Question

我在MVC3中阅读了这个有用的例子http://msdn.microsoft.com/en-us/library/gg508808%28v=vs.98%29.aspx?cs-save-lang=1&cs-lang=vb#code-snippet-2进行远程验证，当我创建一个新项目时，它很有用;但是，当我尝试编辑新创建的项目时，我遇到了麻烦。

我有这样的模型

Imports System.ComponentModel
Imports System.ComponentModel.DataAnnotations
Imports System.Web.Mvc
Imports System.Collections.Generic

Public Class Language

    Public Property LanguageId As Integer

    <Display(Name:="DisplayNameLanguageName", ResourceType:=GetType(Resources.Language)),
        Required(ErrorMessageResourceName:="ErrorMessageLanguageNameRequired", ErrorMessageResourceType:=GetType(Resources.Language)),
        StringLength(20),
        Remote("IsNameAvailable", "Language", "AdminArea", ErrorMessageResourceName:="ErrorMessageNameNotAvailable", ErrorMessageResourceType:=GetType(Resources.Language))>
    Public Property Name As String

    Public Property Flag as String    
End Class

在Controller“语言”课程中，我有......

   'OutputCache needed for remote validation
   <OutputCache(Location:=OutputCacheLocation.None, NoStore:=True)>
    Public Class LanguageController
        Inherits System.Web.Mvc.Controller

        Private db As StoreEntities = New StoreEntities

        'remote validation for duplicates
        Public Function IsNameAvailable(Name As String) As JsonResult
            Return Json(Not db.Languages.Any(Function(x) x.Name = Name), JsonRequestBehavior.AllowGet)
        End Function

[...]

从“Create.vbhtml”视图中，我可以创建一种新语言，但是从“Edit.vbhtml”我不能仅编辑Flag属性，因为验证开始时为Name保留相同的值。我也被迫改变了Name属性。

我该如何解决这个问题？

Answer 1

我解决了在Edit.vbhtml视图中添加隐藏字段“HiddenName”并将语言名称作为值的问题，并在Controller中编辑验证函数

Public Function IsNameAvailable(Name As String, Optional HiddenName As String = "") As JsonResult
    If Name <> HiddenName Then
        Return Json(Not db.Languages.Any(Function(x) x.Name = Name), JsonRequestBehavior.AllowGet)
    Else
        Return Json(True, JsonRequestBehavior.AllowGet)
    End If
End Function

在MVC3中如何对Edit动作执行远程验证？

1 个答案: