Created
February 28, 2012 12:28
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Automapper extension to IGNORE unmapped properties for a given type
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public static class AutoMapperExtensions | |
{ | |
public static IMappingExpression<TSource, TDestination> | |
IgnoreAllNonExisting<TSource, TDestination>(this IMappingExpression<TSource, TDestination> expression) | |
{ | |
var sourceType = typeof(TSource); | |
var destinationType = typeof(TDestination); | |
var existingMaps = Mapper.GetAllTypeMaps().First(x => x.SourceType.Equals(sourceType) && x.DestinationType.Equals(destinationType)); | |
foreach (var property in existingMaps.GetUnmappedPropertyNames()) | |
{ | |
expression.ForMember(property, opt => opt.Ignore()); | |
} | |
return expression; | |
} | |
} | |
// USAGE: | |
Mapper.CreateMap<SourceType, DestinationType>() | |
.ForMember(prop => x.Property, opt => opt.MapFrom(src => src.OtherProperty)) | |
.IgnoreAllNonExisting(); |
Above extension is not working with Automapper 5.0.2
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This is a very useful extension for working with types with many properties. Unfortunately, it doesn't work with types that inherit from a base class (line 11 throws a NullReferenceException). One workaround is to provide explicit mappings or ignores for base class properties.