VS 2019 未为新项目构建解决方案 [英] VS 2019 not building Solution for new projects

问题描述

我昨天更新了 VS 2019，今天我正在尝试为 asp.net 核心 Web 应用程序创建新项目，项目已创建，但是当我构建解决方案或尝试运行解决方案时，我不断收到以下错误.

I updated VS 2019 yesterday and today i am trying to create new projects for asp.net core web application, project is created but when i build solution or try to run solution i keep getting following error.

Error   MSB4018 The "ResolveTargetingPackAssets" task failed unexpectedly.

完整的错误详情

Severity    Code    Description Project File    Line    Suppression State
Error   MSB4018 The "ResolveTargetingPackAssets" task failed unexpectedly.
System.IO.FileNotFoundException: Could not find file 'C:\Program Files\dotnet\packs\Microsoft.AspNetCore.App.Ref\3.1.2\data\FrameworkList.xml'.
File name: 'C:\Program Files\dotnet\packs\Microsoft.AspNetCore.App.Ref\3.1.2\data\FrameworkList.xml'
   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.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy)
   at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
   at System.Xml.XmlTextReaderImpl.FinishInitUriString()
   at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver)
   at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
   at System.Xml.XmlReader.Create(String inputUri, XmlReaderSettings settings, XmlParserContext inputContext)
   at System.Xml.Linq.XDocument.Load(String uri, LoadOptions options)
   at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.AddReferencesFromFrameworkList(String frameworkListPath, String targetingPackDllFolder, ITaskItem targetingPack, List`1 referenceItems)
   at Microsoft.NET.Build.Tasks.ResolveTargetingPackAssets.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() WebApplicationLoginTest C:\Program Files\dotnet\sdk\3.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets   283 

旧项目我可以运行，问题似乎只与我创建的新项目有关.

Old project i am able to run, problem seems to be only with new project which i create.

这可能是因为我昨天做的 VS 更新

Could this be due to VS update which i did yesterday

推荐答案

我在安装新版 Visual Studio 2019 (16.6.0) 后遇到了同样的问题.

I had the same problem after the install the new version of Visual Studio 2019 (16.6.0).

就我而言，我通过从 Microsoft 页面重新安装 ASP.net core 3.1 解决了这个问题.

In my case, I solved it by REINSTALLING the ASP.net core 3.1 from Microsoft page.

例如，在以下链接中:this

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