public ImmutableMessage(Type mappedType, object content, ImmutableAttribute[] attributes, int index)
{
MappedType = mappedType;
Index = index;
Content = content;
_attributes = attributes;
}
public ImmutableEnvelope(string envelopeId, ImmutableAttribute[] attributes, ImmutableMessage[] items,
DateTime deliverOnUtc, DateTime createdOnUtc)
{
EnvelopeId = envelopeId;
DeliverOnUtc = deliverOnUtc;
_attributes = attributes;
Items = items;
CreatedOnUtc = createdOnUtc;
}