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

錯誤資訊：

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
• 以管理員身份執行Visual Studio
• 清理解決方案
• 刪除bin目錄下的所有檔案

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。

點選下載 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。

立馬乾掉

果然，一切編譯正常，大功告成