Vista - tee-object bug

[xml]$a = "<hello>there</hello>"
$a | tee-object -variable test

gives

Exception retrieving string: "Cannot find an overload for "XmlNode" and
the argument count: "3"."

... anybody dare to suggest the cause of this bug. Maybe a side effect of
the powershell adapter. and an assumption tee-object makes?

-Karl

Shouldn't you add a reference to $test or I'm missing something?

PS > $test=""
PS > [xml]$a = "<hello>there</hello>"
PS > $a | tee-object -variable [ref]test

hello
-----
there


The help for tee-object:

-variable <string>
Assigns a reference to the input objects to the specified variable.



-----
Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com
Hebrew weblog: http://blogs.microsoft.co.il/blogs/scriptfanatic

At first glance it would appear to me that Tee-Object is trying to copy the
XmlDocument by creating a new XmlNode. However, that would be impossible as
XmlNode is abstract. It would be more rational to try to create a new
XmlDocument.

After throwing the exception into my errordialog script I see that it is
actually trying to dynamically invoke a method.
A fast search in .NET Reflector found a static "XmlNode" method.

Microsoft.PowerShell.ToStringCodeMethods.XmlNode(PSObject) as String
within System.Management.Automation.dll

There were no other overloads visible.

Looking at the stack trace I see it being called by
PSObject.ToString(String, IFormatProvider).

$a.ToString($null, $null) will give the same error.

It seems to be that PSObject.ToString(String, IFormatProvider) can not
process correctly when it is overridden by the XmlNode code method.

PSObject.ToString is being called by the Set-Variable cmdlet so I don't see
any easy way around this bug.

"Karl Prosser[MVP]" <karl@xxxxxx_o_w_e_r_s_h_e_l_l.com> wrote in message
news:%23BmlLChQIHA.4584@xxxxxx

The problem occurs when value is piped to sv or pass to sv by tee.

# no problem
rv test -ea 0
sv test ([Xml]"<hello>there</hello>")
$test

# problen when assigned by piped value
rv test -ea 0
[Xml]"<hello>there</hello>" | sv test
$test

rv test -ea 0
[Xml]"<hello>there</hello>" | % {sv test ($_)}
$test

# problem because tee calls sv
rv test -ea 0
tee -va test -input ([Xml]"<hello>there</hello>")
$test

rv test -ea 0
[Xml]"<hello>there</hello>" | tee -va test
$test

---
somebody

On Dec 19, 2:57 am, Shay Levi <n...@xxxxxx> wrote:Hey Shay,

just an FYI: using [ref] in this way doesn't work - that particular
parameter takes a string. I think the reason it appears to work is
because tee-object is silently ignoring the invalid variable name.
replacing [ref] with any other text in square brackets has the same
effect.

- Oisin / x0n