ASP.NET Server Tag Not Parsing in URL Field

Posted on 2014-04-23
Last Modified: 2014-04-24

I'm banging my head against a wall here, and I'm sure this is a simple syntax issue.  I am working with a ListView control, and I'm trying to construct a hyperlink that parses a datafield into the query string of a URL (the page that is being called in the URL serves the image data from the provided filename back as a filestream because the image being called resides in a location outside the application folder.)

<asp:HyperLink	runat="server"
		NavigateUrl='~/ServeFFAttachment.aspx?FileName=<%# Eval("ATTACHMENT_PATH") %>'
	<%# Eval("ATTACHMENT_DESC") %>

Open in new window

The server doesn't choke on the code, but the URL that gets associated with the hyperlink isn't evaluating the server tag (see below.)

http://serverfqdn:55555/ServeFFAttachment.aspx?FileName=<%# Eval("ATTACHMENT_PATH") %>

Open in new window

I should point out that this worked fine before I added the ASPX page to the URL (code below worked...)

<asp:HyperLink	runat='server'
		NavigateUrl='<%# Eval("ATTACHMENT_PATH") %>'
	<%# Eval("ATTACHMENT_DESC") %>

Open in new window

Why does adding "~/ServeFFAttachment.aspx?FileName=" before the Server Tag mess it up??

HELP!!  :-)


Question by:John Parker
LVL 35

Accepted Solution

Robert Schutt earned 500 total points
ID: 40018381
When you want to include a binding value in the url attribute, the whole value needs to be generated from within the asp tags.

One possible way would be:
NavigateUrl='<%# Eval("ATTACHMENT_PATH", "~/ServeFFAttachment.aspx?FileName={0}") %>'

Open in new window

Note that the query parameter in your generated url should actually be url encoded to make valid html, if that's important in your case you could try something like:
NavigateUrl='<%# String.Format("~/ServeFFAttachment.aspx?FileName={0}", HttpUtility.UrlEncode(Eval("ATTACHMENT_PATH"))) %>'

Open in new window


Author Closing Comment

by:John Parker
ID: 40021012

That was it!  Thank you very much for the quick response!  I did have to make one minor change to the use of the URLEncoded function...  I had to add the ToString method to the Eval function for it to work.  Otherwise the compiler didn't like it.

NavigateUrl='<%# String.Format("~/ServeFFAttachment.aspx?FileName={0}", HttpUtility.UrlEncode(Eval("ATTACHMENT_PATH").ToString())) %>' 

Open in new window

Thanks again!


Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question