Installing json.NET via NuGet error 'Newtonsoft.Json' already has a dependency defined for Microsoft C#

Question

I'm using Visual Studio(VS) 2010 Ultimate (with .NET 4.0) to install Json.NET (10.0.2) but get failed with error message:

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

I've tried to search solution for this and tried many ways like: update NuGet Package. but unfortunately, it didn't work. What is to be done?

More tried update:

The version of NuGet Package: 2.8.60318.667
Install Json.net version: 9.0.1 without problem

RBT · Accepted Answer · 2020-01-08 05:59:07Z

1

I tried this solution and it worked for me:

Tool -> NuGet Packages Manager - Manage Nuget Package for Solution
Select Online tab and search online for Nuget.CommandLine -> install it
After installing, you can find nuget.exe in your Current Project folder -> Packages -> NuGet.CommandlineXXX
Run CMD and use command install to install latest version of Json.NET
Back to Project -> add reference - Browse for DLL file

Done!

edited Jan 8, 2020 at 5:59

RBT

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answered Apr 27, 2017 at 7:17

binh

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RBT · Accepted Answer · 2020-01-08 08:31:16Z

0

Please check the version of .NET Framework you are using. There are chances that previous frameworks such as v3.5 or below doesn't support latest version of JSON.

Or this would help you : NuGet: 'X' already has a dependency defined for 'Y'

edited Jan 8, 2020 at 8:31

RBT

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answered Apr 18, 2017 at 9:57

Kingsman

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5 Comments

Kingsman Over a year ago

Which version of NuGet are you using? Here are steps to check : learn.microsoft.com/en-us/nuget/policies/…

binh Over a year ago

Name : Package Manager Host Version : 2.8.60318.667 InstanceId : 3d141890-c5fa-4574-b12d-5f874451178b UI : System.Management.Automation.Internal.Host.InternalHostUserInterface CurrentCulture : en-US CurrentUICulture : en-US PrivateData : NuGetConsole.Host.PowerShell.Implementation.NuGetPSHost+Commander DebuggerEnabled : True IsRunspacePushed : False Runspace : System.Management.Automation.Runspaces.LocalRunspace

Kingsman Over a year ago

My buddy was facing same problem, please try uninstalling current JSON version and reinstall updated version. It worked for him. *Please make sure you do this for a separate dummy project first, if it works then try it for your project.

binh Over a year ago

I did uninstall old version and install latest one but no luck

Kingsman Over a year ago

I am out of options mate !

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