C# SubDomain Parsing

parse.cs

void Main()
{
    var testCases = new[] {
        null,
        "",
        "localhost",
        "johnnycode.com",
        "blog.johnnycode.com",
        "a.b.c.blog.johnnycode.com"
    };

    foreach (var testCase in testCases)
    {
        var subDomains = GetSubDomains(testCase);

        Console.WriteLine("Test Case: " + testCase);
        
        if (subDomains != null && subDomains.Length > 0)
            Console.WriteLine("Results: " + string.Join(",", subDomains));
        else
            Console.WriteLine("None");

        Console.WriteLine();
    }
}

public string[] GetSubDomains(string host)
{
    if (string.IsNullOrWhiteSpace(host))
        return null;

    var parts = host.Split('.');

    if (parts.Length > 2)
        return parts.Take(parts.Length - 2).ToArray();
    else if (parts.Length == 2)
        return new string[0];
    else if (parts.Length == 1)
        return new string[0];

    return parts;
}

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