Pass Objects to AutoMapper Mapping

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AutoMapper handles this key-value pair scenario out of the box.

Mapper.CreateMap<Source, Dest>()
    .ForMember(d => d.Foo, opt => opt.ResolveUsing(res => res.Context.Options.Items["Foo"]));

Then at runtime:

Mapper.Map<Source, Dest>(src, opt => opt.Items["Foo"] = "Bar");

A bit verbose to dig into the context items but there you go.

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