Public/Get-ADSIDomainController.ps1

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

    
    [CmdletBinding()]
    [OutputType('System.DirectoryServices.ActiveDirectory.DomainController')]
    param
    (
        [Alias("RunAs")]
        [System.Management.Automation.PSCredential]
        [System.Management.Automation.Credential()]
        $Credential = [System.Management.Automation.PSCredential]::Empty,
    
        $DomainName = [System.DirectoryServices.ActiveDirectory.Domain]::Getcurrentdomain()
    )
    
    BEGIN
    {
        
        
        IF ($PSBoundParameters['Credential'])
        {
            $Context = New-ADSIDirectoryContext -Credential $Credential -contextType Domain
            if ($PSBoundParameters['DomainName'])
            {
                $Context = New-ADSIDirectoryContext -Credential $Credential -contextType Domain -DomainName $DomainName
            }
        }
        ELSE
        {
            $Context = New-ADSIDirectoryContext -contextType Domain
            if ($PSBoundParameters['DomainName'])
            {
                $Context = New-ADSIDirectoryContext -contextType Domain -DomainName $DomainName
            }
        }
    }
    PROCESS
    {
        [System.DirectoryServices.ActiveDirectory.DomainController]::FindAll($Context)
    }
}