'Newtonsoft.Json' already has a dependency defined for 'Microsoft.CSharp'

.net json.net jsonparser
Vin.X picture Vin.X · Jun 13, 2017 · Viewed 60.9k times · Source

I'm installing NewtonSoft.Json for parsing Json in .NET application. When I'm using Visual Studio(VS) 2012, it can not be installed via NuGet. This is the error I have got:

'Newtonsoft.Json' already has a dependency defined for 'Microsoft.CSharp'

I tried to copy the DLL over and just use it, seems like some dependencies screwed up in this version (10.0.2).

After few hours research, finally I've found out it is the problem of the compatibility of VS2012 and Newtonsoft Json 10.0.2.

Answer

Vin.X picture Vin.X · Jun 13, 2017

because NuGet Package Manager (Version 2.8.60318.667) for VS 2012 does not support .NETStandard (Used for Latest Newtonsoft Json Parser Lib. https://github.com/NuGet/Home/issues/3131

I resolve this issue by installing older version of Newtonsoft Json:

PM> Install-Package Newtonsoft.Json -Version 9.0.1

More details on: https://github.com/NuGet/Home/issues/5162 .

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