file IO, is this a bug in Powershell?

Question

I have the following code in Powershell

$filePath = \"C:\\my\\programming\\Powershell\\output.test.txt\"

try
{
    $wStream = new-object IO.FileStream $file         


        

Answer 1

When using the New-Object cmdlet and the target type constructor takes in parameters, you should either use the -ArgumentList parameter (of New-Object) or wrap the parameters in parenthesis - I prefer to wrap my constructors with parens:

# setup some convenience variables to keep each line shorter
$path = [System.IO.Path]::Combine($Env:TEMP,"Temp.txt")
$mode = [System.IO.FileMode]::Append
$access = [System.IO.FileAccess]::Write
$sharing = [IO.FileShare]::Read

# create the FileStream and StreamWriter objects
$fs = New-Object IO.FileStream($path, $mode, $access, $sharing)
$sw = New-Object System.IO.StreamWriter($fs)

# write something and remember to call to Dispose to clean up the resources
$sw.WriteLine("Hello, PowerShell!")
$sw.Dispose()
$fs.Dispose()

New-Object cmdlet online help: http://go.microsoft.com/fwlink/?LinkID=113355

Answer 2

Yet another way could be to enclose the enums in parens:

$wStream = new-object IO.FileStream $filePath, ([System.IO.FileMode]::Append), `
    ([IO.FileAccess]::Write), ([IO.FileShare]::Read)

Answer 3

If your goal is to write into a logfile or text file, then you could try the supported cmdlets in PowerShell to achieve this?

Get-Help Out-File -Detailed

Answer 4

Another way would be to use just the name of the value and let PowerShell cast it to the target type:

New-Object IO.FileStream $filePath ,'Append','Write','Read'