验证后MVC表单数据丢失

Question

好吧，让我开始说我是MVC的全新。因此，我使用Visual Studio 2010附带的MVC版本。这也是使用Visual Basic，但我相信一旦你看到代码就可以搞清楚。

我想验证我的数据，验证过程工作正常。但是，如果验证失败，我的文本框中的值不会重新加载到表单上。

我的表单相当简单，因为我想从我的第一个应用程序简单的东西开始。它由一个绑定到协议对象集合的表组成。在表格的底部，我有两个用于添加新协议的文本框。正是这两个文本框没有将数据发回给他们。

这里是视图：

<%@ Page Title="" Language="VB" MasterPageFile="~/Views/Shared/Food.Master" Inherits="System.Web.Mvc.ViewPage(Of IEnumerable (Of NdaToolLibrary.BusinessLayer.Agreement))" %> 

<asp:Content ID="Content1" ContentPlaceHolderID="PrimaryContent" runat="server"> 

<h1>Agreement List</h1> 

<table cellpadding="0" cellspacing="0" border="0" class="tableDefault" style="width: 300px !important"> 
    <tr> 
     <th> 
      AccountType 
     </th> 
     <th> 
      NationalId 
     </th> 
     <th></th> 
    </tr> 

<% For i As Integer = 0 To Model.Count - 1%> 

    <tr class="<%= IIF(i mod 2 = 0, "", "detailRow") %>"> 
     <td> 
      <%: Model(i).AccountType%> 
     </td> 
     <td> 
      <%: Model(i).NationalId%> 
     </td> 
     <td> 
      <%: Html.RouteLink("Delete", "Delete", New With {.action="Delete", .acctType = Model(i).AccountType, .id = Model(i).NationalId})%> 
     </td> 
    </tr> 

<% Next%> 

    <tr class="footerRow"> 
     <td> 
      <%= Html.TextBox("AccountType")%> 
      <%= Html.ValidationMessage("AccountType", " ")%> 
     </td> 
     <td> 
      <%= Html.TextBox("NationalId")%> 
      <%= Html.ValidationMessage("NationalId"," ")%> 
     </td> 
     <td> 
      <a href="javascript: document.forms[0].action='/Agreement/Create'; document.forms[0].submit();">Create</a> 
     </td> 
    </tr> 
</table> 

<%= Html.ValidationSummary("Could not save agreement. Reasons include:", New with{.class = "red"})%> 
</asp:Content> 

这里是控制器：

Namespace Web 
Public Class AgreementController 
    Inherits System.Web.Mvc.Controller 

    Public Function Create(ByVal FormValues As FormCollection) As ActionResult 
     Dim agreement As New BusinessLayer.Agreement() 

     agreement.AccountType = FormValues("AccountType").ToString() 
     agreement.NationalId = FormValues("NationalId").ToString() 

     If agreement.IsValid Then 
      Try 
       agreement.Save() 
      Catch ex As Exception 
       ModelState.AddModelError("", ex.Message) 
      End Try 
     Else 
      For Each validationError As BusinessLayer.DataValidationMessage In agreement.GetValidationResults() 
       ModelState.AddModelError(validationError.Property, validationError.Message) 
      Next 
     End If 

     'Try 
     ' agreement.AccountType = FormValues("AccountType").ToString() 
     ' agreement.NationalId = FormValues("NationalId").ToString() 

     ' agreement.Save() 
     'Catch dvEx As BusinessLayer.DataValidationException 
     ' For Each validationError As BusinessLayer.DataValidationMessage In dvEx.ValidationMessages 
     '  ModelState.AddModelError(validationError.Property, validationError.Message) 
     ' Next 
     'Catch ex As Exception 
     ' ModelState.AddModelError("", ex.Message) 
     'End Try 

     Dim agreements As New BusinessLayer.AgreementCollection() 
     agreements.Load() 

     Return View("Index", agreements) 
    End Function 

    Public Function Delete(ByVal AcctType As String, ByVal Id As String) As ActionResult 
     Dim agreement As New BusinessLayer.Agreement() 
     agreement.AccountType = AcctType 
     agreement.NationalId = Id 

     Return View("Delete", agreement) 
    End Function 

    <AcceptVerbs(HttpVerbs.Post)> _ 
    Public Function Delete(ByVal AcctType As String, ByVal Id As String, ByVal FormValues As FormCollection) As ActionResult 
     Dim agreement As New BusinessLayer.Agreement(AcctType, Id) 
     agreement.Delete() 

     Return RedirectToAction("Index") 
    End Function 

    Public Function Index() As ActionResult 
     Dim agreements As New BusinessLayer.AgreementCollection() 
     agreements.Load() 

     ' Return View("Index", agreements) is implied because the view has the same name as the action 
     Return View(agreements) 
    End Function 



End Class 
End Namespace 

Answer 1

首先我想你应该提取你的字段需要在一个单独的视图中创建一个新帐户（右现在它在主页面中）。您可以通过在主页面视图上添加链接来访问这个新视图。 你的新视图应该是强类型的（你需要为它创建一个模型）。 然后在新视图页中使用（Html.BeginForm（））{}语句创建您的帐户所需的字段。
和控制器上，你必须有类似

public void Create(YourModelType model) 
{ 
    if (!ModelState.IsValid) //this will check if there are validation errors after binding 
    { 
     return View(model); //this will repopulate back the input collected from the form 
    } 
    //here you can put your code to process the creation 
} 

对不起，让您在C＃中的例子，但我不知道VB。

希望我的回答能帮助你。