InterfaceMapping.cs

namespace AutoMapper.UnitTests.InterfaceMapping;
public class InterfaceWithObjectProperty : AutoMapperSpecBase
{
    protected override MapperConfiguration CreateConfiguration() => new(cfg => cfg.CreateMap<ISourceModel, IDestModel>());
    public interface ISourceModel
    {
        object Id { get; set; }
    }
    public interface IDestModel
    {
        object Id { get; set; }
    }
    public class SourceModel : ISourceModel
    {
        public object Id { get; set; }
    }
    public class DestModel : IDestModel
    {
        public object Id { get; set; }
    }
    [Fact]
    public void Should_work() => Mapper.Map(new SourceModel { Id = 42 }, new DestModel()).Id.ShouldBe(42);
}
public class InterfaceInheritance : AutoMapperSpecBase
{
    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {
        cfg.CreateMap<Source, IProperties>()
            .IncludeBase<Source, IPropertyA>()
            .IncludeBase<Source, IPropertyB>();
        cfg.CreateMap<Source, IPropertyA>();
        cfg.CreateMap<Source, IPropertyB>();
    });
    [Fact]
    public void Should_choose_the_derived_interface()
    {
        var source = new Source
        {
            Name = "Name",
            PropertyA = "PropertyA",
            PropertyB = "PropertyB"
        };
        var destination = new Target();
        Mapper.Map(source, destination);
        destination.Name.ShouldBe(source.Name);
        destination.PropertyA.ShouldBe(source.PropertyA);
        destination.PropertyB.ShouldBe(source.PropertyB);
    }
    public class Source
    {
        public string PropertyA { get; set; }
        public string PropertyB { get; set; }
        public string Name { get; set; }
    }
    public class Target : IProperties
    {
        public string PropertyA { get; set; }
        public string PropertyB { get; set; }
        public string Name { get; set; }
    }
    public interface IProperties : IPropertyA, IPropertyB
    {
        string Name { get; set; }
    }
    public interface IPropertyA
    {
        string PropertyA { get; set; }
    }
    public interface IPropertyB
    {
        string PropertyB { get; set; }
    }
}
public class MapToInterface : NonValidatingSpecBase
{
    protected override MapperConfiguration CreateConfiguration() => new(c=>c.CreateMap<object, IEnumerable<object>>());
    [Fact]
    public void Should_throw() => new Action(()=>Mapper.Map<IEnumerable<object>>(new object())).ShouldThrow<AutoMapperMappingException>().Message.ShouldStartWith(
        "Cannot create interface System.Collections.Generic.IEnumerable`1[System.Object]");
}
public class GenericsAndInterfaces : AutoMapperSpecBase
{
    MyClass<ContainerClass> source = new MyClass<ContainerClass> { Container = new ContainerClass { MyProperty = 3 } };

    public interface IMyInterface<T>
    {
        T Container { get; set; }
    }

    public class ContainerClass
    {
        public int MyProperty { get; set; }
    }

    public class ImplementedClass : IMyInterface<ContainerClass>
    {
        public ContainerClass Container
        {
            get;
            set;
        }
    }

    public class MyClass<T>
    {
        public T Container { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg => cfg.CreateMap(typeof(MyClass<>), typeof(IMyInterface<>)).AsProxy());

    [Fact]
    public void ShouldMapToExistingObject()
    {
        var destination = new ImplementedClass();
        Mapper.Map(source, destination, typeof(MyClass<ContainerClass>), typeof(IMyInterface<ContainerClass>));
        destination.Container.MyProperty.ShouldBe(3);
    }

    [Fact]
    public void ShouldMapToNewObject()
    {
        var destination = (IMyInterface<ContainerClass>) Mapper.Map(source, typeof(MyClass<ContainerClass>), typeof(IMyInterface<ContainerClass>));
        destination.Container.MyProperty.ShouldBe(3);
    }
}

public class When_mapping_generic_interface : AutoMapperSpecBase
{
    public class Source<T> : List<T>
    {
        public String PropertyToMap { get; set; }
        public String PropertyToIgnore { get; set; } = "I am not ignored";
    }

    public class Destination : DestinationBase<String>
    {
    }

    public abstract class DestinationBase<T> : DestinationBaseBase, IDestinationBase<T>
    {
        private String m_PropertyToIgnore;

        public virtual String PropertyToMap { get; set; }

        [IgnoreMap]
        public override String PropertyToIgnore
        {
            get
            {
                return m_PropertyToIgnore ?? (m_PropertyToIgnore = "Ignore me");
            }
            set
            {
                m_PropertyToIgnore = value;
            }
        }

        public virtual List<T> Items { get; set; }
    }

    public abstract class DestinationBaseBase
    {
        [IgnoreMap]
        public virtual String PropertyToIgnore { get; set; }
    }

    public interface IDestinationBase<T>
    {
        String PropertyToMap { get; set; }
        List<T> Items { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg=>
        cfg.CreateMap(typeof(IList<>), typeof(IDestinationBase<>))
                .ForMember(nameof(IDestinationBase<Object>.Items), p_Expression => p_Expression.MapFrom(p_Source => p_Source))
                .ForMember("PropertyToMap", o=>o.Ignore())
                .AsProxy());

    [Fact]
    public void Should_work()
    {
        var source = new Source<String>{"Cat", "Dog"};
        source.PropertyToMap = "Hello World";
        var destination = Mapper.Map<IDestinationBase<string>>(source);
        destination.PropertyToMap.ShouldBeNull();
        destination.Items.ShouldBe(source);
    }
}

public class When_mapping_an_interface_with_getter_only_member : AutoMapperSpecBase
{
    interface ISource
    {
        int Id { get; set; }
    }

    public interface IDestination
    {
        int Id { get; set; }
        int ReadOnly { get; }
    }

    class Source : ISource
    {
        public int Id { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(c=>c.CreateMap<ISource, IDestination>().AsProxy());

    [Fact]
    public void ShouldMapOk()
    {
        Mapper.Map<IDestination>(new Source { Id = 5 }).Id.ShouldBe(5);
    }
}

public class When_mapping_base_interface_members
{
    public interface ISource
    {
        int Id { get; set; }
    }

    public interface ITarget : ITargetBase
    {
        int Id { get; set; }
    }

    public interface ITargetBase
    {
        int BaseId { get; set; }
    }

    [Fact]
    public void Should_find_inherited_members_by_name()
    {
        new MapperConfiguration(c=>c.CreateMap<ISource, ITarget>().ForMember("BaseId", opt => opt.Ignore()));
    }
}

public class When_mapping_to_existing_object_through_interfaces : AutoMapperSpecBase
{
    private class2DTO _result;

    public class class1 : iclass1
    {
        public string prop1 { get; set; }
    }

    public class class2 : class1, iclass2
    {
        public string prop2 { get; set; }
    }

    public class class1DTO : iclass1DTO
    {
        public string prop1 { get; set; }
    }

    public class class2DTO : class1DTO, iclass2DTO
    {
        public string prop2 { get; set; }
    }

    public interface iclass1
    {
        string prop1 { get; set; }
    }

    public interface iclass2
    {
        string prop2 { get; set; }
    }

    public interface iclass1DTO
    {
        string prop1 { get; set; }
    }

    public interface iclass2DTO
    {
        string prop2 { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {
        cfg.CreateMap<iclass1, iclass1DTO>();
        cfg.CreateMap<iclass2, iclass2DTO>();
    });

    protected override void Because_of()
    {
        var bo = new class2 { prop1 = "PROP1", prop2 = "PROP2" };
        _result = Mapper.Map(bo, new class2DTO());
    }

    [Fact]
    public void Should_use_the_most_derived_interface()
    {
        _result.prop2.ShouldBe("PROP2");
    }
}

public class When_mapping_an_interface_to_an_abstract_type : AutoMapperSpecBase
{
    private DtoObject _result;

    public class ModelObject
    {
        public IChildModelObject Child { get; set; }
    }

    public interface IChildModelObject
    {
        string ChildProperty { get; set; }
    }

    public class SubChildModelObject : IChildModelObject
    {
        public string ChildProperty { get; set; }
    }

    public class DtoObject
    {
        public DtoChildObject Child { get; set; }
    }

    public abstract class DtoChildObject
    {
        public virtual string ChildProperty { get; set; }
    }

    public class SubDtoChildObject : DtoChildObject
    {
    }

    protected override void Because_of()
    {
        var model = new ModelObject
        {
            Child = new SubChildModelObject {ChildProperty = "child property value"}
        };
        _result = Mapper.Map<ModelObject, DtoObject>(model);
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {

        cfg.CreateMap<ModelObject, DtoObject>();

        cfg.CreateMap<IChildModelObject, DtoChildObject>()
            .Include<SubChildModelObject, SubDtoChildObject>();

        cfg.CreateMap<SubChildModelObject, SubDtoChildObject>();
    });

    [Fact]
    public void Should_map_Child_to_SubDtoChildObject_type()
    {
        _result.Child.ShouldBeOfType(typeof (SubDtoChildObject));
    }

    [Fact]
    public void Should_map_ChildProperty_to_child_property_value()
    {
        _result.Child.ChildProperty.ShouldBe("child property value");
    }
}

public class When_mapping_a_concrete_type_to_an_interface_type : AutoMapperSpecBase
{
    private IDestination _result;

    public class Source
    {
        public int Value { get; set; }
        public int Value1 { get; set; }
    }

    public interface IDestination
    {
        int Value { get; set; }
        int Value2 { get; set; }
        string Value3 { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>cfg.CreateMap<Source, IDestination>().AsProxy()
        .ForMember(x => x.Value2, o => o.MapFrom(x => x.Value1))
        .ForMember(x => x.Value3, o => o.Ignore())
        .AfterMap((_, d) =>
        {
            d.Value3 = "value 3";
        }));

    protected override void Because_of()
    {
        _result = Mapper.Map<Source, IDestination>(new Source {Value = 5, Value1 = 50});
    }

    [Fact]
    public void Should_create_an_implementation_of_the_interface()
    {
        _result.Value.ShouldBe(5);
    }

    [Fact]
    public void Should_apply_rules_after_proxying()
    {
        _result.Value2.ShouldBe(50);
        _result.Value3.ShouldBe("value 3");
    }

    [Fact]
    public void Should_not_derive_from_INotifyPropertyChanged()
    {
        _result.ShouldNotBeOfType<INotifyPropertyChanged>();
    }
}

public class When_mapping_an_interface_type_to_a_concrete_type_and_reverse : AutoMapperSpecBase
{
    public interface ISource
    {
        int Value { get; set; }
    }

    public class Destination
    {
        public int Value { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
        cfg.CreateMap<ISource, Destination>().ReverseMap());

    [Fact]
    public void Should_not_convert_to_interface()
    {
        Should.Throw<AutoMapperMappingException>(() => Mapper.Map<Destination, ISource>(new Destination {Value = 5}))
            .Message.ShouldStartWith("Cannot create interface " + typeof(ISource).FullName);
    }
}

public class When_mapping_an_interface_type_to_an_interface_type_and_reverse : AutoMapperSpecBase
{
    public interface ISource
    {
        int Value { get; set; }
    }

    public class Source: ISource
    {
        public int Value { get; set; }
    }

    public interface IDestination
    {
        int Value { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
        cfg.CreateMap<ISource, IDestination>().AsProxy().ReverseMap().AsProxy());

    [Fact]
    public void Should_create_an_implementation_of_the_destination_interface()
    {
        var destination = Mapper.Map<ISource, IDestination>(new Source {Value = 5});
        destination.Value.ShouldBe(5);
    }

    [Fact]
    public void Should_map_implementation_of_the_interface_to_the_proxied_implementation()
    {
        var destination = Mapper.Map<ISource, IDestination>(new Source {Value = 5});
        var reversed = Mapper.Map<IDestination, ISource>(destination);

        reversed.ShouldNotBeOfType<Source>();
        reversed.Value.ShouldBe(5);
    }
}

public class When_mapping_a_concrete_type_to_an_interface_type_and_reverse : AutoMapperSpecBase
{
    public class Source
    {
        public int Value { get; set; }
    }

    public interface IDestination
    {
        int Value { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
        cfg.CreateMap<Source, IDestination>().AsProxy().ReverseMap());

    [Fact]
    public void Should_create_an_implementation_of_the_destination_interface()
    {
        var destination = Mapper.Map<Source, IDestination>(new Source {Value = 5});
        destination.Value.ShouldBe(5);
    }

    [Fact]
    public void Should_map_implementation_of_the_interface_to_the_class()
    {
        var destination = Mapper.Map<Source, IDestination>(new Source {Value = 5});
        var reversed = Mapper.Map<IDestination, Source>(destination);

        reversed.Value.ShouldBe(5);
    }
}

public class When_mapping_a_concrete_type_to_an_interface_type_that_derives_from_INotifyPropertyChanged : AutoMapperSpecBase
{
    private IDestination _result;

    private int _count;

    public class Source
    {
        public int Value { get; set; }
    }

    public interface IDestination : INotifyPropertyChanged
    {
        int Value { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg => cfg.CreateMap<Source, IDestination>().AsProxy());

    protected override void Because_of()
    {
        _result = Mapper.Map<Source, IDestination>(new Source {Value = 5});
    }

    [Fact]
    public void Should_create_an_implementation_of_the_interface()
    {
        _result.Value.ShouldBe(5);
    }

    [Fact]
    public void Should_derive_from_INotifyPropertyChanged()
    {
        var q = _result as INotifyPropertyChanged;
        q.ShouldNotBeNull();
    }

    [Fact]
    public void Should_notify_property_changes()
    {
        var count = 0;
        _result.PropertyChanged += (o, e) => {
            count++;
            o.ShouldBeSameAs(_result);
            e.PropertyName.ShouldBe("Value");
        };

        _result.Value = 42;
        count.ShouldBe(1);
        _result.Value.ShouldBe(42);
    }

    [Fact]
    public void Should_detach_event_handler()
    {
        _result.PropertyChanged += MyHandler;
        _count.ShouldBe(0);

        _result.Value = 56;
        _count.ShouldBe(1);

        _result.PropertyChanged -= MyHandler;
        _count.ShouldBe(1);

        _result.Value = 75;
        _count.ShouldBe(1);
    }

    private void MyHandler(object sender, PropertyChangedEventArgs e) {
        _count++;
    }
}

public class When_mapping_a_derived_interface_to_an_derived_concrete_type : AutoMapperSpecBase
{
    private Destination _result = null;

    public interface ISourceBase
    {
        int Id { get; }
    }

    public interface ISource : ISourceBase
    {
        int SecondId { get; }
    }

    public class Source : ISource
    {
        public int Id { get; set; }
        public int SecondId { get; set; }
    }

    public abstract class DestinationBase
    {
        public int Id { get; set; }
    }

    public class Destination : DestinationBase
    {
        public int SecondId { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {
        cfg.CreateMap<ISource, Destination>();
    });

    protected override void Because_of()
    {
        _result = Mapper.Map<ISource, Destination>(new Source {Id = 7, SecondId = 42});
    }

    [Fact]
    public void Should_map_base_interface_property()
    {
        _result.Id.ShouldBe(7);
    }

    [Fact]
    public void Should_map_derived_interface_property()
    {
        _result.SecondId.ShouldBe(42);
    }
}

public class When_mapping_a_derived_interface_to_an_derived_concrete_type_with_readonly_interface_members : AutoMapperSpecBase
{
    private Destination _result = null;

    public interface ISourceBase
    {
        int Id { get; }
    }

    public interface ISource : ISourceBase
    {
        int SecondId { get; }
    }

    public class Source : ISource
    {
        public int Id { get; set; }
        public int SecondId { get; set; }
    }

    public interface IDestinationBase
    {
        int Id { get; }
    }

    public interface IDestination : IDestinationBase
    {
        int SecondId { get; }
    }

    public abstract class DestinationBase : IDestinationBase
    {
        public int Id { get; set; }
    }

    public class Destination : DestinationBase, IDestination
    {
        public int SecondId { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {
        cfg.CreateMap<ISource, Destination>();
    });

    protected override void Because_of()
    {
        _result = Mapper.Map<ISource, Destination>(new Source {Id = 7, SecondId = 42});
    }

    [Fact]
    public void Should_map_base_interface_property()
    {
        _result.Id.ShouldBe(7);
    }

    [Fact]
    public void Should_map_derived_interface_property()
    {
        _result.SecondId.ShouldBe(42);
    }
}

public class When_mapping_to_a_type_with_explicitly_implemented_interface_members : AutoMapperSpecBase
{
    private Destination _destination;

    public class Source
    {
        public int Value { get; set; }
    }

    public interface IOtherDestination
    {
        int OtherValue { get; set; }
    }

    public class Destination : IOtherDestination
    {
        public int Value { get; set; }
        int IOtherDestination.OtherValue { get; set; }
    }

    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {
        cfg.CreateMap<Source, Destination>();
    });

    protected override void Because_of()
    {
        _destination = Mapper.Map<Source, Destination>(new Source {Value = 10});
    }

    [Fact]
    public void Should_ignore_interface_members_for_mapping()
    {
        _destination.Value.ShouldBe(10);
    }
}

public class MappingToInterfacesWithPolymorphism : AutoMapperSpecBase
{
    private BaseDto[] _baseDtos;

    public interface IBase { }
    public interface IDerived : IBase { }
    public class Base : IBase { }
    public class Derived : Base, IDerived { }
    public class BaseDto { }
    public class DerivedDto : BaseDto { }

    //and following mappings:
    protected override MapperConfiguration CreateConfiguration() => new(cfg =>
    {
        cfg.CreateMap<Base, BaseDto>().Include<Derived, DerivedDto>();
        cfg.CreateMap<Derived, DerivedDto>();
        cfg.CreateMap<IBase, BaseDto>().Include<IDerived, DerivedDto>();
        cfg.CreateMap<IDerived, DerivedDto>();
    });

    protected override void Because_of()
    {
        List<Base> list = new List<Base>() { new Derived() };
        _baseDtos = Mapper.Map<IEnumerable<Base>, BaseDto[]>(list);
    }

    [Fact]
    public void Should_use_the_derived_type_map()
    {
        _baseDtos.First().ShouldBeOfType<DerivedDto>();
    }

}