LINQ and AutoMapper

Question

I\'m wondering if there is anything I can do to get this working as expected. This works fine in my code:

        var roles = _securityContext.Set

        

Answer 1

You're operating on IQueryable, which tries to translate the method you supply into SQL. Obviously, it's not going to happen, as you're passing AutoMapper related magic. There's an easy solution, you have to force execution before mapping:

return roles.ToList().Select(role => Mapper.Map<Role, RoleDto>(role)).ToList();

[EDIT] As Daniel suggests in comments, you can always go from IQueryable to IEnumerable by calling AsEnumerable() and still defer execution:

return roles.AsEnumerable().Select(role => Mapper.Map<Role, RoleDto>(role)).ToList();