如何获得和值设置为，并从ASP HiddenField [英] How to get and set a value to and from an asp HiddenField

问题描述

我想一个布尔值添加到 HiddenField ASP.NET控制器，以便该值可以回发后予以保留。这里是我的code：

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标记

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

[...]

修改

的问题是，在控制的ID没有被找到：
错误311名IsAddingNewCauseField'未声明。

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

推荐答案

我估计你需要搜索的列表视图控件的。控制没有得到设计师的条目只有当动态创建的存在。因为我我的手机上，并不能检查我可能是错的。

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.

编辑包括code，它的将是沿着这些路线。

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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