将Web项目发布到文件夹时，日志中会弹出以下错误。
....
Publishing folder /...
Publishing folder bin...
Publishing folder bin/es...
Publishing folder bin/roslyn...
Unable to add 'bin/roslyn/System.IO.FileSystem.dll' to the Web site. Unable to add file 'bin\roslyn\System.IO.FileSystem.dll'. The process cannot access the file because it is being used by another process.
Unable to add 'bin/roslyn/System.IO.FileSystem.Primitives.dll' to the Web site. Unable to add file 'bin\roslyn\System.IO.FileSystem.Primitives.dll'. The process cannot access the file because it is being used by another process.
Unable to add 'bin/roslyn/System.Reflection.Metadata.dll' to the Web site. Unable to add file 'bin\roslyn\System.Reflection.Metadata.dll'. The process cannot access the file because it is being used by another process.
Unable to add 'bin/roslyn/System.Security.Cryptography.Algorithms.dll' to the Web site. Unable to add file 'bin\roslyn\System.Security.Cryptography.Algorithms.dll'. The process cannot access the file because it is being used by another process.
Unable to add 'bin/roslyn/System.Security.Cryptography.Primitives.dll' to the Web site. Unable to add file 'bin\roslyn\System.Security.Cryptography.Primitives.dll'. The process cannot access the file because it is being used by another process.
Unable to add 'bin/roslyn/System.ValueTuple.dll' to the Web site. Unable to add file 'bin\roslyn\System.ValueTuple.dll'. The process cannot access the file because it is being used by another process.
Unable to add 'bin/roslyn/VBCSCompiler.exe' to the Web site. Unable to add file 'bin\roslyn\VBCSCompiler.exe'. The process cannot access the file because it is being used by another process.
Publishing folder bin/zh...
...
Publishing folder Views/WFDefs...
Publish failed. Target file://machine/d$/PATH.
如果我使用网络发布发布它是有效的，但真正的目标不支持网络发布。
注意：VBCSCompiler没有运行。
答案 0 :(得分：2)
我的Visual Studio社区2017应用程序遇到了同样的问题。在我的情况下，解决方案很简单，我只删除了目录bin中的所有文件（C：\ Projects \ DotNet \ ApplicationName \ bin），之后我重新编译了应用程序。
我希望它可以帮到你。
答案 1 :(得分：0)
在Visual Studio 2017社区版中遇到同样的问题。当你的问题出现在谷歌但没有回答时，我想我会加入它。
我发现Process Explorer Sysinternals给了我很多帮助。
打开sysinternals并转到查找 - ＆gt;查找句柄或DLL ...或（Ctrl + F）并搜索保持打开的文件。在我的情况下＆＃34; System.IO.FileSystem.dll＆＃34;
搜索结果显示两个MSBuild实例和一个VBCSCompiler挂在文件上。最糟糕的情况是，我刚刚杀了进程树，构建了项目，一切都很好。