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
造成这个缺陷的原因:你必须在文件资源管理器中删除注入的Nuget。 解决方案:一旦你在你的系统中删除了Nuget，然后从下面的位置删除。 选择工具=>选项=>NuGet包管理器=>包源，然后取消勾选Microsoft Visual Studio离线包选项
其他回答
对我来说，我把NuGet.exe从3.4升级到4.9，因为3.4不理解如何恢复。net Core的包。
有关详细信息，请参见teamcity的dotnet恢复与nuget恢复
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。
您将从“https://api.nuget.org/v3/index.json”获得所需的软件包。将此添加到包资源中。同时确保其他包暂时未选中。在“解决方案资源管理器”中单击“恢复原始包”
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.
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 To fix it, I had to delete the entry for those outdated credentials in the credential manager and after, when I did a nuget restore, it prompted me for a password letting me enter the new password, which got saved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.
