One or more types required to compile a dynamic expression cannot be found

Question

I work on an windows phone 7.1 app on Visual Studio 2010. I try to do that:

dynamic dyn = JsonConvert.DeserializeObject(json);
MessageBox.Show(dyn.somevar);

I have this error:

One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll?

I tried to add C:\Program Files (x86)\Microsoft SDKs\Silverlight\v4.0\Libraries\Client\Microsof.CSharp.dll but it doesn't work.

What can I do now?

Answer 1

Dynamic keyword requires .Net Framework 4.0. (and DLR). Windows Phone 7 (and 8) has it's own version of .Net Framework. And dynamic language runtime is not included.

So, you can't use it for Windows Phone development.