Validate the License Logic

ValidateLicense.cs

private static void ValidateLicense(string publicKeyPath, string licensePath)
{
    var publicKey = new PublicCryptoKey { Contents = File.ReadAllText(publicKeyPath) };
    var clientLicense = ClientLicense.Create(File.ReadAllText(licensePath));

    var violations = new List<string>();

    try
    {
        var licenseValidationRules = new List<ILicenseValidationRule>
        {
            new LicenseHasNotExpiredRule(), 
            new ValidNumberOfCoresLicenseRule()
        };

        new LicenseValidator().Validate(clientLicense, publicKey, licenseValidationRules);
    }
    catch (InvalidLicenseException exception)
    {
        violations.Add(exception.Message);
    }
    catch (AggregateException ex)
    {
        var innerExceptions = ex.InnerExceptions;

        foreach (var exception in innerExceptions)
        {
            if (exception is LicenseViolationException)
            {
                violations.Add(exception.Message);
            }
        }
        
        // If you've got to this point and there are no violations,
        // something very undesirable is happening, so bubble it up.
        if (!violations.Any())
        {
            throw;
        }
    }
    catch (Exception)
    {
        violations.Add(Messages.UnknownLicenseError);
    }

    if (violations.Any())
    {
        Console.WriteLine(Messages.LicenseViolationsEncountered);
        
        foreach (var violation in violations)
        {
            Console.WriteLine(" - " + violation);
        }

        Console.WriteLine(Messages.PressAnyKey);
        Console.ReadKey();

        Environment.Exit(-1);
    }
}