keywords: [UE4]VS2017编译构建引擎代码：Could not load file or assembly ‘System.Threading.Tasks.Dataflow

如果用VS2017编译构建引擎代码，在双击GenerateProjectFiles.bat时出现以下错误：

Setting up Unreal Engine 4 project files...
MSBUILD : error MSB1025: An internal failure occurred while running MSBuild.
Microsoft.Build.Shared.InternalErrorException: MSB0001: Internal MSBuild Error: Throwing from logger shutdown
=============
System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks.Dataflow, Version=4.5.24.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Threading.Tasks.Dataflow, Version=4.5.24.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at Microsoft.Build.BackEnd.Logging.LoggingService.ShutdownComponent()
   at Microsoft.Build.Evaluation.ProjectCollection.ShutDownLoggingService()

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].


 ---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks.Dataflow, Version=4.5.24.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
   at Microsoft.Build.BackEnd.Logging.LoggingService.ShutdownComponent()
   at Microsoft.Build.Evaluation.ProjectCollection.ShutDownLoggingService()
   --- End of inner exception stack trace ---
   at Microsoft.Build.Shared.ErrorUtilities.ThrowInternalError(String message, Exception innerException, Object[] args)
   at Microsoft.Build.Evaluation.ProjectCollection.ShutDownLoggingService()
   at Microsoft.Build.Evaluation.ProjectCollection.Dispose(Boolean disposing)
   at Microsoft.Build.CommandLine.MSBuildApp.BuildProject(String projectFile, String[] targets, String toolsVersion, Dictionary`2 globalProperties, ILogger[] loggers, LoggerVerbosity verbosity, DistributedLoggerRecord[] distributedLoggerRecords, Boolean needToValidateProject, String schemaFile, Int32 cpuCount, Boolean enableNodeReuse, TextWriter preprocessWriter, Boolean debugger, Boolean detailedSummary)
   at Microsoft.Build.CommandLine.MSBuildApp.Execute(String commandLine)

Unhandled Exception: Microsoft.Build.Shared.InternalErrorException: MSB0001: Internal MSBuild Error: Throwing from logger shutdown
=============

原因：没有安装Microsoft Build Tools 2015，vs2017安装器没有包含这个工具，需要单独下载安装：
https://www.microsoft.com/en-us/download/details.aspx?id=48159

黛蛾长敛，任是春风吹不展，困倚危楼，过尽飞鸿字字愁。—秦观《木兰花》