Public/Get-ADSIDomainMode.ps1

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Function Get-ADSIDomainMode
{
<#
.SYNOPSIS
 Function to retrieve Domain mode
 
.DESCRIPTION
 Function to retrieve Domain mode
 
.PARAMETER Credential
 Specifies alternative credential
 
.PARAMETER DomainName
 Specifies the Domain Name where the function should look
 
.EXAMPLE
 Get-ADSIDomainMode
 
.EXAMPLE
 Get-ADSIDomainMode -Credential (Get-Credential)
 
.EXAMPLE
 Get-ADSIDomainMode -DomainName "FXTEST.local"
 
.NOTES
 Francois-Xavier Cat
 lazywinadmin.com
 @lazywinadm
 github.com/lazywinadmin
#>

    [cmdletbinding()]
    PARAM (
        [Alias("RunAs")]
        [System.Management.Automation.PSCredential]
        [System.Management.Automation.Credential()]
        $Credential = [System.Management.Automation.PSCredential]::Empty,
        
        $DomainName = [System.DirectoryServices.ActiveDirectory.Domain]::Getcurrentdomain()
    )
    PROCESS
    {
        TRY
        {
            IF ($PSBoundParameters['Credential'] -or $PSBoundParameters['DomainName'])
            {
                Write-Verbose '[PROCESS] Credential or DomainName specified'
                $Splatting = @{ }
                IF ($PSBoundParameters['Credential']) { $Splatting.Credential = $Credential }
                IF ($PSBoundParameters['DomainName']) { $Splatting.DomainName = $DomainName }
                
                (Get-ADSIDomain @splatting).DomainMode
                
            }
            ELSE
            {
                (Get-ADSIDomain).DomainMode
            }
            
        }
        CATCH
        {
            Write-Warning -Message '[PROCESS] Something wrong happened!'
            Write-Warning -Message $error[0].Exception.Message
        }
    }
}