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How do I detect whether the machine is joined to an Active Directory domain (versus in Workgroup mode)?
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You can quickly check whether your computer is part of a domain or not. Open the Control Panel, click the System and Security category, and click System. Look under “Computer name, domain and workgroup settings” here. If you see “Domain”: followed by the name of a domain, your computer is joined to a domain.
Concluding. Using the DomainRole property of the ComputerSystem class is a useful and fast way to check whether a Server Core installation of Windows Server is a Domain Controller, whether it's domain-joined and whether it holds the PDCe FSMO role.
domainname command in Linux is used to return the Network Information System (NIS) domain name of the host. You can use hostname -d command as well to get the host domainname. If the domain name is not set up in your host then the response will be “none”.
Don't fool with pinvoke if you don't have to.
Reference System.DirectoryServices, then call:
System.DirectoryServices.ActiveDirectory.Domain.GetComputerDomain() Throws an ActiveDirectoryObjectNotFoundException if the machine is not domain-joined. The Domain object that's returned contains the Name property you're looking for.
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