ASP.NET中多页表单的状态模式验证

Question

我正在尝试实现一个多页注册表单的状态模式。每页上的数据将被累积并存储在一个会话对象中。

验证(包括对DB的服务层调用)应该在页面级别还是在每个状态类内部进行？换句话说，IState的具体实现应该关注验证，还是应该给它一个完全填充的有效对象？参见下面的"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)级别和最终提交时进行验证。一般来说，作为良好的用户体验的一部分，我更喜欢尽快进行验证。从数据验证/保护级别来看，我更喜欢在最终的保存/提交级别进行验证，以防某些东西偷偷通过，防止一般的欺骗，或者(更有可能的)将来到保存/提交点的不同路径。