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[Source] VS2012 Solution to the error when installing AutoMapper in Nuget

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Posted on 7/24/2017 2:07:24 PM | | |
When VS2012 installs AutoMapper under .net 4.0, the following error is reported:

AutoMapper already has the dependencies defined for Standard.Library.

'AutoMapper' already has a dependency defined for 'Standard.Library'.

It seems to be caused by the low Nuget version (VS2012 version 2.83), which does not support the Standard.Library framework.


There are two workarounds:

Method 1
NuGet 2.12 supports the . NETStandard framework, so you need to upgrade NuGet to NuGet 2.12 or above.
However, NuGet 2.12 does not support Visual Studio 2012, so you also need to upgrade Visual Studio to 2013.

Method 2 (Adoption)
Downgrading the version of AutoMapper to a compatible version of NuGet is tested to install 4.1.1 perfectly, and by the way, Microsoft.Bcl is installed, and you can use .Net4.5's await and async
PM> Install-Package AutoMapper -Version 4.1.1
Installing 'AutoMapper 4.1.1'.
Successfully installed 'AutoMapper 4.1.1'.




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