This gist just explains values of IFormatProvider argument of the ToString() method of the .NET type System.Guid. See more: https://learn.microsoft.com/ru-ru/dotnet/api/system.guid.tostring

Format-Guid.ps1

#   This gist just explains values of IFormatProvider argument of the ToString() method of the .NET type System.Guid
#   See more:   https://learn.microsoft.com/ru-ru/dotnet/api/system.guid.tostring

enum PSGuidFormatProvider {
    None        =   0   #   Only alphanumeric characters: 00000000000000000000000000000000
    Braces      =   1   #   Figure brackets, "{}": {00000000-0000-0000-0000-000000000000}
    Dashes      =   2   #   Hyphens, "-": 00000000-0000-0000-0000-000000000000
    Parentheses =   3   #   Round brackets, "()": (00000000-0000-0000-0000-000000000000)
    Xadecimal   =   4   #   Groups of heXadecimal values: {0x00000000,0x0000,0x0000,{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}}
}

enum PSGuidCase {
    Lower   =   0
    Upper   =   1
}

function Format-Guid {
    [CmdletBinding()]
    param   (
        [Parameter(ValueFromPipeline)]
        [guid]
        $Guid   =   [guid]::NewGuid(),
        [Parameter()]
        [PSGuidFormatProvider]
        $Format =   [PSGuidFormatProvider]::Dashes,
        [Parameter()]
        [PSGuidCase]
        $Case   =   [PSGuidCase]::Lower
    )
    begin   {
        [string]$formatProvider =   $Format.ToString().Substring(0,1)
    }
    process {
        if  ($Case  -ne [PSGuidCase]::Upper)    {
            return  $Guid.ToString($formatProvider)
        }
        return  $Guid.ToString($formatProvider).ToUpperInvariant()
    }
    end     {}
}

Format-Guid