Using DataBinding 'Eval' expression in HyperLink 'NavigateURL' property. Appends loads of ASCII 'space' codes onto the end!


 Using ASP.NET 2.0, I am working with an ItemTemplate inside a DetailsView.


<asp:Label ID="lblPollURL" runat="server" Text='<%# Eval("URLPath") %>'></asp:Label>

<asp:HyperLink ID="lnkPollURL" runat="server" NavigateUrl='<%# Eval("URLPath") %>'>Go to</asp:HyperLink>


The label renders just fine, and produces the result 'jonathanshomepage'.

However, the HyperLink NavigateURL results in 'http://localhost:3205/website/jonathanshomepage%20%20%20%20%20%20%20%20%20%20%20%20'

Of course, I would expect the URL stuff to be prepended on the front, but I don't know why all these '%20's are being appended onto the end. I have only put a few of them here to illustrate the point, whereas it actually produces many more than this.

%20 is the ASCII code for a space. So why are all these spaces being stuck on the end here?

Any help much appreciated. This is maddening! I could maybe get round it by programmatically setting the NavigateURL property of the HyperLink (during the 'ItemCreated' event, perhaps?), but I'd rather not have to do this.


11/4/2006 3:43:29 PM 72751 articles. 3 followers. Follow

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Well, I worked out what the problem was. I counted the spaces because I wondered if the quantity would lead to any clues. Sure enough, I found that in total, including non-space characters too, there were 256 characters altogether.

I was using NVARCHAR(256) as the underlying DataType in SQL Server 2005 so wondered why a full 256 character string was being passed back.

Then I looked again, and discovered I'd used an NCHAR(256) instead of an NVARCHAR(256). So... my mistake all along!

Still, I am wondering why the Label control rendered correctly. Are spaces automatically trimmed in some way for this?


11/4/2006 5:17:48 PM

I was using varchar(200) and had this problem.  Change it to nvarchar(200) and still have the problem.  Are you sure this is what fixed your problem?

12/23/2006 4:48:26 AM


Yes, absolutely sure this fixed the problem. I changed from 'NCHAR' which is a fixed size data type to 'NVARCHAR' which is a variable sized data type and that cured the problem.

You were already using a variable size datatype (VARCHAR) and changed it to another variable size datatype (NVARCHAR). As you were already using a variable size datatype I don't think it can have been this that caused you the problem.

1/11/2007 12:14:04 AM
I think way back this field was ntext data dype and was changed to nvarchar which left the spaces in the text string.  I just removed the spaces.
1/21/2007 1:33:59 PM
Maybe you could RTRIM it? Or should that be LTRIM....
1/21/2007 2:09:01 PM

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