Normally, we use AutoMapper to Map object like this:

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Mapper.Initialize(
       (cfg) =>
        {
            cfg.CreateMap<TSource, TTarget>();
        }
    );
target = Mapper.Map<TTarget>(source);

however, this will create a new instanse of TTarget, then the reference of target would be changed. The original object of target will not change in this case. The solution is as follows:

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Mapper.Map(source, target);