How to ignore null values for all source members during mapping in Automapper 6?

c# mapping automapper
Sikor picture Sikor · May 13, 2017 · Viewed 32.2k times · Source

I've been looking everywhere: stackoverflow, automapper documentation, internets and just couldn't find any info on this one, even tho this seems to be a very common problem.

My mapping:

CreateMap<StatusLevelDTO, StatusLevel>()
            .ForAllMembers(opt => opt.Condition(src => src != null));

This doesn't work because src represents source object (StatusLevelDTO), not a source property (I think).

To be more specific, If I map ObjectA to ObjectB, ObjectA.SomeValue is null and ObjectB.SomeValue is 2, I want the destination object to keep its value (2).

I've seen this question: Automapper skip null values with custom resolver and tried the first two answers but they both seem to be outdated for version 6.

Is there any way to make this happen in Automapper 6? I am using 6.0.2 to be exact.

Answer

Sergey Berezovskiy picture Sergey Berezovskiy · May 13, 2017

Method Condition now has five overloads, one of which accepts predicate of type 

Func<TSource, TDestination, TMember, bool>

this TMember parameter is the source member. So you can check source member for null:

CreateMap<StatusLevelDTO, StatusLevel>()
     .ForAllMembers(opts => opts.Condition((src, dest, srcMember) => srcMember != null));

Related questions

Using AutoMapper to map the property of an object to a string

I have the following model: public class Tag { public int Id { get; set; } public string Name { get; set; } } I want to be able to use AutoMapper to map the Name property of the Tag type to a string property in …

Read More
How to configure Automapper to automatically ignore properties with ReadOnly attribute?

Context: Let's say I have the following "destination" class: public class Destination { public String WritableProperty { get; set; } public String ReadOnlyProperty { get; set; } } and a "source" class with the ReadOnly attribute on one of it's properties: public class Source { public String …

Read More
How to use mapper.Map inside MapperConfiguration of AutoMapper?

I need to map an object to another one using AutoMapper. The tricky question is how can I access an instance of the mapper (instance of IMapper) inside of the mapping configuration or inside of a custom type converter? The …

Read More