Question

I have a test website with VS 2008 that just uses code behind files, such as Foo.aspx.cs. Thus, the web server compiles them on the fly. The problem I’m running into is I can’t use any C# 3.0 features. If I do:

var x = 1;

or

public class Foo
{
public int x {get;set;}
}

or

Foo x = new Foo() {x = 5};

Then VS will work fine (everything gets highlighted and Intellisensed), but when I run the site it just throws up compiler errors..

Is there a way to fix this, or do you have to compile a DLL to target the 3.0 runtime? If so that’s insanely lame..

Mike

Answer 1

Oh sweet, I got it figured out! I had to put this in the web.config..

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

I think this is because my web.config was borrowed from a very old project..