VS 2019 沒有為新項目構建解決方案

Question

我昨天更新了 VS 2019，今天我正在嘗試為 asp.net 核心 web 應用程序創建新項目，但當我構建解決方案或嘗試運行解決方案時，我不斷收到以下錯誤。

Error   MSB4018 The "ResolveTargetingPackAssets" task failed unexpectedly.

完整的錯誤細節

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 

我能夠運行的舊項目，問題似乎只與我創建的新項目有關。

這可能是由於我昨天所做的 VS 更新

Answer 1

安裝新版 Visual Studio 2019 (16.6.0) 后我遇到了同樣的問題。

就我而言，我通過從 Microsoft 頁面重新安裝 ASP.net 核心 3.1 解決了這個問題。

例如，在以下鏈接中： this