c# - Automapper ResolveUsing cause "Can't resolve this to Queryable Expression" -

i'm using autommaper map domain classes model classes , viceversa. need encrypt/decrypt 1 property. when map model domain there isn't problem, work perefectly:

mapper.createmap<entitymodel, entity>().formember(dest => dest.password, opt => opt.resolveusing(src => this.encryptstring(src.password))) 

but when map entity model automapper crash , throws "can't resolve queryable expression":

mapper.createmap<entity, entitymodel>().formember(dest => dest.password, opt => opt.resolveusing(src => this.decryptstring(src.password))) 

i've tried custom value resolver too, same result:

mapper.createmap<entity, entitymodel>().formember(dest => dest.password, op => op.resolveusing<passwordresolver>().frommember(x => x.password));   public class passwordresolver : valueresolver<object, string> {         protected override string resolvecore(object source)     {         return "test";     }  } 

as documentation states, can't use custom resolvers in queryable expressions:

https://github.com/automapper/automapper/wiki/queryable-extensions#supported-mapping-options

you can, however, use mapfrom:

mapper.createmap<entity, entitymodel>()     .formember(dest => dest.password, op => op.mapfrom(src => "test")); 

i'm guessing that's not want password property that's how can fix example.