Question

尝试在.net Framework 4.7.2应用程序中安装nuget软件包时出现错误：

System.IO.IOException: The process cannot access the file 'D:\PP\packages\Newtonsoft.Json.12.0.2\lib\netstandard1.3\Newtonsoft.Json.dll' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
   at System.IO.File.OpenFile(String path, FileAccess access, SafeFileHandle& handle)
   at System.IO.File.SetLastWriteTimeUtc(String path, DateTime lastWriteTimeUtc)
   at NuGet.Packaging.PackageFolderReader.CopyFiles(String destination, IEnumerable`1 packageFiles, ExtractPackageFileDelegate extractFile, ILogger logger, CancellationToken token)
   at NuGet.Packaging.PackageReaderBase.CopyFilesAsync(String destination, IEnumerable`1 packageFiles, ExtractPackageFileDelegate extractFile, ILogger logger, CancellationToken cancellationToken)
   at NuGet.Packaging.PackageExtractor.<ExtractPackageAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at NuGet.ProjectManagement.FolderNuGetProject.<>c__DisplayClass13_0.<<InstallPackageAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.Common.ConcurrencyUtilities.<ExecuteWithFileLockedAsync>d__2`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at NuGet.ProjectManagement.MSBuildNuGetProject.<InstallPackageAsync>d__36.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.PackageManagement.NuGetPackageManager.<ExecuteInstallAsync>d__85.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__76.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__76.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__76.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__75.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__74.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at NuGet.PackageManagement.UI.UIActionEngine.<ExecuteActionsAsync>d__17.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at NuGet.PackageManagement.UI.UIActionEngine.<>c__DisplayClass12_0.<<PerformActionImplAsync>b__0>d.MoveNext()
Time Elapsed: 00:00:00.9362158
========== Finished ==========

Env。详细信息：

名称：程序包管理器主机
版本：5.4.0.6292
Visual Studio 2019版本：16.4.5
应用程序版本：.Net Framework版本4.7.2

到目前为止已尝试的步骤：

我已重新启动计算机并再次尝试，但仍然是相同的问题。
能够在空白dotnet框架项目中成功安装nuget软件包。

Answer 1

该进程无法访问文件'xxxxxxxNewtonsoft.Json.dll' 因为它正在被另一个进程使用。

正如错误所说，nuget包由另一个进程控制。您可以尝试以下步骤：

1）首先删除C:\Users\xxx\.nuget\packages下全局nuget缓存中的所有nuget包，或使用clean nuget caches。

此外，删除解决方案路径下的packages文件夹（例如D:\PP\）。

2）关闭VS实例，删除.vs隐藏文件夹，bin，obj文件夹。

3）如果在进程浏览器中找到msbuild.exe和devenv.exe，请杀死它们。

4）暂时禁用防病毒软件

5）在VS中重新启动项目，然后尝试步骤3，然后运行restore（右键单击解决方案-> Restore Nuget Packages）以还原已安装的软件包，然后尝试重新安装Newtonsoft.Json nuget软件包。

VS2019 + Dotnet Framework 4.7.2中的Nuget软件包安装问题

1 个答案: