在 Visual Studio 2019 的包管理器控制台上离线安装 EPPlus 包时出错

Question

Error message - Install -Package : Exception 'System.AggeratteException' thrown when trying to add source 'https://api.nuget.org/v3/index.json' Please verify all your online package are available. One or more errors occurred. Unable to load the service index for source 'https://api.nuget.org/v3/index.json. An error occurred while sending the request. The underlying connection was closed. an unexpected error occurred on a send. Unable to read data from transport connection: an existing connection was forcibly closed by remote host.

Answer 1

请下载相关的.nupkg文件到本地机器，并在 VS > Tools > Options > NuGet Package Manager > Package Sources 中添加/设置相应的包源，然后使用包管理器控制台离线安装。