-IgnoreComments do not work about psini HOT 1 OPEN

You need to remove the parentheses ().
Get-IniContent -FilePath "C:\temp\abc.ini" -IgnoreComments

If a switch is present on the command it's $true, If it's not, it's $false. It is possible to set the value explicitly:
Get-IniContent -FilePath "C:\temp\abc.ini" -IgnoreComments:$true
or you can do it with a variable:

[bool]$commentYN=$false
Get-IniContent -FilePath "C:\temp\abc.ini" -IgnoreComments:$commentYN

For future questions: it would be helpful if you also include the error you get or the output from the command.

from psini.