AutoMapper ignore member failing when mapping with Type objects
Using AutoMapper, I'm trying to map two types that I pull from two different assemblies via reflection. However, when working with Types, I am unable to get the .ForMember() method to ignore any members that I specify. The regular lambda syntax does not compile because the member name is not found on the Type type of the class. Passing in a string of the member allows compilation, but still does not ignore the member. Using config.AssertConfigurationIsValid() shows that this is an invalid configuration.
class ExampleSchema
{
public int Age {get; set;}
}
class ExampleDto
{
public int Age {get; set;}
public int Weight {get; set;}
}
In the code that reflects over the above assemblies:
var schemaType = typeof(ExampleSchema);
var dtoType = typeof(ExampleDto);
// This will throw
// Cannot convert lambda expression to string because it is not a delegate type
cfg.CreateMap(schemaType, dtoType)
.ForMember(dest => dest., opt => opt.Ignore());
// Hard-code cringing aside, this still does not filter out the member
cfg.CreateMap(schemaType, dtoType)
.ForMember("Weight", opt => opt.Ignore());
Is this a bug in AutoMapper or am I just using the method incorrectly?
I wrote a small test to see what is happening
[TestMethod]
public void TestMethod3()
{
var schemaType = typeof(ExampleSchema);
var dtoType = typeof(ExampleDto);
MapperConfiguration config = new MapperConfiguration(cfg =>
{
cfg.CreateMap(schemaType, dtoType)
.ForMember("Weight", conf => conf.Ignore());
});
config.AssertConfigurationIsValid();
var mapper = config.CreateMapper();
var schema = new ExampleSchema { Age = 10 };
var dto = mapper.Map<ExampleDto>(schema);
Assert.AreEqual(dto.Age, 10);
Assert.AreEqual(dto.Weight, 0);
}
And it is green. You don't even need to configure anything.
Make your properties public and use
cfg.CreateMap<ExampleSchema, ExampleDto>()
. Then you will have an access to ForMember overload that accepts Expression parameter.
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