FMessage.GetMessage_WA_Type_StrValue C# (CSharp) Method

    public static string GetMessage_WA_Type_StrValue(Type type)
    {
        if (type != Type.Undefined)
        {
            if (type == Type.System)
            {
                return "system";
            }
            if (type == Type.Image)
            {
                return "image";
            }
            if (type == Type.Audio)
            {
                return "audio";
            }
            if (type == Type.Video)
            {
                return "video";
            }
            if (type == Type.Contact)
            {
                return "vcard";
            }
            if (type == Type.Location)
            {
                return "location";
            }
        }
        return null;
    }

        protected void SendMessageWithMedia(FMessage message)
        {
            ProtocolTreeNode node;

            if (FMessage.Type.System == message.media_wa_type)
            {
                throw new SystemException("Cannot send system message over the network");
            }

            List <KeyValue> list = new List <KeyValue>(new KeyValue[] { new KeyValue("xmlns", "urn:xmpp:whatsapp:mms"), new KeyValue("type", FMessage.GetMessage_WA_Type_StrValue(message.media_wa_type)) });

            if (FMessage.Type.Location == message.media_wa_type)
            {
                list.AddRange(new KeyValue[] { new KeyValue("latitude", message.latitude.ToString(CultureInfo.InvariantCulture)), new KeyValue("longitude", message.longitude.ToString(CultureInfo.InvariantCulture)) });
                if (message.location_details != null)
                {
                    list.Add(new KeyValue("name", message.location_details));
                }
                if (message.location_url != null)
                {
                    list.Add(new KeyValue("url", message.location_url));
                }
            }
            else if (((FMessage.Type.Contact != message.media_wa_type) && (message.media_name != null)) && ((message.media_url != null) && (message.media_size > 0L)))
            {
                list.AddRange(new KeyValue[] { new KeyValue("file", message.media_name), new KeyValue("size", message.media_size.ToString(CultureInfo.InvariantCulture)), new KeyValue("url", message.media_url) });
                if (message.media_duration_seconds > 0)
                {
                    list.Add(new KeyValue("seconds", message.media_duration_seconds.ToString(CultureInfo.InvariantCulture)));
                }
            }
            if ((FMessage.Type.Contact == message.media_wa_type) && (message.media_name != null))
            {
                node = new ProtocolTreeNode("media", list.ToArray(), new ProtocolTreeNode("vcard", new KeyValue[] { new KeyValue("name", message.media_name) }, WhatsApp.SYSEncoding.GetBytes(message.data)));
            }
            else
            {
                byte[] data = message.binary_data;
                if ((data == null) && !string.IsNullOrEmpty(message.data))
                {
                    try
                    {
                        data = Convert.FromBase64String(message.data);
                    }
                    catch (Exception)
                    {
                    }
                }
                if (data != null)
                {
                    list.Add(new KeyValue("encoding", "raw"));
                }
                node = new ProtocolTreeNode("media", list.ToArray(), null, data);
            }
            this.SendNode(GetMessageNode(message, node));
        }