How to get an object's property's value by property name?
Sure
write-host ($obj | Select -ExpandProperty "SomeProp")
Or for that matter:
$obj."SomeProp"
Expanding upon @aquinas:
Get-something | select -ExpandProperty PropertyName
or
Get-something | select -expand PropertyName
or
Get-something | select -exp PropertyName
I made these suggestions for those that might just be looking for a single-line command to obtain some piece of information and wanted to include a real-world example.
In managing Office 365 via PowerShell, here was an example I used to obtain all of the users/groups that had been added to the "BookInPolicy" list:
Get-CalendarProcessing [email protected] | Select -expand BookInPolicy
Just using "Select BookInPolicy" was cutting off several members, so thank you for this information!
You can get a property by name using the Select-Object cmdlet and specifying the property name(s) that you're interested in. Note that this doesn't simply return the raw value for that property; instead you get something that still behaves like an object.
[PS]> $property = (Get-Process)[0] | Select-Object -Property Name
[PS]> $property
Name
----
armsvc
[PS]> $property.GetType().FullName
System.Management.Automation.PSCustomObject
In order to use the value for that property, you will still need to identify which property you are after, even if there is only one property:
[PS]> $property.Name
armsvc
[PS]> $property -eq "armsvc"
False
[PS]> $property.Name -eq "armsvc"
True
[PS]> $property.Name.GetType().FullName
System.String
As per other answers here, if you want to use a single property within a string, you need to evaluate the expression (put brackets around it) and prefix with a dollar sign ($) to declare the expression dynamically as a variable to be inserted into the string:
[PS]> "The first process in the list is: $($property.Name)"
The first process in the list is: armsvc
Quite correctly, others have answered this question by recommending the -ExpandProperty parameter for the Select-Object cmdlet. This bypasses some of the headache by returning the value of the property specified, but you will want to use different approaches in different scenarios.
-ExpandProperty <String>Specifies a property to select, and indicates that an attempt should be made to expand that property
https://technet.microsoft.com/en-us/library/hh849895.aspx
[PS]> (Get-Process)[0] | Select-Object -ExpandProperty Name
armsvc