我的商業邏輯應該去哪裏？

Question

我在我的應用程序中有以下的邏輯分離，你可以看到我有一個名爲SimpleController的類，它用於導入和查找SimpleEntities。

我將所有SimpleEntities讀入內存列表因爲我經常搜索這些實體，並且每當我想要搜索一個實體時從數據庫中讀取的速度會更快。

將SimpleEntities讀入並存儲到SimpleLogic類而不是SimpleController類中的邏輯會更好嗎？

public class SimpleEntity 
{ 
    public int SimpleId { get; set; } 
    public string SimpleName { get; set; } 
} 

public class SimpleDAL 
{ 
    public ICollection<SimpleEntity> GetAllSimpleEntities() 
    { 
     //Retrieve SimpleEntities from Database 
    } 
    public void InsertSimpleEntity(SimpleEntity simpleEntity) 
    { 
     //Insert simple Entity into Database 
    } 
} 

public class SimpleLogic 
{ 
    private readonly SimpleDAL simpleDAL = new SimpleDAL(); 

    public ICollection<SimpleEntity> GetAllSimpleEntities() 
    { 
     return simpleDAL.GetAllSimpleEntities(); 
    } 
    public void InsertSimpleEntity(SimpleEntity simpleEntity) 
    { 
     //Validate simpleEntity before adding to database 
     if (simpleEntity.SimpleId <= 0) 
      throw new Exception("Invalid SimpleEntity Id: " + simpleEntity.SimpleId); 

     if (String.IsNullOrEmpty(simpleEntity.SimpleName)) 
      throw new Exception("SimpleEntity Name cannot be empty or null"); 

     simpleDAL.InsertSimpleEntity(simpleEntity); 
    } 
} 

public class SimpleController 
{ 
    private readonly SimpleLogic simpleLogic = new SimpleLogic(); 
    private List<SimpleEntity> simpleEntities; 

    public SimpleController() 
    { 
     simpleEntities = simpleLogic.GetAllSimpleEntities().ToList(); 
    } 

    public int FindSimpleIndex(int simpleId) 
    { 
     return simpleEntities.FindIndex(p=> p.SimpleId == simpleId); 
    } 

    public void ImportOtherSimpleEntity(OtherSimpleEntity otherSimpleEntity) 
    { 
     if (otherSimpleEntity.Operation == "Update") 
     { 
      int index = FindSimpleIndex(otherSimpleEntity.OtherSimpleId); 
      //If entity was found update SimpleEntity 
      if (index > -1) 
      { 
       //Call SimpleLogic.UpdateSimpleEntity(Pass in SimpleEntity); 
      } 
     } 
    } 
} 

Answer 1

我想也許是實現一個SimpleEntityManager可以從控制器內引用，如有必要，可以在外面操作它。所以控制器處理系統的MVC方面，並且SimpleEntityManager管理SimpleEntities。

順便說一下，InsertSimpleEntity()似乎在SimpleEntity字段上執行驗證。我通常寧願SimpleEntity執行驗證本身（最有可能在施工期間）。