerBase<TModel, TViewModel, TRepository>: Controller
        where TModel : Base_Model, new()
        where TViewModel : Base_ViewModel, new()
        where TRepository : Base_Repository, new()
{
    protected virtual TModel CreateNewModel()
    {
           return (TModel)Activator.CreateInstance<TModel>();
    }
    protected virtual TRepository CreateNewRepository()
    {
           return (TRepository)Activator.CreateInstance<TRepository>();
    }
    protected virtual TViewModel CreateNewViewModel()
    {
            return (TViewModel)Activator.CreateInstance<TViewModel>();
    }
    //I'm assuming my generified add method would go in here  
    public virtual ActionResult Add(TViewModel viewModel)
    {
       using (var repository = CreateRepository())
       {
               if (!ModelState.IsValid)
                   return ReturnValidationFailure(ViewData.ModelState.Values);
               var model = CreateNewModel();
               model.InjectFrom(viewModel);
               string mserMsg = repository.Add(model, User.Identity.Name);
               if (!string.IsNullOrEmpty(mserMsg))
                   return ReturnCustomValidationFailure(Server.HtmlEncode(mserMsg));
               repository.Save();
               return Json("Added successfully.", JsonRequestBehavior.AllowGet);
        }       
    }
}