if (Intent.Extras != null)
        {
            foreach (var key in Intent.Extras.KeySet())
            {
                if (key != null)
                {
                    var value = Intent.Extras.GetString(key);
                    Log.Debug(TAG, "Key: {0} Value: {1}", key, value);
                }
            }
        }

intent.PutExtra("Key", "value");