Question

我想访问ListView中的按钮btn3。 ListView本身位于Repeater的ItemTemplate中。

<asp:Repeater runat="server" ID="rep1">
    <ItemTemplate>
        <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1">
            ...
            <asp:Button ID="btn3"  runat="server" Text='<%#Eval("likes").ToString()%>'/>  
            ...
        </asp:ListView>
    </ItemTemplate>
</asp:Repeater>

当我尝试在Repeater的btn3事件中访问ItemDataBound时，返回的值为null：

protected void repeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{       
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        Button btn1 = (Button)e.Item.FindControl("Btn3"); // btn1 is null
    }
}

Answer 1

您可以设置ListView的ItemDataBound事件处理程序：

<asp:Repeater runat="server" ID="rep1">
    <ItemTemplate>
        <asp:ListView ID="ListView1" runat="server" OnItemDataBound="ListView1_ItemDataBound" DataSourceID="SqlDataSource1">
            ...
        </asp:ListView>
    </ItemTemplate>
</asp:Repeater>

并在代码隐藏中检索按钮：

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        Button btn3 = e.Item.FindControl("btn3") as Button;
        ...
    }
}

<小时/> 如果您想在Repeater ItemDataBound事件处理程序中执行此操作（但我不确定此时是否填充了ListView）：

protected void repeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{       
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        ListView ListView1 = e.Item.FindControl("ListView1") as ListView;
        List<Button> buttons = new List<Button>();

        foreach (ListViewItem lvItem in ListView1.Items)
        {
            buttons.Add(lvItem.FindControl("Btn3") as Button);
        }

        // Use the list of buttons
        ...
    }
}

如何检索Repeater内部的ListView内的按钮

1 个答案: