Empty object evaluates as $True??

i can't figure out going on here.  have appears (to me) empty object: 

$adsiobj = new-object system.directoryservices.directorysearcher([adsi]""

)   

$adsiobj.filter = "(&(objectcategory=person)(samaccountname=fakename))"

$adsiobj.findall()

$adsiobj.findall().count

0

$adsiobj.findall() | gm

get-member : no object has been specified get-member cmdlet.
@ line:1 char:23
+ $adsiobj.findall() |gm <<<<
    + categoryinfo          : closeerror: (:) [get-member], invalidoperationexception
    + fullyqualifiederrorid : noobjectingetmember,microsoft.powershell.commands.getmembercommand

 

but evaluates $true:  if ($adsiobj.findall()) {$true}

true

 

can enlighten me?

 

 

 

 

$adsiobj.findall() returning collection.  it's empty collection, it's still collection.

($adsiobj.findall()).gettype()

ispublic isserial name                                     basetype                  
-------- -------- ----                                     --------                  
true     false    searchresultcollection                   system.marshalbyrefobject 

when send arrray or collection  through pipeline, "unrolls" collection stream of individual objects.  since collection emtpy, nothing got sent get-member, hence error message.

to see properties of collection, have this:

get-member -inputobject $adsiobj

the collection evaluates $true, because exists.

---

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