Visual Studio 2019 編譯.Net Core Console項目出現【MSB4018 The "CreateAppHost" task failed unexpectedly】 錯誤

需要測試一個小東東，使用Visual Studio 2019新建了一個.Net Core的Console程序，但是在編譯的時候一直報錯，死活編譯不通過。

錯誤信息：

Severity Code Description Project File Line	Suppression State
Error	MSB4018	The "CreateAppHost" task failed unexpectedly.
System.AggregateException: One or more errors occurred. ---> Microsoft.NET.HostModel.HResultException: 8007006E
   at Microsoft.NET.HostModel.ResourceUpdater.Update()
   at Microsoft.NET.HostModel.AppHost.HostWriter.<>c__DisplayClass2_0.<CreateAppHost>g__UpdateResources|1()
   at Microsoft.NET.HostModel.RetryUtil.RetryOnWin32Error(Action func)
   at Microsoft.NET.HostModel.AppHost.HostWriter.CreateAppHost(String appHostSourceFilePath, String appHostDestinationFilePath, String appBinaryFilePath, Boolean windowsGraphicalUserInterface, String assemblyToCopyResorcesFrom)
   --- End of inner exception stack trace ---
   at Microsoft.NET.HostModel.AppHost.HostWriter.CreateAppHost(String appHostSourceFilePath, String appHostDestinationFilePath, String appBinaryFilePath, Boolean windowsGraphicalUserInterface, String assemblyToCopyResorcesFrom)
   at Microsoft.NET.Build.Tasks.CreateAppHost.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()
---> (Inner Exception #0) Microsoft.NET.HostModel.HResultException: 8007006E
   at Microsoft.NET.HostModel.ResourceUpdater.Update()
   at Microsoft.NET.HostModel.AppHost.HostWriter.<>c__DisplayClass2_0.<CreateAppHost>g__UpdateResources|1()
   at Microsoft.NET.HostModel.RetryUtil.RetryOnWin32Error(Action func)
   at Microsoft.NET.HostModel.AppHost.HostWriter.CreateAppHost(String appHostSourceFilePath, String appHostDestinationFilePath, String appBinaryFilePath, Boolean windowsGraphicalUserInterface, String assemblyToCopyResorcesFrom)<---

---> (Inner Exception #1) System.UnauthorizedAccessException: Access to the path 'D:\VS2019Code\Projects\ConsoleApp9\ConsoleApp9\obj\Debug\netcoreapp3.1\ConsoleApp9.exe' is denied.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.File.InternalDelete(String path, Boolean checkHost)
   at System.IO.File.Delete(String path)
   at Microsoft.NET.HostModel.AppHost.HostWriter.CreateAppHost(String appHostSourceFilePath, String appHostDestinationFilePath, String appBinaryFilePath, Boolean windowsGraphicalUserInterface, String assemblyToCopyResorcesFrom)<---
	ConsoleApp9	C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets	393	

網上的方案有如下，也都進行了嘗試：

• 重啟Visual Studio
• 以管理員身份運行Visual Studio
• 清理解決方案
• 刪除bin目錄下的所有文件

然鵝，均無效，無奈之下繼續尋找解決方案，發現用Process Monitor來監控到底是誰在搞鬼。

點擊下載 Process Monitor.

終於發現了罪魁禍首。

原來是你，讓我花了我一個上午的時間在折騰。

立馬干掉

果然，一切編譯正常，大功告成。