使用状态模式验证ASP.NET中的多页表单

Question

我试图为多页注册表单实现状态模式。每个页面上的数据将被累积并存储在会话对象中。

验证（包括对数据库的服务层调用）是否发生在页级别或每个状态类内部？换句话说，IState的具体实现应该与验证有关还是应该给予充分有效的对象？请参阅下面的“EmptyFormState”类：

namespace Example 
{ 
    public class Registrar 
    { 
     private readonly IState formEmptyState; 
     private readonly IState baseInformationComplete; 

     public RegistrarSessionData RegistrarSessionData { get; set;} 

     public Registrar() 
     { 
      RegistrarSessionData = new RegistrarSessionData(); 
      formEmptyState = new EmptyFormState(this); 
      baseInformationComplete = new BasicInfoCompleteState(this); 
      State = formEmptyState; 
     } 

     public IState State { get; set; } 

     public void SubmitData(RegistrarSessionData data) 
     { 
      State.SubmitData(data);    
     } 

     public void ProceedToNextStep() 
     { 
      State.ProceedToNextStep(); 
     } 
    } 





    //actual data stored in the session 
    //to be populated by page 
    public class RegistrarSessionData 
    {   

     public string FirstName { get; set; } 
     public string LastName { get; set; } 
     //will include values of all 4 forms 
    } 





    //State Interface 
    public interface IState 
    { 
     void SubmitData(RegistrarSessionData data); 
     void ProceedToNextStep(); 

    } 

    //Concrete implementation of IState 
    //Beginning state - no data 
    public class EmptyFormState : IState 
    { 
     private readonly Registrar registrar; 

     public EmptyFormState(Registrar registrar) 
     { 
      this.registrar = registrar; 
     } 

     public void SubmitData(RegistrarSessionData data) 
     {  
      //Should Validation occur here? 
      //Should each state object contain a validation class? (IValidator ?) 
      //Should this throw an exception? 
     } 

     public void ProceedToNextStep() 
     { 
      registrar.State = new BasicInfoCompleteState(registrar); 
     } 
    } 

    //Next step, will have 4 in total 
    public class BasicInfoCompleteState : IState 
    { 
     private readonly Registrar registrar; 

     public BasicInfoCompleteState(Registrar registrar) 
     { 
      this.registrar = registrar; 
     } 

     public void SubmitData(RegistrarSessionData data) 
     {    
      //etc 
     } 

     public void ProceedToNextStep() 
     {   
      //etc 
     } 
    } 
} 

Answer 1

我更喜欢在状态（集合）级别和最终落实两者上进行验证。一般而言，我更愿意尽快验证，作为良好用户体验的一部分。从数据验证/保护级别来看，我更愿意在最终的保存/提交级别进行验证，以防万一隐藏通过，防止一般欺骗，或者（更可能）在将来保存/提交点的不同路由。