ASP.NET dynamic image url using server tags

Question

I am trying to set the ImageUrl using the following code...

<asp:Image ID="brokenImage" runat="server" AlternateText="Coded path" ImageUrl='~/headerImages/<%= getImage(Request.QueryString["Id"]) %>'/>

Eliminating the opening tag and viewing the browser ouput alongside an image tag that is explicitly written produces the following results....

asp:Image ID="brokenImage" runat="server" AlternateText="Coded path" ImageUrl='~/headerImages/images (3).jpg' />

asp:Image ID="workingImage" runat="server" AlternateText="Explicit Path" ImageUrl="~/headerImages/images (3).jpg" />

Why is the first image not displaying but the second is? How can I pass a parameter to the code behind and set the url?

If the browser output includes asp:Image tags then something much more fundamental is broken here. That would indicate that your web server isn't doing server-side ASP.NET processing. — David
– David, Commented Jan 15, 2014 at 20:46
is query string holding the extension of the image like .jpg or id only ? — mohammed momn
– mohammed momn, Commented Jan 15, 2014 at 20:47

Community · Accepted Answer · 2017-05-23 12:29:16Z

3

If you are looking for correct way to do this, your markup should be :

<asp:Image ID="brokenImage" runat="server" AlternateText="Coded path" ImageUrl='<%# "~/headerImages/" + getImage(Request.QueryString["Id"]) %>'/>

And in the code you should have this:

brokenImage.DataBind();

Explanation: <%= %> outputs directly to the response stream. And <%# %> evaluates the code when you bind the control. Very nice and short explanation here.

edited May 23, 2017 at 12:29

CommunityBot

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answered Jan 15, 2014 at 21:26

afzalulh

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