Karol Kolenda Karol Kolenda - 1 year ago 71
C# Question

Faster deep cloning

Does anyone want a framework/class which allows me to clone by values .Net objects? I'm only interested with public read/write properties (namely DataContracts), and I don't care if references are resolved correctly (i.e. collecions which contains the same instance of item twice).

I tried serialization trick via

DataContractSerializer
(serialize to XML and back), wrote reflection-based cloning class (sometimes faster/sometimes slower), and was wondering if someone wrote a helper class which can do this via Emit and not reflection. As for now emitting IL is a little to much for my little brain, but I guess this would be the ultimate solution. Unless someone knows an alternative method which is faster than DataContractSerializer.

Many thanks,
Karol

Answer Source

If you are talking about an object tree/graph:

Writing specific IL to serialize an object is tricky. IMO, your best bet is to look at a full serialization, like how DataContractSerializer would work - but not necessarily with that engine.

For example, protobuf-net has a Serializer.DeepClone<T> method that might help. It should be faster than DataContractSerializer, at least. At the current time, you need to add some clues for the serializer (even if just [ProtoContract(ImplicitFields=ImplicitFields.AllPublic)]) - however, the current (incomplete) work-in-progress offers POCO support without attributes.


If you are talking about individual objects:

There are fairly simple things you can do here with Expression in .NET 3.5; build a dynamic Expression based on reflection, and call .Compile(). MiscUtil has this already:

DestType clone = PropertyCopy<DestType>.CopyFrom(original);

With .NET 2.0/3.0 (without Expression) you might consider HyperDescriptor for similar purposes.