Iterate over PSObject properties in PowerShell

Question

I have this PSObject (from XML):

bool : {IsActive, ShowOnB2C, ShowOnB2B, IsWebNews}
str  : {id, ProductId, GroupName, Unit...}
int  : {ProductIdNumeric, Prices_SalesOne, Prices_Treater, Prices_B2C...}
arr  : {EnvironmentBrands, Catalogs, NavisionLevels}
long : long

I would like to iterate over the properties without using the property names, for instance bool.

I have tried to index into the object like this:

$document[0]

But that gives me nothing, but it does not cause any errors either.

Select-Object kind of works, but then I have to use the property names, and I don't want that.

$documents | Select-Object bool,str

ForEach do not iterate the properties.

$documents | ForEach {
    $_.name
}

returns doc and that is the name of the tag (XML) holding the bools, ints, and strings.

Answer 1

This is possible using the hidden property PSObject:

$documents.PSObject.Properties | ForEach-Object {
    $_.Name
    $_.Value
}

This won't work with certain PowerShell-created objects (PSObjects) that contain "NoteProperties" (properties of type NoteProperty).

See this answer for a method that covers all property types.

Answer 2

I prefer using foreach to loop through PowerShell objects:

foreach($object_properties in $obj.PsObject.Properties)
{
    # Access the name of the property
    $object_properties.Name

    # Access the value of the property
    $object_properties.Value
}

Generally, foreach has higher performance than Foreach-Object.

And yes, foreach is actually different than Foreach-Object under the hood.

Answer 3

You might need NoteProperty too with Get-Member.

$documents | Get-Member -membertype property,noteproperty | 
  Foreach name

EDIT: type "properties" seems a more generic catchall

$documents | get-member -type properties | % name

EDIT: dump out all the values:

$obj = ls test.ps1
$obj | Get-Member -Type properties | foreach name | 
  foreach { $_ + ' = ' + $obj.$_ }

Attributes = Normal
CreationTime = 06/01/2019 11:29:03
CreationTimeUtc = 06/01/2019 15:29:03
Directory = /Users/js
DirectoryName = /Users/js
Exists = True
Extension = .ps1
FullName = /Users/js/test.ps1
IsReadOnly = False
LastAccessTime = 06/05/2019 23:19:01
LastAccessTimeUtc = 06/06/2019 03:19:01
LastWriteTime = 06/01/2019 11:29:03
LastWriteTimeUtc = 06/01/2019 15:29:03
Length = 55
Name = test.ps1

An alternative way without "| foreach name", that needs extra parentheses:

$obj | Get-Member -Type properties | 
  foreach { $_.name + ' = ' + $obj.($_.name) }

Another take which results in an array that's easier to work with, and might be good for objects converted from json:

$a = '{ prop1:1, prop2:2, prop3:3 }' | convertfrom-json     
$a

prop1 prop2 prop3
----- ----- -----
    1     2     3

$a.PSObject.Properties | select name,value

name  value
----  -----
prop1     1
prop2     2
prop3     3