Hex conversion of GUID removes Zeros? - powershell

Question

I have a script that takes the hex value of a GUID and converts to a GUID. However it is removing zeros for eg. this is my output. And the reg reads for the hex values.
$GUIDLocal1 = (Get-ItemProperty "$Reg\Common Api")."UniqueID"
$GUIDLocal2 = (Get-ItemProperty "$Reg\Test\Common Api")."UniqueID"
# This is not code below just info
$GUIDLocal1 is 54 171 225 63 61 204 14 79 168 61 49 246 193 140 121 152
$GUIdlocal2 is 54 171 225 63 61 204 14 79 168 61 49 246 193 140 121 152
ID in Database is 36ABE13F3DCC0E4FA83D31F6C18C7998
$guidinhex 36ABE13F3DCCE4FA83D31F6C18C7998
$guidinhex2 36ABE13F3DCCE4FA83D31F6C18C7998
# This is not code above just info
I am using this code for the conversion
$guidinHex = [string]::Empty
$guidinHex2 = [string]::Empty
$GUIDLocal1 | % { $guidInHEX += '{0:X}' -f [int]$_ }
$GUIDLocal2 | % { $guidInHEX2 += '{0:X}' -f [int]$_ }
ID is GUID with all {, }, and - removed for ease of view.
$GUIDLocal1 and $GUIDLocal2 is the hex value in registry.
I then use the code above to convert ($GUIDLocal1 and $GUIDLocal2 is the values guidinhex / 2).
The conversion works, but if there is a zero it strips it out as you can see above - this machine the GUID actually matches the reg values but my conversion is skewing the result I just need to know why and how not to have the conversion remove the Zero / s.
I thought adding [int] would help but to no avail.

Answer 1

The -f (format) operator lets you format a numeric value as a hexadecimal string with leading zeros. The format specification is {0:Xn} or {0:xn}, where n is the number of digits desired in the string output (padded with zeros if needed). Uppercase X or lowercase x specifies whether you want the hex values A through F to be uppercase or lowercase. Examples:
"{0:X2}" -f 15 # outputs string 0F
"{0:X3}" -f 27 # outputs string 01B
"{0:x4}" -f 254 # outputs string 00fe
...and so forth. Documentation here:
https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#XFormatString