How to determine if the "Active Directory Domain Services" role has been installed on a server

Question

I am trying to figure out if the Active Directory Domain Services are installed a windows server.

I know they show up in the Server Manager, but can I programmatically get if the role is installed on a server using C# code

Answer 1

If you know the name of the server you want to test and can run the program with domain admin privileges remotely, you can use WMI:

internal static bool IsDomainController(string ServerName)
{
    StringBuilder Results = new StringBuilder();

    try
    {
        ManagementObjectSearcher searcher =
            new ManagementObjectSearcher("\\\\" + ServerName + "\\root\\CIMV2",
            "SELECT * FROM Win32_ServerFeature WHERE ID = 10");

        foreach (ManagementObject queryObj in searcher.Get())
        {
            Results.AppendLine(queryObj.GetPropertyValue("ID").ToString());
        }
    }
    catch (ManagementException)
    {
        //handle exception
    }

    if (Results.Length > 0)
        return true;
    else
        return false;
}

If you're running that locally on the server, the WMI path changes to:

        ManagementObjectSearcher searcher =
            new ManagementObjectSearcher("root\\CIMV2",
            "SELECT * FROM Win32_ServerFeature WHERE ID = 10");

See the MSDN reference on Win32_ServerFeature for a full list of roles and their ID numbers.