我正在尝试通过 NuGet 安装 SignalR 包,但没有看到:
PM> Install-Package SignalR
Install-Package : Unable to find package 'SignalR'.
At line:1 char:1
+ Install-Package SignalR
+ ~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
我怎么解决这个问题?