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POASP.Net: asynchronous image upload displayed using handler
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copied!<p>I have a really specific question for which I don't think I will have an answer but... let's try! I have an aspx web page that works perfectly with Firefox and Chrome but not on IE9 (don't feed the troll ^^).</p> <p>My objective is to allow an asynchronous image upload using ASP AjaxControlToolkit (see <a href="http://www.asp.net/ajaxlibrary/AjaxControlToolkitSampleSite/asyncfileupload/asyncfileupload.aspx" rel="nofollow">http://www.asp.net/ajaxlibrary/AjaxControlToolkitSampleSite/asyncfileupload/asyncfileupload.aspx</a> for a demo). When the image asynchronous upload is finished, the UploadedComplete function is called and I put the image in a session variable :</p> <pre><code>if (fileSizeOk && fileTypeOk) Session["image"] = this.AsyncFileUploadLogo.FileBytes; </code></pre> <p>In parallel I have a handler responsible for returning an image from the session variable :</p> <pre><code>byte[] buffer = (byte[])context.Session["image"]; context.Response.OutputStream.Write(buffer, 0, buffer.Length); context.Response.OutputStream.Flush(); </code></pre> <p>Then, in my aspx page, I have an asp:Image field in a UpdatePanel that asks to the handler to get the image every five second :</p> <pre><code><asp:UpdatePanel ID="UpdatePanelLogo" runat="server"> <ContentTemplate> <asp:Image ID="ImageFileUploaded" runat="server" ImageUrl="AsyncImageHandler.ashx" /> <asp:Timer ID="TimerFileUploaded" Interval="5000" runat="server" /> </ContentTemplate> </asp:UpdatePanel> </code></pre> <p>When the user validates the form, I just have to get the variable from the session and I save the image in database with the other values.</p> <p>Here is my problem: with Firefox and Chrome, the timer provokes the reloading of the image but with IE (even IE9) the image is only displayed after hitting F5. When I put a breakpoint in the handler I can see that it's never called with IE (maybe a caching mechanism?).</p> <p>Do you have an idea of how to solve this problem?</p> <p>Thanks for your answers!</p>

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