当我在VS2013中的解决方案上运行Update-Package –reinstall时，有时会以错误结束并且所有项目中的packages.config文件都消失了。为什么我的所有packages.config文件都被删除了？
PM> Update-Package –reinstall
Reinstalling 'Microsoft.AspNet.WebApi 5.2.2' in project 'Bidrik.WebAPI'.
Removing 'Microsoft.AspNet.WebApi 5.2.2' from Bidrik.WebAPI.
Successfully removed 'Microsoft.AspNet.WebApi 5.2.2' from Bidrik.WebAPI.
Uninstalling 'Microsoft.AspNet.WebApi 5.2.2'.
...
Successfully removed 'mongocsharpdriver 1.9.2' from Tiny.Render.Pdf.
Uninstalling 'mongocsharpdriver 1.9.2'.
Successfully uninstalled 'mongocsharpdriver 1.9.2'.
Attempting to resolve dependency 'Microsoft.AspNet.WebApi.WebHost (≥ 5.2.2 && < 5.3.0)'.
Attempting to resolve dependency 'Microsoft.AspNet.WebApi.Core (≥ 5.2.2 && < 5.3.0)'.
Attempting to resolve dependency 'Microsoft.AspNet.WebApi.Client (≥ 5.2.2)'.
Attempting to resolve dependency 'Newtonsoft.Json (≥ 6.0.4)'.
Attempting to resolve dependency 'Microsoft.Net.Http (≥ 2.2.22)'.
Attempting to resolve dependency 'Microsoft.Bcl (≥ 1.1.9)'.
Attempting to resolve dependency 'Microsoft.Bcl.Build (≥ 1.0.14)'.
Update-Package : Already referencing a newer version of 'mongocsharpdriver'.
At line:1 char:15
+ Update-Package <<<< –reinstall
+ CategoryInfo : NotSpecified: (:) [Update-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.UpdatePackageCommand