Asp.net User Control or Custom control Property doesnt accept inlineasp.net constract <%= %> is ther

[AleXmanFree]

Hi , I have got problem with passing my inline based value to y user
control (or custom control, no matter which one I use, I have tried
both to make sure it doesnt matter) .
So say I have property called ImagePath and i want to pass my value
through asp.net specific inline cunstruction:
<uc:MyControl runat=server id="someId" ImagePath="<%=
Request.ApplicationPath %>/App_Themes/<%= Page.Theme %>/Images/
ball_.png" />,

problem that in my property I get value exactly word for word:<%=
Request.ApplicationPath %>/App_Themes/<%= Page.Theme %>/Images/
ball_.png , but i Should get it like:
/WebSiteRoot/App_Themes/Green/Images/ball_.png.

For example if I use simple img html tag i works:
<img src="<%= Request.ApplicationPath %>/App_Themes/<%= Page.Theme %>/
Images/ball_.png" />
But if i add runat=server it brokes and i dont see any image coz the
path of image already messy string with <%= and so on.

I tried a lot of attributes to my ImagePath that found in web posts to
let it work (i.e.: [Bindable(true)],[Category("Data")],
[Browsable(true)] and many more) but no result.



Please let me know if you can resolve this interesting trick somehow?

 

[HillBilly]

I was taught to troubleshoot using isolation: test one thing at a time.

So isolate your expressions you are attempting to bind to the page. I also
bring to your attention the use of the root path operator (~) so useful to
resolve paths. I would then isolate the use of Request.ApplicationPath and
get that part of your path correct.

Some parts of your path would look like "~/Images/ball_.png" for example and
I don't even think App_Theme is known to anything but the compiler but I
could be wrong about that as I don't think we can bind the Theme to the page
using an expression which may be why using Server controls vs HTML controls
appears to produce results.

 

[AleXmanFree]

Finally I found a good solution for this case.
Here is very good post of Dave Reed:
http://weblogs.asp.net/infinitiesloop/archive/2006/08/09/The-CodeExpressionBuilder.aspx


The short steps to achieve similar result are:

1) Create a class which inherits ExpressionBuilder:

using System;
using System.Collections.Generic;
using System.Text;
using System.CodeDom;
using System.Web.Compilation;
using System.Web.UI;

namespace Helper.Configurators
{
[ExpressionPrefix("InlineCode")]
public class CodeExpressionBuilder : ExpressionBuilder
{
public override CodeExpression GetCodeExpression(BoundPropertyEntry
entry, object parsedData, ExpressionBuilderContext context)
{
return new CodeSnippetExpression(entry.Expression);
}
}
}

2) register the newly created class in Web.Config:

<expressionBuilders>
<add expressionPrefix="InlineCode"
type="Helper.Configurators.CodeExpressionBuilder"/>
</expressionBuilders>

(it must be putted inside <configuration>)

3) and us it:

CategoryImage='<%$ InlineCode: Request.ApplicationPath+ "/App_Themes/"
+Page.Theme+ "/Images/ball_.png" %>'


Enjoy.

 

[Hillbilly]

I really appreciate your commitment to come back to put this news article
into perspective. I needed more insight into the use of the
ExpressionBuilder class myself. Thanks again...