Visual Studio 2019 编译.Net Core Console项目出现MSB4018 The "CreateAppHost" task failed unexpec(

Posted 2020-11-26 hand

需要测试一个小东东，使用Visual Studio 2019新建了一个.Net Core的Console程序，但是在编译的时候一直报错，死活编译不通过。

错误信息：

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:VS2019CodeProjectsConsoleApp9ConsoleApp9objDebug
etcoreapp3.1ConsoleApp9.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 Filesdotnetsdk3.1.100SdksMicrosoft.NET.Sdk	argetsMicrosoft.NET.Sdk.targets    393 

网上的方案有如下，也都进行了尝试：

• 重启Visual Studio
• 以管理员身份运行Visual Studio
• 清理解决方案
• 删除bin目录下的所有文件

然鹅，均无效，无奈之下继续寻找解决方案，发现用Process Monitor来监控到底是谁在搞鬼。

点击下载 Process Monitor.

终于发现了罪魁祸首。

原来是你，让我花了我一个上午的时间在折腾。

立马干掉

果然，一切编译正常，大功告成。