VSTS上的持续集成-构建定义：无文件-System.AggregateException

When you build Asp.Net project with a default VSBuild definition, the folder bin\$(BuildConfiguration)\ does not exist. So "Copy Files" task cannot find any files with the default settings. A simple way to fix your issue is add /p:outdir=$(build.artifactstagingdirectory) in "MSBuild Arguments" for VSBuild task as following:

And you can also remove "Copy Files" task since "Publish Build Artifacts" task publishes the files in $(build.artifactstagingdirectory) folder by default and you have set the build output to that folder with the argument added in VSBuild task.

更新：您可以使用以下设置添加“复制文件”任务，以将“ roslyn”文件夹复制到“ bin”文件夹：