CODEWITHSUNDEEP
c#asp.net-mvcvisual-studiodynamicvisual-studio-2012
Kevin Junghans
Kevin Junghans

Reputation: 17540

C# Dynamic Types Break When Upgrading to Visual Studio 2012

I have a project that was originally developed using Visual Studio 2010 with .Net 4.0. It is a class library that implements a custom MVC 3 controller and it uses a dynamic type. If I open the project in Visual Studio 2012 RTM, without making any changes to the project, I get the following error on the dynamic types:

One or more types required to compile a dynamic expression cannot be found. Are you missing a reference?

I am also getting another error, which is:

Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.Binder.InvokeMember'

They seem to be related issues. I am not sure why Visual Studio 2012 is confused. The Microsoft.CSharp assembly is in the references. If I open the project again in Visual Studio 2010 it compiles just fine. Has anyone come across this issue and know a solution to it?

Upvotes: 2

Views: 1059

Answers (2)

Peter Lamberg
Peter Lamberg

Reputation: 8651

In my case reference to Microsoft.CSharp assembly was missing. I got this error when trying to use JSON.NET, dynamic types and Visual Studio 2012.

Upvotes: 2

Kevin Junghans
Kevin Junghans

Reputation: 17540

The answer turned out to be in a warning that was present when compiling in either VS 2010 and 2012. The warning was:

The predefined type 'System.Runtime.CompilerServices.CallSite' is defined in multiple assemblies in the global alias; using definition from '..\IronJS.Core.0.2.0.1\lib\net40\Microsoft.Scripting.Core.dll'

The project used IronJS and it had a a copy of Microsoft.Scripting and Microsoft.Dynamic in its package that were being referenced. I removed these references and referenced the versions in the global assemblies and everything works fine. Not sure why VS 2012 had a problem with this when VS 2010 did not. Or why it caused the obscure errors.

Upvotes: 1

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