问题
I'm a .NET newbie using VS Code while following an online course on Angular and .NET Core. The course requires the AutoMapper.Extensions.Microsoft.DependencyInjection package to be installed but I keep getting the following errors when I try install any package.
Unable to resolve <package_name> for '.NETCoreApp,Version=v2.2'
Package <package_name> is incompatible with 'all' frameworks in project <csproj_path>
I use the following command to install the package:
dotnet add package AutoMapper.Extensions.Microsoft.DependencyInjection
What I've tried so far:
- Added PackageReference manually into the .csproj file then using dotnet restore - results in the same error (NU1100)
- Cleared the NuGet package cache using dotnet nuget locals all --clear - results in the same error
It was working before when I tried to install the Microsoft.EntityFrameworkCore.Sqlite package at the beginning of the course and now for some reason I can't install any package.
Do note that I'm not able to use the NuGet extension as it's not working behind a corporate proxy.
Any help would be greatly appreciated :)
回答1:
I finally fixed the issue by deleting the NuGet.Config file in C:\Users\<user>\AppData\Roaming\NuGet folder then running dotnet restore
Running dotnet restore created a fresh config file on the folder which i noticed has a different packageSources value than the old one.
The old one had https://www.nuget.org/api/v2/ while the new one had https://api.nuget.org/v3/index.json
I completely forgot that I have VS 2010 (with nuget) installed which was responsible for the old config file and I did not realize that nuget from the dotnet-cli was also using the same old configurations.
来源：https://stackoverflow.com/questions/54785951/unable-to-install-packages-using-dotnet-add-package