Vista - Test-Path '' -IsValid does not return False but fails. Is this OK?

Test-Path $Path -IsValid fails with ParameterBindingValidationException
(Test-Path : Cannot bind argument to parameter 'Path' because it is...) is
$Path is null or an empty string.

As a result one has to check validity of $Path in this way:
if ($Path -and (Test-Path $Path -IsValid)) {...}

Is this intentional?

--
Thanks,
Roman Kuzmin
PowerShellFar and FarNET: http://code.google.com/p/farnet/

There is no default value for -path (as opposed to get-childitem which lists
the current directory), so it fails.
You need to validate $path prior to testing it. -isValid can only run if
the $path is not null or empty.

You can see it by running:

PS > test-path
cmdlet test-path at command pipeline position 1
Supply values for the following parameters:
Path[0]:
Test-Path : Cannot bind argument to parameter 'Path' because it is an empty
array.
At line:1 char:9
+ test-path <<<<

Is it intensional? I think it is. Here's what the help says (it's required):

PARAMETERS
-path <string[]>
Specifies a path to be tested. Wildcards are permitted. If the path
includes spaces, enclose it in quotation marks. The parameter n
ame ("-Path") is optional.

Required? true
...



-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com

> Is it intensional? I think it is. Here's what the help says (it'sPerhaps you are talking about something else. Empty string or null
parameters are not the same as omitted parameters.

$Path = ''
Test-Path -Path $Path -IsValid

Output:
Test-Path : Cannot bind argument to parameter 'Path' because it is an empty
string.
....

Note, I do provide parameter -Path, so that 'required' is satisfied. But I
rather expect

Output:
False

than a failure message in this case.

--
Thanks,
Roman Kuzmin
PowerShellFar and FarNET: http://code.google.com/p/farnet/

I can see what you mean.

-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com