ASP.NET MVC模型状态验证

Question

<%= Html.ValidationSummary("Account creation was unsuccessful. Please correct the errors and try again.") %> 
    </div> 
    <% using (Html.BeginForm("Register", "Account" , FormMethod.Post)) 
         { %>  
     <div> 
      <fieldset> 
       <legend>Account Information</legend> 
       <p> 
        <label for="username">User Name:</label> 
        <%= Html.TextBox("username") %> 
        <%= Html.ValidationMessage("username") %> 
       </p> 
       <p> 
        <label for="FirstName">First Name</label> 
        <%= Html.TextBox("firstName") %> 
        <%= Html.ValidationMessage("firstName") %> 
       </p> 
       <p> 
        <label for="LastName">Last Name</label> 
        <%= Html.TextBox("lastName") %> 
        <%= Html.ValidationMessage("lastName") %> 

       </p> 
       <p> 
        <label for="email">Email:</label> 
        <%= Html.TextBox("email") %> 
        <%= Html.ValidationMessage("email") %> 
       </p> 
       <p> 
        <label for="password">Password:</label> 
        <%= Html.Password("password") %> 
        <%= Html.ValidationMessage("password") %> 
       </p> 
       <p> 
        <label for="confirmPassword">Confirm password:</label> 
        <%= Html.Password("confirmPassword") %> 
        <%= Html.ValidationMessage("confirmPassword") %> 
       </p> 
       <p> 
        <label for="Role">Role:</label> 
        <%= Html.DropDownList("Role",((SelectList)ViewData["Roles"]),"--Select One---") %> 
       </p> 
       <p> 
        <input type="submit" value="Register" /> 
       </p> 
      </fieldset> 
     </div> 
    <% } %> 


    private ModelStateDictionary _modelState; 

    public AccountController() : this(null, null) 
     { 
      _modelState = new ModelStateDictionary(); 

     } 

[AcceptVerbs(HttpVerbs.Post)] 
     public ActionResult Register(string username, string firstName, string lastName, string password, string confirmPassword, string email, string role) 
     { 
      try 
      { 

       if (string.IsNullOrEmpty(password)) 
        _modelState.AddModelError("password", "passowrd field is empty"); 
       if (string.IsNullOrEmpty(confirmPassword)) 
        _modelState.AddModelError("confirmPassword", "Confim Passowrd field is empty"); 
       if (string.IsNullOrEmpty(username)) 
        _modelState.AddModelError("username", "UserName field is empty"); 
       if (string.IsNullOrEmpty(email)) 
        _modelState.AddModelError("email", "Email field cannot be empty"); 
       Regex regEmail = new Regex(@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"); 
       if (!regEmail.IsMatch(email)) 
        _modelState.AddModelError("email", " The email id submitted is not in valid format"); 

       if (string.IsNullOrEmpty(firstName)) 
        _modelState.AddModelError("firstName", "First name field is empty"); 
       if (string.IsNullOrEmpty(lastName)) 
        _modelState.AddModelError("lastName", "Last name field is empty"); 

       if (!password.Equals(confirmPassword, StringComparison.InvariantCultureIgnoreCase)) 
        _modelState.AddModelError("password", "Password do not match"); 

       if (_modelState.IsValid) 
       { 
        int id = _UsrService.GetRoleId(role); 
        Data.User usr = new User(username, firstName, lastName, email, DateTime.Now, null, id); 
        string retRegister = _UsrService.RegisterUser(usr, password, confirmPassword, "none", "none"); 

        if (retRegister.Equals("true")) 
        { 
         UserRolesControl contrl = new UserRolesControl(Users(), Roles()); 
         return View("Control", contrl); 
        } 
        else 
        { 
         ModelState.AddModelError("_Form", retRegister); 
         ViewData["PasswordLength"] = MembershipService.MinPasswordLength; 
         var roles = _UsrService.GetRoles().ToList(); 
         ViewData["Roles"] = new SelectList(roles); 
         return View(); 
        } 
       } 
       else 
       { 
        var roles = _UsrService.GetRoles().ToList(); 
        ViewData["Roles"] = new SelectList(roles); 
        return View(); 
       }     
      } 
      catch (Exception ex) 
      { 
       return View(); 
      } 
     } 

上面是一个注册表单，我正在对它进行验证。它在控制器方法中运行良好，但它在发送回注册页面时不显示错误消息。我的代码有什么问题吗？

Answer 1

什么是_modelState？为什么不使用ModelState呢？

或只是Data Annotations客户端验证以及。

在这段代码中，你没有返回ModelState，这就是为什么没有显示错误的原因。只需使用ModelState代替_modelState，你应该准备就绪：

  if (_modelState.IsValid) 
      { 
       //blah 
      } 
      else 
      { 
       var roles = _UsrService.GetRoles().ToList(); 
       ViewData["Roles"] = new SelectList(roles); 
       return View(); 
      }