asp.net - 从代码隐藏访问 ListView 项模板

Question

我希望动态更改 ListView 的 ItemTemplate 中的列数:

<asp:ListView runat="server" ID="ReportListView" DataSourceID="ReportListViewSDS">
 <LayoutTemplate>
   <table>
       <tr>
           <asp:PlaceHolder runat="server" ID="itemPlaceHolder" />
       </tr>
   </table>
 </LayoutTemplate>
 <ItemTemplate>
       <!-- need to dynamically create the number of columns in the code behind 
            based on the select statement in the SelectCommand -->
 </ItemTemplate>
</asp:ListView>

然后在后面的代码中我得到:

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    ' Based on The Request.Form variables sent, the SQL command will 
    ' select x number of columns:
    ' SqlStatement = "SELECT " for each Request.Form values " FROM staff"
    '      example: "SELECT Fname, Lname, email, phone FROM staff"
    ' Run sql command.

    ' that all works, the question now is how do i change the ItemTemplate 
    ' so that it has the correct number of columns.  Something like this: (pseudo code)
    For each row found in sql command
       ReportListView.ItemTemplate.Add( "<tr>" )
       For each Request.Form as i
            ReportLIstView.ItemTemplate.Add( "<td>" & sqlresult(i) & "</td>" )
       Next
       ReportListView.ItemTemplate.Add( "</tr>" )
    Next
 End Sub

也许还有另一种方法可以解决这个问题，但这是迄今为止唯一的想法。 ASP.NET新手，有什么建议，非常欢迎!谢谢!

Answer 1

我认为你必须采取一些不同的做法。尝试这样的事情:

<table>
    <asp:ListView ID="ListView1" runat="server">
        <ItemTemplate>
            <tr>
               <asp:PlaceHolder Id="PlaceHolder1" runat="server" />
            </tr>
        </ItemTemplate>
    </asp:ListView>
</table>

语法可能并不完美，但请尝试在后面的代码中执行类似的操作:

For Each listItem As ListViewDataItem In ListView1.Items
    Dim plc As PlaceHolder = DirectCast(listItem.FindControl("PlaceHolder1"), PlaceHolder)
    If plc IsNot Nothing Then
        For Each item As String In Request.Form
            plc.Controls.Add(New Literal(String.Format("<td>{0}</td>", item)))
        Next
    End If
Next