Question:
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Function doSomething($param1 $param2 $file) { ...doing stuff $pos = $file.IndexOf('.') } doSomething -param1 'stuff' -param2 'more stuff' -file 'C:\test.txt' |
Returns error: Method invocation failed because [System.IO.FileInfo] doesn’t contain a method named ‘IndexOf’.
But calling it outside a function or from the command line works with out issue.
Is this a limitation of powershell or is there some trick to calling string functions inside powershell functions?
Thanks for the help!
Answer:
IndexOf is a method of type string. I suspect that somewhere in ...doing stuff, you’re operating on $file in such a way that it becomes treated as a System.IO.FileInfo.
I suspect this in part because I’ve tried to replicate it in my environment and got it to work:
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function doSomething ($file) { # This gets the index of . in 'C:\test.txt', which should be at position 7. $pos = $file.IndexOf('.') $pos $file.GetType() } doSomething -file 'C:\test.txt' 7 IsPublic IsSerial Name BaseType -------- -------- ---- -------- True True String System.Object |
Are you operating on $file at all, or using it to modify other files? If you are and don’t mind the object being a [System.IO.FileInfo], you can use $file.fullname to get your path string back. This assumes that you haven’t modified it in such a way that it has become a collection of FileInfo objects.