尝试在客户端处理AjaxFileUpload控件的uploadStarted事件,并强制对HtmlEditorExtender扩展器的html进行编码:
<script type="text/javascript" >
function uploadStarted(sender, args){
var editor = $find("<%= txtBannerHTML_HtmlEditorExtender.ClientID %>");
editor._editableDiv_submit();
}
</script>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:Button ID="Button1" runat="server" Text="PostBack" />
<asp:TextBox ID="txtBannerHTML" runat="server" Height="130px" Width="100%" TextMode="MultiLine" />
<asp:HtmlEditorExtender ID="txtBannerHTML_HtmlEditorExtender" runat="server" DisplaySourceTab="True"
Enabled="True" TargetControlID="txtBannerHTML">
</asp:HtmlEditorExtender>
<asp:AsyncFileUpload ID="AsyncFileUpload3" runat="server" OnClientUploadStarted="uploadStarted" />