问题描述:

I'm using asp.net and c#, making a page with ajax updatepanels. When I try and insert the trigger element, I get the error message AsyncPostBackTrigger is not a known element. What am I missing?

<asp:UpdatePanel ID="UdpEPL" runat="server" UpdateMode="Conditional"

Visible="False">

<ContentTemplate>

<Triggers>

<asp:AsyncPostBackTrigger ControlID="BtnEplShowSubmit"

EventName="BtnEplShowSubmit_Click"/>

</Triggers>

</ContentTemplate>

</asp:UpdatePanel>

网友答案:

Remove the Triggers section from your ContentTemplate:

<asp:UpdatePanel ...>
    <Triggers>
       <asp:AsyncPostBackTrigger .../>
    </Triggers>
    <ContentTemplate>

    </ContentTemplate>
</asp:UpdatePanel>
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