asp.net-core - Visual Studio 2017-无法加载文件或程序集'System.IO.FileSystem

Question

我刚刚将Visual Studio升级到最新版本(1/30/2017)。
我的ASP.NET Core项目在升级之前可以正常工作，但是现在出现以下错误使我停下来。有什么简单的解决方案吗？

Severity    Code    Description Project File    Line    Suppression State
Error   MSB4018 The "ResolvePackageDependencies" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load file or assembly 'System.IO.FileSystem, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.IO.FileSystem, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at Microsoft.NET.Build.Tasks.LockFileCache.LoadLockFile(String path)
   at Microsoft.NET.Build.Tasks.LockFileCache.GetLockFile(String path)
   at Microsoft.NET.Build.Tasks.ResolvePackageDependencies.get_LockFile()
   at Microsoft.NET.Build.Tasks.ResolvePackageDependencies.ReadProjectFileDependencies()
   at Microsoft.NET.Build.Tasks.ResolvePackageDependencies.ExecuteCore()
   at Microsoft.NET.Build.Tasks.TaskBase.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()

Answer 1

解决此问题的最简单方法是创建一个新的ASP.NET Core应用程序，检查其.csproj文件并基于该文件修改旧项目。许多事情似乎已被删除和简化，在这里列出太多内容。