Ignore a property in AutoMapper?

问题:

I'm using Automapper to copy one object properties to other and later will update in database using EF.

Question is how to tell Automapper copy every property but ignore a particular property (in this case it will be Id). I'm new to AutoMapper and just have done this code. I don't have other configurations or use of AutoMap in project.

Mapper.Map(lead, existingLead);

I have downloaded AutoMapper form here https://github.com/AutoMapper/AutoMapper

回答1:

On your Mapper.CreateMap<Type1, Type2>() you can use either

.ForSourceMember(x => x.Id, opt => opt.Ignore())

or

.ForMember(x => x.Id, opt => opt.Ignore())

UPDATE: It seems like .Ignore() is renamed to .DoNotValidate() according to the AutoMapper docs.

回答2:

I use this extension method:

public static IMappingExpression<TSource, TDestination> IgnoreMember<TSource, TDestination>(
    this IMappingExpression<TSource, TDestination> map, Expression<Func<TDestination, object>> selector)
{
    map.ForMember(selector, config => config.Ignore());
    return map;
}

and I use it like this

Mapper.CreateMap<MyType1, MyType2>().IgnoreMember(m => m.PropertyName);

Hope that helps.