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 one of my viewmodels.
I have created a custom resolver to try to handle this mapping, using the following code:
public class TagToStringResolver : ValueResolver<Tag, string>
{
protected override string ResolveCore(Tag source)
{
return source.Name ?? string.Empty;
}
}
I am mapping using the following code:
Mapper.CreateMap<Tag, String>()
.ForMember(d => d, o => o.ResolveUsing<TagToStringResolver>());
When I run the application I get the error:
Custom configuration for members is only supported for top-level individual members on a type.
What am I doing wrong?
This is because you are trying to map to the actual destination type rather than a property of the destination type. You can achieve what you want with:
Mapper.CreateMap<Tag, string>().ConvertUsing(source => source.Name ?? string.Empty);
although it would be a lot simpler just to override ToString on the Tag class.
ForMember means you are providing mapping for a member where you want a mapping between type. Instead, use this :
Mapper.CreateMap<Tag, String>().ConvertUsing<TagToStringConverter>();
And Converter is
public class TagToStringConverter : ITypeConverter<Tag, String>
{
public string Convert(ResolutionContext context)
{
return (context.SourceValue as Tag).Name ?? string.Empty;
}
}
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