Having a strange problem today. I have managed to get my other problems fixed. My ASP page contains NO controls (so there are no blank image url's that could cause the problem). The program itself, from the VB code behind, gets binary data from a database and does a Response.BinaryWrite(imagedata) to the page. When I run it in Chrome or Firefox, everything works perfectly. When I run in IE, after my code finishes execution, it runs Page_Init again and Page_Load again as if loading for the very first time all over again. The value of postback is always false so there is no way around it. Here is the asp code (as you can see, nothing of interest)...
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="pagenamehere.aspx.vb" Inherits="x.x.x.x.y" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Test</title>
</head>
<body>
</body>
</html>
And the Page_Init and Page_Load signatures are as follows
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
'checks database connection string and handles error if there is one
End Sub
Private Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
'checks user is authenticated to view the image and if so, does the binarywrite
End Sub
I have tried change autoeventwriteup to true and taking off the handles Me.Load etc but with no effect. I've also tried checking the Sender object but nothing changes between the first time the page loads and the unwanted second load of the page.
Lastly, the page loads for the second time straight after the following code
Response.Clear()
Response.ClearContent()
Response.ClearHeaders()
Response.Buffer = True
Response.ContentType = "image/vnd.djvu"
Response.AddHeader("Content-Disposition", "inline;filename=temp.djvu")
Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.BinaryWrite(imagedata)
Response.Flush()
Response.Close()
Straight after Response.Close it will go back to Page_Init. I have tried response.end but it makes no difference. I have tried removing the header, the cache information etc but no luck. Please help!
Thanks
You really shouldn't use
Response.Closelike that*. It's really just for protecting against attacks or other error-type conditions:And it will cause very similar problems to the one you're describing (because it sends a "reset" request to the client). Try updating your code to use Response.CompleteRequest instead, and this should (probably) resolve your "multiple request" issues.
*See this blog post for an in-depth analysis of why: Response.End, Response.Close, and How Customer Feedback Helps Us Improve MSDN Documentation