Enumeration is the action of mentioning a number of things one by one, often to count them or describe them but it has specific meanings in computer science, data types like enum for named constants.
In the PowerShell to list the enumeration information for a parameter, you will need to use elementory .NET Framework type of the parameter and then use the [System.Enum]::GetNames() static method. In the step one you need to fist identify the Parameter type to retrieve the Parameter Type. In the below example I will use Get-Command cmdlet and use common parameter ErrorAction to know the all the enum values. As it can be seen its BaseType is System.Enum.
(Get-Command -Name Get-Service).Parameters.ErrorAction.ParameterType IsPublic IsSerial Name BaseType -------- -------- ---- -------- True True ActionPreference System.Enum
(Get-Command -Name Get-Service).Parameters.ErrorAction.ParameterType.FullName
Once I have the type name to list the Enumeration values, I can cast it to a type object and use the static method .GetNames() to list all available labels.
$enumType = [System.Management.Automation.ActionPreference]
[System.Enum]::GetNames($enumType)
SilentlyContinue
Stop
Continue
Inquire
Ignore
Suspend
Break
Here is the advanced information to list names and integer values, In general enumeration names are internally represented by integer values by default starting at 0. To see both the name and its corresponding integer value, you can loop through the results
$enumType = [System.Management.Automation.ActionPreference]
[System.Enum]::GetNames($enumType) | ForEach-Object {
$name = $_
$value = [int]([System.Enum]::Parse($enumType, $name))
[PSCustomObject]@{
Name = $name
Value = $value
}
}
Name Value
---- -----
SilentlyContinue 0
Stop 1
Continue 2
Inquire 3
Suspend 4
Ignore 5
This method is useful for any parameter that uses a defined enumeration, such as the -ExecutionPolicy parameter of Set-ExecutionPolicy or the -MemberType of Get-Member. Below is 2 more simpler methods to get information about enumerations with one liner commands.
[Microsoft.PowerShell.Execution].GetEnumNames()
(Get-Command Set-ExecutionPolicy).Parameters['ExecutionPolicy'].ParameterType.GetEnumNames()
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