using System;

using AutoMapper;

public class Program

{

    public static void Main()

    {

        var mapper = new MapperConfiguration(cfg => cfg.AddProfile<TestProfile>())

            .CreateMapper();

        var source = new Source

        {

            Rate = "0.0123"

        };

        var target = mapper.Map<Target>(source);

​

        Console.WriteLine("Expected Value: 1.23");

        Console.WriteLine(target.Rate);

    }

}

​

public class Source

{

    public string Rate { get; set; }

}

​

public class Target

{

    public decimal Rate { get; set; }

}

​

public class TestProfile : Profile

{

    public TestProfile()

    {

        CreateMap<Source, Target>()

            .ForMember(dest => dest.Rate, opts =>

            {

                opts.MapFrom(src => src.Rate);

                opts.AddTransform(x => Math.Round(x * 100M, 2));

            });

    }

}