如何从 asp HiddenField 获取和设置值

发布于 2024-11-16 00:18:04 字数 846 浏览 4 评论 0原文

我想向 HiddenField ASP.NET 控制器添加一个布尔值，以便在回发后可以保留该值。这是我的代码：

Public Property IsAddingNewCause() As Boolean
    Get 
        Return IsAddingNewCauseField.value
    End Get
    Set(ByVal value As Boolean)
        IsAddingNewCauseField.value = value          
       '^^^^^^^^^^^^^^^^^^^^^this is where I want to set the HiddenField's value!
    End Set
End Property

ASP.NET Markup

<asp:ListView ID="lstNewCause" runat="server" DataSource="..." >
    <EditItemTemplate>
                <tr>
                    <td>
                        <asp:HiddenField ID="IsAddingNewCauseField" runat="server" Value="" />

[...]

编辑

问题是找不到控件的 ID： 错误 311 名称“IsAddingNewCauseField”未声明。

原文

I want to add a Boolean value to a HiddenField ASP.NET controller so that the value can be retained after postback. Here is my code:

Public Property IsAddingNewCause() As Boolean
    Get 
        Return IsAddingNewCauseField.value
    End Get
    Set(ByVal value As Boolean)
        IsAddingNewCauseField.value = value          
       '^^^^^^^^^^^^^^^^^^^^^this is where I want to set the HiddenField's value!
    End Set
End Property

ASP.NET Markup

<asp:ListView ID="lstNewCause" runat="server" DataSource="..." >
    <EditItemTemplate>
                <tr>
                    <td>
                        <asp:HiddenField ID="IsAddingNewCauseField" runat="server" Value="" />

[...]

EDIT

The problem is that the control's ID is not being found:
Error 311 Name 'IsAddingNewCauseField' is not declared.

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夏天碎花小短裙 2024-11-23 00:18:04

我认为您需要在列表视图控件中搜索它。该控件没有设计器条目，仅在动态创建时才存在。我可能是错的，因为我在手机上无法检查。

编辑包含的代码，它将遵循这些原则。

Protected Sub lstNewCause_ItemUpdated(sender As Object, e As ListViewUpdatedEventArgs)

    Dim l As ListView = DirectCast(sender, ListView)

    Dim item As ListViewItem = lstNewCause.Items(l.SelectedIndex)

    Dim IsAddingNewCauseField As HiddenField = DirectCast(item.FindControl("IsAddingNewCauseField"), HiddenField)

    '...do your stuff


End Sub

I reckons you need to search the listviews controls for it. The control doesn't get a designer entry and only exists when created dynamically. I might be wrong as I'm on my phone and can't check.

Edit included code, its going to be along these lines.

Protected Sub lstNewCause_ItemUpdated(sender As Object, e As ListViewUpdatedEventArgs)

    Dim l As ListView = DirectCast(sender, ListView)

    Dim item As ListViewItem = lstNewCause.Items(l.SelectedIndex)

    Dim IsAddingNewCauseField As HiddenField = DirectCast(item.FindControl("IsAddingNewCauseField"), HiddenField)

    '...do your stuff


End Sub

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