Dictionary

static readonly Dictionary<string, DeviceType> MappedDeviceType;

static fnMapDeviceType()

{

    MappedDeviceType = new Dictionary<string, DeviceType>();

    MappedDeviceType.Add("Windows NT 6.3", DeviceType.Windows);

    MappedDeviceType.Add("Windows NT 6.3; WOW64", DeviceType.Windows);

    MappedDeviceType.Add("Windows NT 10.0", DeviceType.Windows);

    MappedDeviceType.Add("Windows NT 10.0; WOW64", DeviceType.Windows);

    MappedDeviceType.Add("CPU iPhone OS 9_3_2 like Mac OS X", DeviceType.Iphone);

}

//Mapping Method

public static DeviceType MapDeviceType(string device)

{

    DeviceType mapValue = DeviceType.Unknown;

    if (!string.IsNullOrWhiteSpace(device))

    {

        if (Enum.TryParse(device, true, out mapValue))

            return mapValue;

        if (MappedDeviceType.TryGetValue(device, out mapValue))

            return mapValue;

    }

    return mapValue;

}

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//Contain en with key

   string word = "en/my";

            var mappingA = new Dictionary<string, string>()

            {

                { "en", "en-gb" },

                { "cn", "cn-zh" },

            };

string listPerson = mappingA.Where(x => word.Contains(x.Key)).Select(y => y.Value).FirstOrDefault();