MapperException: Can't find a concrete type for abstract type or interface about detached-mapper HOT 2 CLOSED

I've found the solution for my problem:

.UseDetached(cfg =>
{
    cfg.ConcreteTypes.Add(typeof(Geometry), typeof(Polygon));
}));

from detached-mapper.

Hi!
That's one possible solution, if you have only 1 type of geometry.
If there are may, e.g.: Geometry -> Polygon, Geometry -> Ellipse, Geometry -> Rectangle you may configure Entity Framework's Inheritance using a discriminator. The mapper will pick the settings from there.

from detached-mapper.