Question

我正在开发一个Asp.Net MVC 4应用程序，我有两个模型类：

CompanyModel：

Public Class CompanyModel

    <Key()>
    Public Overridable Property CompanyID As Integer

    <Required(ErrorMessage:="Enter a company name.")>
    <Display(Name:="Company")>
    <StringLength(80, ErrorMessage:="The {0} must have {2} characters.", MinimumLength:=2)>
    Public Overridable Property Name As String

    <Required(AllowEmptyStrings:=False, ErrorMessage:="Enter the DB ID.")>
    <Display(Name:="DB ID")>
    Public Overridable Property DBID As Integer

End Class

PersonModel：

Public Class PersonModel

    <Key()>
    Public Overridable Property PersonID As Integer

    <Required(AllowEmptyStrings:=False, ErrorMessage:="Enter the name.")>
    <Display(Name:="Name")>
    Public Overridable Property Name As String

    <Required(AllowEmptyStrings:=False, ErrorMessage:="Enter the pass")>
    <DataType(DataType.Password)>
    <Display(Name:="Password")>
    Public Overridable Property Password As String

    <Required(AllowEmptyStrings:=False, ErrorMessage:="Enter the mail")>
    <Display(Name:="E-mail")>
    Public Overridable Property Email As String

    <Required(ErrorMessage:="Enter the company")>
    <Display(Name:="Company")>
    Public Overridable Property BcoID As CompanyModel

End Class

PersonController：

'
' POST: /Person/Create

<HttpPost()> _
Function Create(ByVal model As PersonModel) As ActionResult
    Try
        If ModelState.IsValid Then
            personDAO.Save(model)
        End If

        Return RedirectToAction("Index")
    Catch
        Return View()
    End Try
End Function

我在Views / Person / Create：

中有这个代码

<div class="editor-label">
    @Html.LabelFor(Function(model) model.BcoID)
</div>
<div class="editor-field">
    @Html.DropDownListFor(Function(model) model.BcoID.CompanyID, New SelectList(ViewBag.Company, "CompanyID", "Name"))
    @Html.ValidationMessageFor(Function(model) model.BcoID)
</div>

当我创建新Person时，在PersonController中，当我尝试保存时，我得到ModelState.Isvalid = False，消息是“输入公司名称”。我不知道为什么会这样。

任何人都可以帮助我？

修改

如果我将我的属性从model.BcoID.CompanyID更改为model.BcoID.Name并使用EditorFor，而不是使用DropDownListFor。 ModelState.IsValid是True，但是我需要一个DropDownList，所以我放了一个DropDownList，现在我在我的视图中进行了验证按摩（“公司必须有2个字符。”）。

以下是我现在所拥有的：

<div class="editor-label">
    @Html.LabelFor(Function(model) model.BcoID.Name)
</div>
<div class="editor-field">
    @Html.DropDownListFor(Function(model) model.BcoID.Name, New SelectList(ViewBag.Company, "CompanyID", "Name"))
    @Html.ValidationMessageFor(Function(model) model.BcoID.Name)
</div>

Answer 1

确保您的视图中有公司名称属性，因为您的模型中需要此属性：

<div class="editor-label">
    @Html.LabelFor(Function(model) model.BcoID.Name)
</div>
<div class="editor-field">
    @Html.EditorFor(Function(model) model.BcoID.Name)
    @Html.ValidationMessageFor(Function(model) model.BcoID.Name)
</div>

Label和ValidationMessage帮助程序也附加到CompanyID属性的错误属性。它应该是这样的：

<div class="editor-label">
    @Html.LabelFor(Function(model) model.BcoID.CompanyID)
</div>
<div class="editor-field">
    @Html.DropDownListFor(Function(model) model.BcoID.CompanyID, New SelectList(ViewBag.Company, "CompanyID", "Name"))
    @Html.ValidationMessageFor(Function(model) model.BcoID.CompanyID)
</div>

注意Label和ValidationMessage现在如何与DropDownList正确关联。

Asp.Net MVC 4 ModelState.IsValid返回False

1 个答案: