问题是您的函数ProcessFile未在Powershell会话中加载.

The problem is that your function ProcessFile isn't loaded in powershell session.

尝试以这种方式加载脚本:

Try loading you script in this way:

. .\myscript.ps1

通过这种方式，您在我的系统中的代码可以正常工作！

In this way your code in my system works!

了解有关 Dot Sourcing Powershell中的脚本.

Read about Dot Sourcing a script in powershell.