Automapper - 它可以仅映射源对象和目标对象中的现有属性吗

Automapper是一个非常有用的库，它可以帮助我们在源对象和目标对象之间进行属性映射。它的一个主要功能是将源对象的属性值复制到目标对象中，以便我们可以方便地进行数据转换和处理。

csharp
public class Source
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string Address { get; set; }
}
public class Destination
{
    public string Name { get; set; }
    public int Age { get; set; }
}

csharp
var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap()
        .ForMember(dest => dest.Name, opt => opt.MapFrom(src => src.Name))
        .ForMember(dest => dest.Age, opt => opt.MapFrom(src => src.Age));
});
var mapper = config.CreateMapper();
var source = new Source
{
    Name = "John",
    Age = 25,
    Address = "123 Street"
};
var destination = mapper.Map(source);
Console.WriteLine($"Name: {destination.Name}");
Console.WriteLine($"Age: {destination.Age}");

Name: John
Age: 25

csharp
public class Source
{
    public int Price { get; set; }
}
public class Destination
{
    public string FormattedPrice { get; set; }
}
var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap()
        .ForMember(dest => dest.FormattedPrice, opt => opt.MapFrom(src => $"${src.Price}"));
});
var mapper = config.CreateMapper();
var source = new Source
{
    Price = 1000
};
var destination = mapper.Map(source);
Console.WriteLine($"Formatted Price: {destination.FormattedPrice}");

Formatted Price: $1000

csharp
public class Source
{
    public string Name { get; set; }
    public int Age { get; set; }
}
public class Destination
{
    public string Name { get; set; }
}
var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap()
        .ForMember(dest => dest.Name, opt => opt.Ignore());
});
var mapper = config.CreateMapper();
var source = new Source
{
    Name = "John",
    Age = 25
};
var destination = mapper.Map(source);
Console.WriteLine($"Name: {destination.Name}");

Name:

csharp
public class Source
{
    public int Age { get; set; }
}
public class Destination
{
    public string AgeGroup { get; set; }
}
var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap()
        .ForMember(dest => dest.AgeGroup, opt => opt.MapFrom(src => src.Age >= 18 ? "Adult" : "Child"));
});
var mapper = config.CreateMapper();
var source1 = new Source
{
    Age = 25
};
var destination1 = mapper.Map(source1);
Console.WriteLine($"Age Group: {destination1.AgeGroup}");
var source2 = new Source
{
    Age = 10
};
var destination2 = mapper.Map(source2);
Console.WriteLine($"Age Group: {destination2.AgeGroup}");

Age Group: Adult
Age Group: Child