验证在MVC 4使用服务层实现服务器侧和客户端验证

Question

您好我有一些字段

表雇员来验证字段我已经创建了两个层

1. 服务层

2. 员工存储库

员工存储库代码是

namespace MvcApplication2.Models 
{ 

    public interface IEmployeeMainTableRepository 
    { 
     bool CreateEmployee(EMP_MAIN_TBL EmployeeToCreate); 
     IEnumerable<EMP_MAIN_TBL> ListEmployees(); 
    } 


    public class EmployeeRepository : MvcApplication2.Models.IEmployeeMainTableRepository 
    { 
     private EMPLOYEE_SYSTEMEntities _entities = new EMPLOYEE_SYSTEMEntities(); 


     public IEnumerable<EMP_MAIN_TBL> ListEmployees() 
     { 
      return _entities.EMP_MAIN_TBL.ToList(); 
     } 


     public bool CreateEmployee(EMP_MAIN_TBL EmployeeToCreate) 
     { 
      try 
      { 
       // _entities.AddToEMP_MAIN_TBL(productToCreate); 
       _entities.SaveChanges(); 
       return true; 
      } 
      catch 
      { 
       return false; 
      } 
     } 


    } 

和服务层含有

public interface IEmployeeService 

    { 
     bool CreateEmployee(EMP_MAIN_TBL EmployeeToCreate); 
     System.Collections.Generic.IEnumerable<EMP_MAIN_TBL> ListEmployees(); 
    } 

    public class EmployeeService : MvcApplication2.Models.IEmployeeService 
    { 


     private IValidationDictionary _validatonDictionary; 
     private IEmployeeMainTableRepository _repository; 

     public EmployeeService(IValidationDictionary validationDictionary, IEmployeeMainTableRepository repository) 
     { 
      _validatonDictionary = validationDictionary; 
      _repository = repository; 
     } 



     protected bool ValidateEmployee(EMP_MAIN_TBL employeeToValidate) 
     { 
      if (employeeToValidate.EMP_NM == null) 
       _validatonDictionary.AddError("EMP_NM", "Name is required."); 
      if (employeeToValidate.PLCE_OF_BRTH == null) 
       _validatonDictionary.AddError("PLCE_OF_BRTH", "Place of birth is required."); 

      return _validatonDictionary.IsValid; 
     } 

     public IEnumerable<EMP_MAIN_TBL> ListEmployees() 
     { 
      return _repository.ListEmployees(); 
     } 

     public bool CreateEmployee(EMP_MAIN_TBL EmployeeToCreate) 
     { 
      // Validation logic 
      if (!ValidateEmployee(EmployeeToCreate)) 
       return false; 

      // Database logic 
      try 
      { 
       _repository.CreateEmployee(EmployeeToCreate); 
      } 
      catch 
      { 
       return false; 
      } 
      return true; 
     } 

和我已经创建了两个以上的类来添加验证消息

public interface IValidationDictionary 
{ 
    void AddError(string key, string errorMessage); 
    bool IsValid { get; } 
} 

而且

public class ModelStateWrapper : IValidationDictionary 
    { 

     private ModelStateDictionary _modelState; 

     public ModelStateWrapper(ModelStateDictionary modelState) 
     { 
      _modelState = modelState; 
     } 

     #region IValidationDictionary Members 

     public void AddError(string key, string errorMessage) 
     { 
      _modelState.AddModelError(key, errorMessage); 
     } 

     public bool IsValid 
     { 
      get { return _modelState.IsValid; } 
     } 

     #endregion 
    } 

最后雇员控制器包括下面结构URE

public class EmployeeController : Controller 
    { 
     private IEmployeeService _service; 

     public EmployeeController() 
     { 
      _service = new EmployeeService(new ModelStateWrapper(this.ModelState), new EmployeeRepository()); 
     } 

     public EmployeeController(IEmployeeService service) 
     { 
      _service = service; 
     } 


     public ActionResult Index() 
     { 
      return View(_service.ListEmployees()); 
     } 


     // 
     // GET: /Product/Create 

     public ActionResult Create() 
     { 
      return View(new EMP_MAIN_TBL()); 
     } 

     // 
     // POST: /Product/Create 

     [AcceptVerbs(HttpVerbs.Post)] 
     [HttpPost] 
     public ActionResult Create([Bind(Exclude = "EMP_ID")] EMP_MAIN_TBL employeeToCreate) 
     { 
      if (!_service.CreateEmployee(employeeToCreate)) 
       return View(); 
      return RedirectToAction("Index"); 
     } 


    } 
} 

，我的看法是这样的

我的问题是上面的代码工作正常进行服务器端验证

但我怎么在客户端使用上述相同的实现验证代码 请

Answer 1

由于您已经在服务端进行了验证，因此您可以将retu在ModelStateDictionary而不是bool中，您可以检查它在客户端是否有效。 但是这对检查整个服务方法已经完成没有帮助，因此您可以创建一个返回说bool和ModelStateDictionary的新类型。

另一种方法是使用故障例外。您可以创建自己的故障异常，当模型状态无效时将引发异常。此模型状态错误可能包含您的ModelStateDictionary。

所以你有三个选择。

1. 将返回类型更改为ModelStateDictionary。
2. 创建一个新的返回类型以返回一个结果和一个ModelStateDictionary。
3. 使用模型状态无效时发生的故障异常。

就我个人而言，我会使用第三种方法，因为您仍然可以使用您的原始返回类型，然后只需要像发生异常一样捕获故障。这是一个example也MSDN