验证使用mvc 4中的服务层来实现服务器端和客户端验证

Question

您好我有一些表格员工

验证我创建了两个图层的字段

1. 服务层

2. 员工资料库

员工存储库代码

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;
            }
        }


    }

服务层包含

    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;
        }

我创建了另外两个类来添加验证消息

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

和

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
    }

最后员工控制器包含以下结构

  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");
        }


    }
}

我的观点看起来像这样



我的问题是上面的代码适用于服务器端验证

但是如何使用相同的代码在客户端实现验证 请

Answer 1

由于您已经在服务端验证，您可以返回ModelStateDictionary而不是bool，然后您可以检查它在客户端是否有效。 但是，当检查整个服务方法已经完成时，这无济于事，因此您可以创建一个返回bool和ModelStateDictionary的新类型。

另一种方法是使用Fault Exceptions。您可以创建自己的错误异常，当模型状态无效时会抛出异常。此模型状态错误可能包含您的ModelStateDictionary。

因此，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结果和ModelStateDictionary。
3. 使用模型状态无效时发生的故障异常。

我个人会使用第三种方法，因为你仍然可以使用原始的返回类型，然后只需要像异常一样捕获错误。这是example和MSDN