asp.net bug? ResouceManager.GetString(string) when string not found, aspx file is executed twice

Question

I tracked down a very weird ... bug...

I found that for some reason, an ASPX page always executed twice.

I tracked it down to this line in a user (asxc) control, I had :

<img src='<%=RS("buildhover")%>'  />

RS is just a helper function that resolves to ResouceManager.GetString("buildhover")

I found that "buildhover" was simply missing from the resx file that was being read. When added, the ASPX page is no longer run twice...

This is very strange and since I use resource files extensively, I am really interested to find out why this is...

This is similar to this post. http://stackoverflow.com/questions/610061/asp-net-page-onload-executes-twice — Adnan Bhatti, Sep 24 '11 at 22:30
This is also related. http://stackoverflow.com/questions/2009092/page-loads-twice-in-google-chrome — Adnan Bhatti, Sep 24 '11 at 22:36
As well as this, http://stackoverflow.com/questions/2153579/page-load-fires-twice-on-firefox-please-help — Adnan Bhatti, Sep 24 '11 at 22:37

kmcc049 · Accepted Answer · 2011-09-24T22:41:05.800

1

When you have an image element with a blank url for the string then it makes a request to the current page. When the resource doesn't exist you get a blank string. So the result of ResouceManager.GetString("buildhover") is an empty string.

Look at the html produced. You will have something like <img src="" />

edited Sep 24 '11 at 22:41

answered Sep 24 '11 at 22:32

kmcc049

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yea thank you, that was it! I never, in my wildest dreams, woudl thinkg that scr='' woudl cause a double laod... thought it must have been releated to the resources manager... thanks again! – Greg Bala Oct 04 '11 at 20:12

score 0 · Answer 2 · answered Sep 24 '11 at 22:33

If you are observing load event twice in a post back in ASP.Net page, check the following:

1.If Page_Load handler defined in Codebehind then AutoEventWireup property should be “false”

Check if you have mistakenly multiple event handlers registered for an event
Src or ImageURL attribute of your image control are defined and not empty (you can put %20 for blank)
bgColor or background is empty

Last two problems usually appears in one browser while disappears in other.

http://devshop.wordpress.com/2008/06/02/aspnet-page-loading-twice/

asp.net bug? ResouceManager.GetString(string) when string not found, aspx file is executed twice

2 Answers2