Automapper 5.0.2: System.Guid and TryExpression

[alecrt]

I get the following error using Automapper 5.0.2 on .NET Core RTM (netcoreapp1.0 only)

TryExpression is not supported as a child expression when accessing a member on type 'System.Guid' >because it is a value type. Construct the tree so the TryExpression is not nested inside of this expression.

I had no problem with previous 4.2.1 version

[jonsagara]

I get the same error when trying to map an object like this:

public class MyObject
{
    public Guid Id { get; set; }
    public string Name { get; set; }

    public override string ToString() => Name;
}

to a System.Web.Mvc.SelectListItem.

Mapping:

CreateMap<MyObject, SelectListItem>()
            .ForMember(d => d.Text, o => o.MapFrom(s => s.Name))
            .ForMember(d => d.Value, o => o.MapFrom(s => s.Id))
            .ForMember(d => d.Group, o => o.Ignore())
            .ForMember(d => d.Disabled, o => o.Ignore())
            .ForMember(d => d.Selected, o => o.Ignore());

Note that changing the third line of the mapping to o.MapFrom(s => s.Id.ToString())) (i.e., explicitly mapping as a string) fixed the error for me.

So is it correct to say that AutoMapper <= 4.x automatically converted to a string, whereas you must be explicit about your mappings in AutoMapper >= 5.x?

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.