MongoDB.Bson.Serialization.Serializers.BitmapSerializer.Serialize C# (CSharp) Метод

        public override void Serialize(
            BsonWriter bsonWriter,
            Type nominalType,
            object value,
            IBsonSerializationOptions options)
        {
            if (nominalType != typeof(Image) && nominalType != typeof(Bitmap))
            {
                var message = string.Format("Nominal type must be Image or Bitmap, not {0}.", nominalType.FullName);
                throw new ArgumentException(message, "nominalType");
            }

            if (value == null)
            {
                bsonWriter.WriteNull();
            }
            else
            {
                var actualType = value.GetType();
                if (actualType != typeof(Bitmap))
                {
                    var message = string.Format("Actual type must be Bitmap, not {0}.", actualType.FullName);
                    throw new ArgumentException(message, "actualType");
                }

                var bitmap = (Bitmap)value;
                var stream = new MemoryStream();
                bitmap.Save(stream, ImageFormat.Bmp);
                var bytes = stream.ToArray();

                if (nominalType == typeof(Image))
                {
                    bsonWriter.WriteStartDocument();
                    bsonWriter.WriteString("_t", "Bitmap");
                    bsonWriter.WriteBytes("bitmap", bytes);
                    bsonWriter.WriteEndDocument();
                }
                else
                {
                    bsonWriter.WriteBytes(bytes);
                }
            }
        }
    }