Unable to restore Packages when i change target framework from 4.5 to 4.8 using NugetPackage Manager

Question

I changed target framework from 4.5 to 4.8.
When I am trying to build, packages are not restore correctly.

It seems my NugetPackage manager has problem.

I added packages sources in nuget package manger in Tools-> options.
But it is not saving. I have installed nuget package manger and installed again.
But it is not working.
Could you please advise what to do with this.

Answer 1

Hi @Rama Krishna boyina ,

Welcome to Microsoft Q&A forum.

Please navigate to %APPDATA%\NuGet( C:\Users\Admin\AppData\Roaming\NuGet ), then open NuGet.Config file, and check if the related package sources keys are added, for example:

  <packageSources>  
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />  
    <add key="Microsoft Visual Studio Offline Packages" value="C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\" />  
  </packageSources>  

If there is no NuGet.Config file, please try to create a new NuGet.Config file. If there are no added package sources, please try to add several package sources that you want. You can refer to this doc: Nuget.config reference. After that restart VS and check Tools > NuGet Package Manager > Package Manager Settings > Package Sources.

Besides, which version of Visual Studio are you using? Please also try to create a new solution and test if this issue appears on the newly created solution.

Best Regards,
Tianyu

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Answer 2

Hi TianyuSun,

Thank you for your response.
I have verified my project. I am using visual studio 2017.
I have nagivated to path (C:\Users\Admin\AppData\Roaming\NuGet) and found the file nuget.config.
In this file I have only one entry.

<packageSources>
<add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
</packageSources>

I tried with new project. NuGet Package Manager > Package Manager Settings > Package Sources is populated. But my existing project it is populated.

Please advise