How to call extension methods using Eval in a databound control

Question

I have a simple extension method on the int type so I can do the following:

string timeLength = 61.ToTime() // timeLength will be "1:01"

This works great in code, but I want to use this extension method in a Repeater Template. When databinding I want to do the following:

<%# Eval("LengthInSeconds").ToTime() %>

That didn't work so I tried:

<%# ((int) Eval("LengthInSeconds")).ToTime() %>

and it still didn't work. The JIT compiler is not seeing my extension method and I do have the proper import statement in the page.

My only idea for solving this is to replace the Eval with a Literal control and call the extension method in the code-behind, but either way, I would still like to know why this isn't working.

Thanks

Answer 1

Looks like I get to answer my own question! Asp.Net was compiling the .aspx,.ascx templates using the .Net 2.0 compiler. I needed to add the following to my web.config to make it work

  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CSharp.CSharpCodeProvider,System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="4">
        <providerOption name="CompilerVersion" value="v3.5"/>
        <providerOption name="WarnAsError" value="false"/>
      </compiler>
    </compilers>
  </system.codedom>

I still have to perform the cast to (int) in the Eval, but that at least makes sense to me.