问题
When I tried to install the Package in Visual Studio 2017 using below command,
PM> Install-Package Microsoft.IdentityModel -Version 7.0.0
I got the following error
Attempting to gather dependency information for package 'Microsoft.IdentityModel.7.0.0' with respect to project 'Portal.System', targeting '.NETFramework,Version=v4.0'
Install-Package : An error occurred while retrieving package metadata for 'Microsoft.IdentityModel.7.0.0' from source 'nuget.org'.
error occurred while sending the request.
The remote name could not be resolved: 'api.nuget.org' At line:1 char:1
- Install-Package Microsoft.IdentityModel -Version 7.0.0
+ CategoryInfo : NotSpecified: (:) [Install-Package], Exception + FullyQualifiedErrorId : NuGetCmdletUnhandledException, NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
How can I fix this issue.
回答1:
Agree with zivkan, this issue could be related to Internet connection when you're using VS2017.
Especially you need to check if you can access nuget.org website by your IE browser. I think this issue indicates something is wrong with your DNS provider. Please check this point and fix the connections.
In addition: If you're using nuget.org behind proxy, some details about the nuget.config may help.
回答2:
Download latest nuget commandline util from https://www.nuget.org then run below command
nuget.exe locals -clear all
Restart your visual studio. this problem to occur on any system with a fresh installation of Windows/VS/tooling so likely a bug with their installers.
来源：https://stackoverflow.com/questions/57554185/error-caused-when-trying-to-installing-package-in-net