是否有可能在不同的内容标签作为参数使用控制？ [英] Is it possible to use a control in a different content tag as a parameter?

问题描述

我现在有两个Web控件，一个是的CheckBoxList，另外一个GridView。 GridView的数据配置有在它的查询参数链接到从的CheckBoxList选中的值。然而，当这两个控制是在像这样单独的内容标签：

I currently have two Web Controls, one being a CheckBoxList, and the other a GridView. The GridView's data configuration has a parameter in it's query which is linked to the selected values from the CheckBoxList. However, when the two controls are in separate content tags like so:

<asp:Content ID="ListPanel" runat="server" ContentPlaceHolderID="LeftContent">
    <h3>Pick Info Here</h3>
    <asp:CheckBoxList ID="cbList1" runat="server" 
        DataSourceID="TestDataSource" 
        DataTextField="St" DataValueField="St" RepeatColumns="2">
    </asp:CheckBoxList>
</asp:Content>

<asp:Content ID="ResultsPanel" runat="server" ContentPlaceHolderID="RightContent">
    <asp:GridView ID="gView1" runat="server" 
        AllowPaging="True" AllowSorting="True" 
        AutoGenerateColumns="False" DataSourceID="TestDS1">
        <Columns>
         ... 
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="TestDS1" runat="server" 
    ... 
    SelectCommand="SELECT ST FROM [Table] where ST = ?">
    <SelectParameters>
        <asp:ControlParameter ControlID="cbList1" Name="?" 
            PropertyName="SelectedValue" />
    </SelectParameters>
</asp:SqlDataSource>
</asp:Content>

它正常工作，当我把两个控件在同一＆LT; ASP：内容＆GT; 标记，但事情系统的错误调用分开.InvalidOperationException：找不到控制'cbList1在ControlParameter ？。有没有一种方法，以保持控制分开，或者他们必须是相同的内容标签内？

It works fine when I put both controls in the same <asp:Content> tag, but things call apart with an error of System.InvalidOperationException: Could not find control 'cbList1' in ControlParameter '?'. Is there a way to keep the controls separate, or do they have to be inside the same content tag?

推荐答案

显然，这可以通过prefixing要做的 ContentPlaceHolderID 到控件ID 参数输入的。在我的例子中，code将是：

Apparently this can be done by prefixing the ContentPlaceHolderID to the ControlID of the parameter entry. In my case, the code would be:

SelectParameters>
        <asp:ControlParameter ControlID="LeftContent:cbList1" Name="?" 
            PropertyName="SelectedValue" />
    </SelectParameters>  

由于控制参数从读取是在LeftContent标签。

since the Control the parameter reads from is in the LeftContent tag.

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