<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        Here is the content.
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="buttonSubmit" />
    </Triggers>
</asp:UpdatePanel>
<br />
<br />
<asp:Button ID="buttonSubmit" runat="server" ToolTip="Submit" OnClick="buttonSubmit_Click" />
</form>

服务器端：

protected void buttonSubmit_Click(object sender,ImageClickEventArgs e)
    {
        ScriptManager.RegisterStartupScript(this,this.Page.GetType(),"alert","alert('It works.')",true);
    }

这有两件让我困惑的事情：@H_301_2@一个是问题只发生在我在IIS上部署并在VS上调试时工作正常.@H_301_2@这两个是如果我删除了上面的两个标签“br”,事件就会被触发.此外,如果我将ImageButton更改为Button,也会触发该事件.

所以,我不知道我是否遗漏了某些东西或误解了ImageButton和Button控件的生命周期.@H_301_2@任何帮助都会非常感激.

测试环境：VS2010,IIS 7.5,IE10(10.0.9200.16484)