asp:image question

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Last post 05-29-2007 2:28 AM by raheel.hussain. 3 replies.

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asp:image question

05-28-2007, 3:11 AM

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Goldfish
Joined on 01-10-2006, 7:54 PM
Posts 15
Points 18

Can anyone please tell me why the following won't work
<asp:Image ID="id_image" runat="server" ImageUrl="<%= Page.Theme.ToString() %>/images/icon/icon_tack.gif" /> (server control)

but it works for
<img src="/App_Themes/<%= Page.Theme.ToString() %>/images/icon/icon_tack.gif" alt="" /> (not a server contorl)

Thanks

Filed under: image imageURL

Re: asp:image question

05-28-2007, 5:46 AM

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raheel.hussain
Joined on 05-24-2006, 4:00 AM
Dubai, UAE
Posts 225
Points 1,110

following both should work, but rather in the server control, you can just simply specify as below
where the sign of " ~ " denotes the site home and will return the URL of your application.

the reason is that since runat=server makes the control processed/randered on the server side and <%=%> signs are considered as literals and ignored

<asp:Image ID="id_image" runat="server" ImageUrl="~/App_Themes/TestTheme/images/icon/icon_track.gif" /> (server control)
<img src="App_Themes/<%= Page.Theme.ToString() %>/images/icon/icon_track.gif" alt="" /> (not a server contorl)

While TestTheme is the page theme which is hard coded.

As far as I know, if you do not require any further processing over the image, keep it as HTML control

otherwise you need to programmatically control the image URL, in the page load or may be some other event.

Image1.ImageUrl = "~/App_Themes/" + Page.Theme + "/images/icon/icon_track.gif";

regards
raheel

Raheel Hussain
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Re: asp:image question

05-28-2007, 2:01 PM

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Goldfish
Joined on 01-10-2006, 7:54 PM
Posts 15
Points 18

Thanks for your reply raheel.

But I find that
<img src="App_Themes/<%= Page.Theme.ToString() %>/images/icon/icon_track.gif" alt="" /> only works in a Template of a Datalist

If I have a simple page like:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" Theme="default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<body>

<form id="form1" runat="server">

<div>
<img src="App_Themes/<%= Page.Theme.ToString() %>/images/icon/icon_track.gif" alt="" />
</div>
</form>

</body>

</html>

I will get an error saying "The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)". Anyone knows why this happens?

Thanks