UserControl中UpdatePanel中的下拉列表无效

时间:2016-02-16 13:28:18

标签: c# asp.net user-controls updatepanel postback

我在UserControl中有这个代码:

ControlloUtente.ascx

<td>
    <asp:UpdatePanel ID="up" runat="server">
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="ddlE" EventName="SelectedIndexChanged" />
        </Triggers>
        <ContentTemplate>
            <asp:DropDownList ID="ddlE" AutoPostBack="true" runat="server" OnSelectedIndexChanged="ddlE_SelectedIndexChanged">
                <asp:ListItem Text="Text1" Value="1" Selected="True"></asp:ListItem>
                <asp:ListItem Text="Text2" Value="2"></asp:ListItem>
                <asp:ListItem Text="Text3" Value="3"></asp:ListItem>
            </asp:DropDownList>
        </ContentTemplate>
    </asp:UpdatePanel>
</td>

UserControl位于另一个UserControl内:

ListaControlli.ascx

<%@ Register Src="~/BlaBla.ascx" TagName="BlaBla"
TagPrefix="UcBla" %>
<%@ Register Src="~/ControlloUtente.ascx" TagName="ControlloUtente"
TagPrefix="UcCon" %>
<%@ Register Src="~/BlaBla2.ascx" TagName="BlaBla2" 
TagPrefix="UcBla2" %>

那是在已经有UpdatePanel的页面中:

Pagina.aspx

    <%@ Register Src="~/AltroUserControl.ascx" TagName="AUC" TagPrefix="ucAuc" %>
    <%@ Register Src="~/ListaControlli.ascx" TagName="Controlli" TagPrefix="uclControlli" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

    <asp:UpdatePanel ID="upPagina" runat="server" ChildrenAsTriggers="true">
        <ContentTemplate>
            (...)
            <uclControlli:Controlli ID="ucControlli" runat="server" />
            (...)
        </ContentTemplate>
        <Triggers>
            <asp:PostBackTrigger ControlID="ucAuc" />
        </Triggers>
    </asp:UpdatePanel>
</asp:Content>

但是更改下拉列表的值我总是有一个完整的回发。有什么问题吗?

0 个答案:

没有答案