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Suppose having SampleDocument and SampleDto. Each type has some fields that other does not have.

And you want to convert one type to other.

First, add dependency:

"AutoMapper": "5.1.1"

Here is what you should do in Startup:

// Before App.UseMvc();

AutoMapper.Mapper.Initialize(cfg => {
  cfg.CreateMap<SampleDocument, SampleDto>();
}

Source object: SampleDocument, Target object: SampleDto

Automapper ignores the fields that SampleDocument has SampleDto does not have. Automapper also ignores the NullReferenceExceptions, You can define your mapping strategy if you need.

Use it as:

Mapper.Map<SampleDto>(sampleDocumentInstance);

//other example
Mapper.Map<IEnumerable<SampleDto>>(sampleDocumentListInstance);