Embed A Static Image Resource In A Web Server Control?

Feb 15, 2010

I am going to create a web server control representing a treeview. So I want to use 2 images for + and - for expand/collapse. How can I build this into the control in a way that can be used as image source when rendered on the page?

Since this will be in a compiled web controls library, I don't want to rely on external images in the web application.

Edit: Based on this answer by Andre Kraemer I did the following:

In AssemblyInfo.vb:

<Assembly: System.Web.UI.WebResource("MyCompany.MyWebControls.Resources.plus.gif", "image/gif")>
<Assembly: System.Web.UI.WebResource("MyCompany.MyWebControls.Resources.minus.gif", "image/gif")>

In my RenderContents override:

Dim lPlusImage As New WebControls.Image()
Dim lMinusImage As New WebControls.Image()
lPlusImage.ImageUrl = Page.ClientScript.GetWebResourceUrl(Me.GetType(), "MyCompany.MyWebControls.Resources.plus.gif")
lMinusImage.ImageUrl = Page.ClientScript.GetWebResourceUrl(Me.GetType(), "MyCompany.MyWebControls.Resources.minus.gif")

My Assembly name is MyWebControls.

My Root Namespace is MyCompany.MyWebControls.

The images plus.gif and minus.gif are located in a folder named Resources, and the images have Build Action set to Embedded Resource.

It still does not work. I get no errors. I have tried the generated image url directly in the browser, bot nothing happens, just a blank page.

Note: I tried to use an invalid path in the resource name, and the result was exactly the same, which made me wonder if I need to do something special to map the actual resource to the resource name. I got a 404 Not Found error only if I used different name in the code than what was specified in AssemblyInfo, it had nothing to do with path was pointing to an actual resource!

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