AutoMapper - map a property without a `set;` implementation

Question

Is there some way to map a IList<> property which does not have a set; method?

Source Class:

public class SourceClass
{
    private IList<string> strings;

    public IList<string> Strings { get { return this.strings; } }

    public SourceClass() { this.strings = new List<string>() { "s1", "s2", "s3" };
    //...
}

Destionation Class:

public class DestinationClass
{
    private IList<string> strings;

    public IList<string> Strings { get { return this.strings; } }

    public DestinationClass() { this.strings = new List<string>();
    //...
}

As you can see, neither class has set; implemented. The result is that when I perform AutoMapper.Mapper.Map<SourceClass, DestinationClass>(source, destination), the Strings property is empty.

The obvious solution is to provide a set; implementation is DestinationClass, however, I would like to know how to provide a custom configuration in order to deal with these troubles.

Currently, my configuration is:

public class XProfile : AutoMapper.Profile
{
    protected override void Configure()
    {
        AutoMapper.Mapper.CreateMap<SourceClass, DestinationClass>();
    }
}

score 2 · Answer 1 · answered Dec 29 '15 at 14:53

2

You can configure AutoMapper to recognize non-public members. Check out the documentation

answered Dec 29 '15 at 14:53

Martino Bordin

1,412
1
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29

score 2 · Accepted Answer · answered Dec 29 '15 at 14:55

You could create a constructor like this.

public class DestinationClass
{
    private IList<string> strings;

    public IList<string> Strings { get { return this.strings; } }

    public DestinationClass() : this(new List<string>()) { }

    public DestinationClass(IList<string> strs) {
        strings = strs.ToList(); // clone it
    }
    //...
}

Then you can make the mapping with the ConstructUsing method, to tell AutoMapper to call the constructor that you created.

public class XProfile : AutoMapper.Profile
{
    protected override void Configure()
    {
        AutoMapper.Mapper.CreateMap<SourceClass, DestinationClass>()
            .ConstructUsing(x => new DestinationClass(x.Strings));
    }
}

Joel R Michaliszen · Answer 3 · 2015-12-29T14:59:33.780

If you're working with immutable object, i suggest to you pass it as parameter to destination class, and it will be like this:

AutoMapper.Mapper.CreateMap<SourceClass, DestinationClass>()
  .ConstructUsing(s => new DestinationClass(s.Strings))

And the DestinationClass:

public class DestinationClass
{
    private IList<string> strings;

    public IList<string> Strings { get { return this.strings; } }

    public DestinationClass(List<string> strings = null)
    { 
        this.strings = strings ?? new List<string>();
    }
   //...
}

AutoMapper - map a property without a `set;` implementation

3 Answers3