我试图使用nopCommerce(这是写在。net核心)，但当我想运行项目时，我面临52个错误告诉我运行一个nuget包恢复
Assets文件~\obj\project.assets。Json没有找到。运行NuGet包还原生成此文件。Nop.Web.MVC.Testsote
当我使用右键单击解决方案并选择恢复Nuget包时，我得到这样的消息:
所有的包都已经安装，没有什么要恢复的。
但是这52个错误仍然存在，在工具-> NuGet包管理器->管理解决方案的NuGet包中，解决方案上没有安装任何东西，我最近更新了我的VS2017到15.5.4
当前回答
我没有在任何地方发现微软建议的删除“packages”文件夹的方法。
来源:解决包恢复错误
You may encounter build errors due to missing files, with a message saying to use NuGet restore to download them. However, running a restore might say, "All packages are already installed and there is nothing to restore." In this case, delete the packages folder (when using packages.config) or the obj/project.assets.json file (when using PackageReference) and run restore again. If the error still persists, use nuget locals all -clear or dotnet nuget locals all --clear from the command line to clear the global-packages and cache folders as described on Managing the global packages and cache folders.
其他回答
关闭和重新打开Visual Studio为我解决了这个问题，一旦我确定NuGet包已经按照这里张贴的其他答案恢复。
编辑:有时只是尝试重新构建就可以解决问题。
前面提到过，但我只是想再次强调在路径中没有任何空间的重要性!这就是我想要的。我警告过你了。
当我得到这个错误时，对我有用的是添加一个全局变量。json文件，但这可能与使用Paket而不是Nuget有关。
For me it turned out to be a nuget source credentials problem. I had recently changed my password for accessing a nexus server and visual studio was still using the old password when trying to access a nuget on that server through the windows credential manager. To fix it, I had to delete the entry for those outdated credentials in the credential manager and after, when I did a nuget restore, it prompted me for a password letting me enter the new password, which got saved in the credential manager again. You can access the credential manager from the cmd line using CmdKey.exe.
要修复工具> NuGet包管理器>包管理器控制台中的此错误，只需运行:
dotnet restore
出现此错误是因为dotnet cli最初没有创建所需的所有文件。执行dotnet还原会添加所需的文件。
