Visual Studio 2010: Could not resolve mscorlib for target framework '.NETFramework,Version=v4.0'

Question

We are currently migrating all our solutions from 2005 to 2010 (that\'s right, we\'re skipping 2008!). We are also changing our file structure to make some more sense (some

Answer 1

I had this problem in Visual Studio 2013 when going from .NET 4.5 to .NET 4.6.2. The problem project was a website project.

Visual Studio automatically runs some tool which generates Reference.svcmap. The Reference.cs starts with:

//------------------------------------------------------------------------------
// 
//     This code was generated by a tool.
//     Runtime Version:4.0.30319.42000
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// 
//------------------------------------------------------------------------------

Just picking the new .NET version caused Visual Studio to clean out the generated files and not fill the contents back. I tried all the solutions above but none worked. Eventually I picked .NET 4.5.1 followed by .NET 4.6.2 and the tool did run. The difference in the files was only the version number of the tool which was in a comment, so I could have recovered the files from GIT.