VS2017调试Android出现"System.IO.FileNotFoundException: Could not load file or assembly 'Mono.Posix, Ve

使用visual studio 2017调试安卓程序，遇见

"System.IO.FileNotFoundException: Could not load file or assembly 'Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756' or one of its dependencies." 

解决方法：

1.下载"Mono.Posix.dll"

2.放到C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\Extensions\Xamarin.VisualStudio目录下。

3.重启visual studio。