SharePoint 2010 Dynamic Compilation of .aspx and .ascx Files with .NET 3.5
What’s the problem?
One of our colleagues, Petri, had a problem with using extension methods in his Visual Web Parts user control (.ascx file). He had developed some extension methods and tried to use them in user control:
And all he got was this error:
'System.DateTime' does not contain a definition for 'SomeExtensionMethod'
So it seems like this was compiled with a wrong compiler, and this was further revealed by looking at detailed compiler output:
Clearly not a .NET 3.5 C# compiler. All I can say is, that SharePoint is not fully compatible with .NET Framework 3.5 out-of-the-box. You cannot use 3.5 language constructs (inline code) in dynamically compiled files by default, unless…
What’s the solution?
Christian had dealed with this same problem about a year ago, so all the respect for him in documenting the problem.
To fix this issue, you need to add the following in you web application’s web.config inside configuration-element (here is C# example):
<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>
You can also use WebConfigModification classes or server-wide web.config merging to make this change in web.config.
Here is your SharePoint 2010 web.config.net35.xml merge file:
<actions>
<add path="configuration" id="{57DFD0C8-7E2D-4815-9B36-FD165903D775}">
<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>
</add>
</actions>
Place the web.config.net35.xml in 14\CONFIG folder and run (or do your PowerShell magic):
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