前端之家

  1. 首页
  2. 问答

dotnet恢复：检索软件包时发生错误...元数据根元素丢失

• 问答

我遇到了一个nuget / docker构建问题，我花了几天的时间进行调试，但想法不见了：您知道为什么我遇到以下错误吗？

问题在于一个asp.net核心解决方案（其他非常相似的解决方案不受影响）：尽管我可以使用docker compose文件在Visual Studio 2019中构建受影响的解决方案，但无法使用dockerfile起作用，因此docker build命令无法运行。

如果我通过在命令提示符下进行以下构建来运行dockerfile：

docker build -f MStoreBosGateway/MStoreBosGatewayApi/Dockerfile --pull --no-cache -t mstorebosgateway:0.041 .

然后出现以下错误：

Step 11/26 : RUN dotnet restore "MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj"
>  ---> Running in 30819cb5db4f
> /usr/share/dotnet/sdk/2.2.402/NuGet.targets(123,5): error : An error
> occurred while retrieving package metadata for
> 'System.Text.Encodings.Web.4.5.0' from source
> '/usr/share/dotnet/sdk/NuGetFallbackFolder'.
> [/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj]
> /usr/share/dotnet/sdk/2.2.402/NuGet.targets(123,5): error :   Root
> element is missing.
> [/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj]
> The command '/bin/sh -c dotnet restore
> "MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj"'
> returned a non-zero code: 1

我在dockerfile中的每一行之后都放置了RUN echo命令，因此看起来是造成此问题的dotnet还原。如果我自己运行dotnet restore命令，则运行正常。

为解决此问题，我做了很多事情，例如

  • -从该解决方案和项目中删除obj和bin文件夹，
  • -已卸载并重新安装的nuget，
  • -删除了nuget缓存以强制重新下载软件包，
  • -卸载并重新安装dotnet core sdks，
  • -从项目文件中删除了错误消息（'System.Text.Encodings.Web.4.5.0）中提到的包（这样做 不会导致任何错误，因此无论如何都必须是多余的）。那确实 不会影响此错误，它会还原此软件包，因此必须有 还有其他事情说要使用此软件包或可能的系统软件包 还是默认情况下都包含了。

我的同事可以构建此项目，并已将其可以复制的副本发送给我；我在构建他的副本时遇到了同样的问题，因此假设它在项目外部。

如果我在docker文件中的dotnet restore命令中添加了“ –verbosity details”，则在输出下方添加了

。 
           GET https://api.nuget.org/v3-flatcontainer/microsoft.extensions.dependencyinjection.abstractions/index.json
           OK https://api.nuget.org/v3-flatcontainer/aspnet.security.oauth.validation/index.json 342ms
           GET https://api.nuget.org/v3-flatcontainer/aspnet.security.oauth.validation/2.0.0/aspnet.security.oauth.validation.2.0.0.nupkg
           OK https://api.nuget.org/v3-flatcontainer/aspnet.security.oauth.validation/2.0.0/aspnet.security.oauth.validation.2.0.0.nupkg 52ms
           GET https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.authentication/index.json
           GET https://api.nuget.org/v3-flatcontainer/newtonsoft.json/10.0.2/newtonsoft.json.10.0.2.nupkg
     1>/usr/share/dotnet/sdk/2.2.402/NuGet.targets(123,5): error : An error occurred while retrieving package metadata for 'System.Text.Encodings.Web.4.5.0' from source '/usr/share/dotnet/sdk/NuGetFallbackFolder'. [/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj]
/usr/share/dotnet/sdk/2.2.402/NuGet.targets(123,5): error :   Root element is missing. [/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj]
           OK https://api.nuget.org/v3-flatcontainer/swashbuckle.aspnetcore.swaggergen/index.json 156ms
           GET https://api.nuget.org/v3-flatcontainer/swashbuckle.aspnetcore.swaggergen/4.0.1/swashbuckle.aspnetcore.swaggergen.4.0.1.nupkg
           OK https://api.nuget.org/v3-flatcontainer/swashbuckle.aspnetcore.swaggerui/index.json 160ms
           GET https://api.nuget.org/v3-flatcontainer/swashbuckle.aspnetcore.swaggerui/4.0.1/swashbuckle.aspnetcore.swaggerui.4.0.1.nupkg
           OK https://api.nuget.org/v3-flatcontainer/automapper/index.json 155ms
           GET https://api.nuget.org/v3-flatcontainer/automapper/8.0.0/automapper.8.0.0.nupkg
           OK https://api.nuget.org/v3-flatcontainer/swashbuckle.aspnetcore.swaggergen/4.0.1/swashbuckle.aspnetcore.swaggergen.4.0.1.nupkg 44ms
           OK https://api.nuget.org/v3-flatcontainer/swashbuckle.aspnetcore.swaggerui/4.0.1/swashbuckle.aspnetcore.swaggerui.4.0.1.nupkg 49ms
           GET https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.mvc.apiexplorer/index.json
           GET https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.mvc.core/index.json
           GET https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.mvc.dataannotations/index.json
         NuGet.Protocol.Core.Types.Fatalprotocolexception: An error occurred while retrieving package metadata for 'System.Text.Encodings.Web.4.5.0' from source '/usr/share/dotnet/sdk/NuGetFallbackFolder'. ---> NuGet.Packaging.Core.PackagingException: An error occurred while retrieving package metadata for 'System.Text.Encodings.Web.4.5.0' from source '/usr/share/dotnet/sdk/NuGetFallbackFolder'. ---> system.xml.XmlException: Root element is missing.
            at system.xml.XmltextreaderImpl.Throw(Exception e)
            at system.xml.XmltextreaderImpl.ParseDocumentContent()
            at system.xml.XmltextreaderImpl.Read()
            at system.xml.Linq.XDocument.Load(XmlReader reader,LoadOptions options)
            at NuGet.Packaging.Core.NuspecCoreReaderBase.LoadXml(Stream stream,Boolean leaveStreamOpen)
            at NuGet.Packaging.Core.NuspecCoreReaderBase..ctor(Stream stream,Boolean leaveStreamOpen)
            at NuGet.Packaging.NuspecReader..ctor(Stream stream)
            at NuGet.Protocol.LocalPackageFileCache.GetNuspec(String manifestPath,String expandedPath)
            at NuGet.Protocol.LocalPackageFileCache.<>c__DisplayClass6_1.<GetOrAddNuspec>b__1()
            at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
            at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication,Boolean useDefaultConstructor)
            at System.Lazy`1.CreateValue()
            at NuGet.Protocol.LocalV3FindPackageByIdResource.ProcessnuspecReader[T](String id,NuGetVersion version,Func`2 process)
            --- End of inner exception stack trace ---
            --- End of inner exception stack trace ---
            at NuGet.Protocol.LocalV3FindPackageByIdResource.ProcessnuspecReader[T](String id,Func`2 process)
            at NuGet.Protocol.LocalV3FindPackageByIdResource.GetDependencyInfoAsync(String id,SourceCacheContext cacheContext,ILogger logger,CancellationToken cancellationToken)
            at NuGet.Commands.SourceRepositoryDependencyProvider.GetDependenciesCoreAsync(libraryIdentity match,NuGetFramework targetFramework,CancellationToken cancellationToken)
            at NuGet.Commands.SourceRepositoryDependencyProvider.<>c__DisplayClass21_0.<<GetDependenciesAsync>b__0>d.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at NuGet.Commands.SourceRepositoryDependencyProvider.GetDependenciesAsync(libraryIdentity libraryIdentity,CancellationToken cancellationToken)
            at NuGet.DependencyResolver.ResolverUtility.CreateGraphItemAsync(RemoteMatch match,NuGetFramework framework,CancellationToken cancellationToken)
            at NuGet.DependencyResolver.ResolverUtility.FindlibraryEntryAsync(libraryRange libraryRange,String runtimeIdentifier,RemoteWalkContext context,CancellationToken cancellationToken)
            at NuGet.DependencyResolver.RemoteDependencyWalker.CreateGraphNode(libraryRange libraryRange,String runtimeName,RuntimeGraph runtimeGraph,Func`2 predicate,GraphEdge`1 outerEdge)
            at NuGet.DependencyResolver.RemoteDependencyWalker.CreateGraphNode(libraryRange libraryRange,GraphEdge`1 outerEdge)
            at NuGet.Commands.ProjectRestoreCommand.WalkDependenciesAsync(libraryRange projectRange,RemoteDependencyWalker walker,CancellationToken token)
            at NuGet.Commands.ProjectRestoreCommand.TryRestoreAsync(libraryRange projectRange,IEnumerable`1 frameworkRuntimePairs,NuGetv3LocalRepository userPackageFolder,IReadOnlyList`1 fallbackPackageFolders,RemoteDependencyWalker remoteWalker,Boolean forceRuntimeGraphCreation,CancellationToken token,Telemetryactivity telemetryactivity)
            at NuGet.Commands.RestoreCommand.ExecuteRestoreAsync(NuGetv3LocalRepository userPackageFolder,Telemetryactivity telemetryactivity)
            at NuGet.Commands.RestoreCommand.ExecuteAsync(CancellationToken token)
            at NuGet.Commands.RestoreRunner.ExecuteAsync(RestoreSummaryRequest summaryRequest,CancellationToken token)
            at NuGet.Commands.RestoreRunner.ExecuteAndCommitAsync(RestoreSummaryRequest summaryRequest,CancellationToken token)
            at NuGet.Commands.RestoreRunner.CompletetaskAsync(List`1 restoretasks)
            at NuGet.Commands.RestoreRunner.RunAsync(IEnumerable`1 restoreRequests,RestoreArgs restoreContext,CancellationToken token)
            at NuGet.Commands.RestoreRunner.RunAsync(RestoreArgs restoreContext,CancellationToken token)
            at NuGet.Build.Tasks.Restoretask.ExecuteAsync(ILogger log)
       Done executing task "Restoretask" -- FAILED.
     1>Done building target "Restore" in project "MStoreBOSGatewayApi.csproj" -- FAILED.
     1>Done Building Project "/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj" (Restore target(s)) -- FAILED.

Build FAILED.

       "/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj" (Restore target) (1) ->
       (Restore target) ->
         /usr/share/dotnet/sdk/2.2.402/NuGet.targets(123,5): error : An error occurred while retrieving package metadata for 'System.Text.Encodings.Web.4.5.0' from source '/usr/share/dotnet/sdk/NuGetFallbackFolder'. [/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj]
       /usr/share/dotnet/sdk/2.2.402/NuGet.targets(123,5): error :   Root element is missing. [/src/MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj]

    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:04.70
The command '/bin/sh -c dotnet restore "MStoreBOSGateway/MStoreBOSGatewayApi/MStoreBOSGatewayApi.csproj" --verbosity detailed' returned a non-zero code: 1

C:\Applications\VB2017Apps\MStoreBOSGateway>
pwlsiynice 回答：dotnet恢复：检索软件包时发生错误...元数据根元素丢失
暂时没有好的解决方案，如果你有好的解决方案，请发邮件至：iooj@foxmail.com
asp.net-core-mvcdocker-builddockerfiledotnet-restorenuget
本文链接：https://www.f2er.com/3165228.html

大家都在问