Custom value for Condition in Automapper

Question

I have a scenario like

If total number of days is less than 30 days, then I have to set Salary to null

this.CreateMap<Foo, Doo>()
    .ForMember(dst => dst.Salary, opt => {
                              opt.Condition(src => src.JoinedDate.Days <= 30));
                              opt.MapFrom(null)
}

But I am facing error "cannot find member of type Foo. Parameter name: name". but don't have any property "name".

Question is How to pass null value to destination property in condition check, and retain existing value if days greater than 30.

opt.MapFrom(null)

Guru Stron · Accepted Answer · 2020-08-17 14:00:40Z

2

Try using:

this.CreateMap<Foo, Doo>()
    .ForMember(dst => dst.Salary, 
        opt => opt.MapFrom(src => src.JoinedDate.Days <= 30 ? null : src.Salary))

UPD

To preserve Salary from destination use overload of MapFrom accepting both source and destination:

this.CreateMap<Foo, Doo>()
    .ForMember(dst => dst.Salary, 
        opt => opt.MapFrom((src, dst) => src.JoinedDate.Days <= 30 ? null : dst.Salary))

edited Aug 17, 2020 at 14:00

answered Aug 17, 2020 at 13:37

Guru Stron

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3 Comments

Jag Over a year ago

If condition fails, then I have to retain my existing Salary. so which means : src.Salary supposed to be dst.Salary, but it is inaccessible

Guru Stron Over a year ago

@Munijagadish what version are you using? Latest one works fine for me.

Jag Over a year ago

Mine is not last version, However both above answers helped to figure out solution.. I will add answer

Navoneel Talukdar · Accepted Answer · 2020-08-17 13:37:15Z

1

You can use automapper inline ResolveUsing.

ForMember(dst => dst.Salary,
            o => o.ResolveUsing(src => src.JoinedDate.Days > 30 ? src.Salary: null));

answered Aug 17, 2020 at 13:37

Navoneel Talukdar

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1 Comment

Jag Over a year ago

If condition fails, then I have to retain my existing Salary. so which means : src.Salary supposed to be dst.Salary, but it is inaccessible

Jag · Accepted Answer · 2020-08-17 14:52:11Z

1

I just combined above two solutions and found answer for my question.

ForMember(dst => dst.Salary,
            opt => opt.ResolveUsing((src, dst) => src.JoinedDate.Days <= 30 ? null: dst.Salary));

answered Aug 17, 2020 at 14:52

Jag

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