Question

我正在尝试使用Search Box that is explained in this blog。问题是我在Repeater中有一个GridView。将根据HiddenField的值生成此GridView。我使用了博客中解释的代码，但是当我尝试在我的情况下使用它时，我收到一个错误，我不知道为什么每次都得到它。我得到的错误来自代码隐藏，错误是：

当前上下文中不存在名称“GridView1”。

如何解决这个错误？

我的ASP.NET代码：

<input id=id_search type=text placeholder="Search">


     <br />  <br />  
        <asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
            <ItemTemplate>

                <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("GroupID")%>' />

                <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                                    ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
                                    SelectCommandType="StoredProcedure" SelectCommand="kbiReport"
                                    FilterExpression="[DivisionName] like '{0}%'">

                    <FilterParameters>
                        <asp:ControlParameter ControlID="ddlDivision" Name="DivisionName" 
                                                 PropertyName="SelectedValue" Type="String" />
                    </FilterParameters>

                    <SelectParameters>
                        <%--ControlParameter is linked to the HiddenField above to generate different GridView based on different values 
                            of GroupID--%>
                        <asp:ControlParameter ControlID="HiddenField1" Name="GroupID" PropertyName="Value" />
                    </SelectParameters>
                </asp:SqlDataSource>

                <asp:GridView ID="GridView1" runat="server" 
                                AllowSorting="True" 
                                CellPadding="3" 
                                DataSourceID="SqlDataSource1" 
                                ClientIDMode="Static"
                                CssClass="mGrid"
                                AlternatingRowStyle-CssClass="alt" 
                                RowStyle-HorizontalAlign="Center" 
                                OnRowDataBound="GridView1_RowDataBound" OnPreRender="GridView1_PreRender">
                    <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
                    <HeaderStyle Font-Bold = "true" ForeColor="Black"/> 
                    <Columns>
                        <asp:CommandField ShowSelectButton="True" />
                    </Columns>
                    <EditRowStyle BackColor="#999999" />
                    <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                    <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
                    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
                    <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
                    <SortedAscendingCellStyle BackColor="#E9E7E2" />
                    <SortedAscendingHeaderStyle BackColor="#506C8C" />
                    <SortedDescendingCellStyle BackColor="#FFFDF8" />
                    <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
                </asp:GridView>

            </ItemTemplate>
        </asp:Repeater>

        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                           ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
                           SelectCommand="SELECT DISTINCT GroupID FROM courses">
        </asp:SqlDataSource>

我的守则 - 背后：

protected void GridView1_PreRender(object sender, EventArgs e)
    {
        if (GridView1.Rows.Count > 0)
        {
            GridView1.UseAccessibleHeader = true;
            GridView1.HeaderRow.TableSection = TableRowSection.TableHeader;
        }
    }

Answer 1

当将控件置于中继器（以及带模板的其他控件）中时，无法直接引用控件。

在您的情况下，事件PreRender由GridView触发，因此sender必须是我的网格：

protected void GridView1_PreRender(object sender, EventArgs e)
{
    var myGrid = sender as GridView;
    if (myGrid.Rows.Count > 0)
    {
        myGrid.UseAccessibleHeader = true;
        myGrid.HeaderRow.TableSection = TableRowSection.TableHeader;
    }
}

如何在GridView中修复此错误？

1 个答案: