c# - error CS0012: The type 'ConnectionStringSettings' is defined in an assembly that is not referenced after upgrading to Visual Studio 2015 -

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i've upgraded visual studio 2013 pro visual studio 2015 (enterprise), , when compile solution, i'm getting following error:

error cs0012: type 'connectionstringsettings' defined in assembly not referenced. must add reference assembly 'system.configuration, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a'.

is there missed during installation process? have manually add reference projects on?

update: yes work after adding reference system.configuration projects, question more why need in visual studio 2015 (it used work without reference in visual studio 2013)

update: explain context: work in team developers work various versions of visual studio (2012 onwards). if developers work visual studio < 2015 forget manually add reference, won't compilation error, ones on vs2015 will. it's important team understand what's happening here :)

i can think of 2 reasons why have add explicit reference system.configuration.dll in vs 2015 when did not have in earlier versions of vs:

  • during solution migration / update, projects' .net framework settings changed newer .net framework. in newer .net framework version, connectionstringsettings type moved different assembly.

    to honest, seems unlikely me, checked.

  • the build system's (msbuild) .targets have changed in vs 2015. previous build targets automatically added references system.configuration.dll assembly, whereas newer build targets don't anymore; why have add missing assembly references manually.

    (note how when create project in visual studio, build system takes care of references mscorlib, system, , system.core. if remove these assembly references, still "there" during compilation. perhaps similar has been going on system.configuration prior vs 2015.)

    i haven't verified this, seems likelier explanation of two.

these attempts @ explaining (aka guesses), perhaps there altogether different reason.


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