Serialize .NET struct types and custom serializers

[Sign Theta]

Hi Guys,

I am new to MongoDB and have been going through the C# driver doc and am a little lost as to how to implement custom serializers. Could anyone help me on this please?

It all started when I tried to store an object that contained System.Drawing.Color as one of its properties and it turns out, because Color is a struct and structs are value type and therefore it has to be custom handled for MongoDB.

i have trawled the web for info and could not find that works for me. one site that suggested a method here but it did not work for me as it was throwing exception "ReadBsonType can only be called when State is Type, not when State is Value"

I modified the code linked above as follows but now at fieldInfo.SetValue(result, value); it says no set method found. i understand what is happening but not sure WHY it is though.

could any one help or at least suggest an alternative solution>

thanks in advance!

public override T Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
                {
                        var reader = context.Reader;
                        var nt = args.NominalType;
                        var result = (object)(new T());    //Activator.CreateInstance(nt));

                        reader.ReadStartDocument();
                        while (reader.State != BsonReaderState.EndOfDocument)
                        {
                                var state = context.Reader.State;

                                Debug.WriteLine($"State: {state}");

                                switch (state)
                                {
                                        case BsonReaderState.Name:
                                                var name = reader.ReadName(new Utf8NameDecoder());
                                                Debug.WriteLine(name);
                                                var fieldInfo = nt.GetField(name);
                                                object value = null;

                                                if (fieldInfo != null)
                                                {
                                                        value = BsonSerializer.Deserialize(reader, fieldInfo.FieldType);
                                                        fieldInfo.SetValue(result, value);
                                                        Debug.WriteLine($"Name: {name}, Value: {value}");
                                                }
                                                else
                                                {
                                                        var propertyInfo = nt.GetProperty(name);

                                                        if (propertyInfo != null)
                                                        {
                                                                value = BsonSerializer.Deserialize(reader, propertyInfo.PropertyType);

                                                                if (!propertyInfo.CanWrite) break;
                                                                propertyInfo.SetValue(result, value, null);
                               
                                                                Debug.WriteLine($"Name: {name}, Value: {value}");
                                                        }
                                                }
                                                break;

                                        case BsonReaderState.Type:
                                                var type = reader.ReadBsonType();
                                                Debug.WriteLine(type);
                                                break;

                                        case BsonReaderState.Value:
                                                reader.SkipValue();
                                                break;
                                }
                        }

            reader.ReadEndDocument();

                        Debug.WriteLine("============================");

                        return (T) result;
                }

[Sign Theta]

OK, Just checked the doco and it seems that the A,R,G,B props are computed params so it makes sense as to why the set method is not found...

... but i still need regarding serializing value types.