A small and simple PowerShell function to convert enum types to a dictionary with enum numeric values as dictionary keys mapped to corresponding enum string names.

Get-EnumValuesTable.ps1

<#
.SYNOPSIS
    A small and simple PowerShell function to convert enum types to a dictionary with enum numeric values as dictionary keys mapped to corresponding enum string names.
.DESCRIPTION
    A small and simple PowerShell function to convert enum types to a dictionary with enum numeric values as dictionary keys mapped to corresponding enum string names.
.PARAMETER Type
    Specifies the type as a [System.Type] object, or as a string containing the typename. Note that the function may throw an exception, if it fails to resolve a type by its short type name.
.EXAMPLE
    PS C:\> Get-EnumValuesTable -Type "System.Security.AccessControl.AccessControlType"
    The function returns a sorted dictionary:
    @{
        0   =   "Allow" ;
        1   =   "Deny"
    }
.EXAMPLE
    PS C:\> Get-EnumValuesTable -Type ((Get-Acl -Path .).Access[0].InheritanceFlags.GetType())
    The function returns a sorted dictionary with keys and values of the enum type [System.Security.AccessControl.InheritanceFlags]:
    @{
        0   =   "None"              ;
        1   =   "ContainerInherit"  ;
        2   =   "ObjectInherit"
    }
.EXAMPLE
    PS C:\> Get-EnumValuesTable -Type ((Get-Acl -Path .).Access[0].InheritanceFlags.GetType().FullName)
    Note that in this case the function takes a string typename as an argument.
    The function returns a sorted dictionary with keys and values of the enum type [System.Security.AccessControl.InheritanceFlags]:
    @{
        0   =   "None"              ;
        1   =   "ContainerInherit"  ;
        2   =   "ObjectInherit"
    }
.EXAMPLE
    PS C:\> [System.DirectoryServices.ActiveDirectory.ActiveDirectorySchema]::GetCurrentSchema().FindProperty('Description').Syntax.GetType() | Get-EnumValuesTable
    The function returns a sorted dictionary with keys and values of the enum type [System.DirectoryServices.ActiveDirectory.ActiveDirectorySyntax]:
    @{
        0   =   "CaseExactString"       ;
        1   =   "CaseIgnoreString"      ;
        2   =   "NumericString"         ;
        3   =   "DirectoryString"       ;
        4   =   "OctetString"           ;
        5   =   "SecurityDescriptor"    ;
        6   =   "Int"                   ;
        7   =   "Int64"                 ;
        8   =   "Bool"                  ;
        9   =   "Oid"                   ;
        10  =   "GeneralizedTime"       ;
        11  =   "UtcTime"               ;
        12  =   "DN"                    ;
        13  =   "DNWithBinary"          ;
        14  =   "DNWithString"          ;
        15  =   "Enumeration"           ;
        16  =   "IA5String"             ;
        17  =   "PrintableString"       ;
        18  =   "Sid"                   ;
        19  =   "AccessPointDN"         ;
        20  =   "ORName"                ;
        21  =   "PresentationAddress"   ;
        22  =   "ReplicaLink"
    }
.INPUTS
    [System.Type]
.OUTPUTS
    [System.Collections.Generic.SortedDictionary[uint64,string]]
.NOTES
    A small and simple PowerShell function to convert enum types to a dictionary with enum numeric values as dictionary keys mapped to corresponding enum string names.
    If the specified type is not an enum type, the function returns nothing.
    You may specify the type as a [System.Type] object or as a string containing the type name.
    But the function may throw an exception, if it fails to resolve a type by its short type name.
    This help seems to be much longer than the function code :P
.LINK
    .
#>

function Get-EnumValuesTable {
    [CmdletBinding()]
    [OutputType([System.Collections.Generic.SortedDictionary[uint64,string]])]
    param   (
        #   Specifies a type
        [Parameter(
            Mandatory           =   $true,
            ValueFromPipeline   =   $true
        )]
        [type]
        $Type
    )
    begin   {}
    process {
        if  (-not   $Type.IsEnum)   {
            return
        }
        [string[]]$enumNames    =   [System.Enum]::GetNames($Type)
        [System.Collections.Generic.SortedDictionary[uint64,string]]$outputObject   =   [System.Collections.Generic.SortedDictionary[uint64,string]]::new()
        foreach ($enumName  in  $enumNames) {
            [uint64]$enumValue  =   $Type::$enumName.value__
            $outputObject.Add($enumValue,$enumName)
        }
        return  $outputObject
    }
    end     {}
}