AutoMapper error after upgrading to .NET 7

Question

I upgraded a .NET Core 2.1 app to .NET 7 and upgraded the AutoMapper version that was being used to the latest version.

I had to change the ResolveUsing calls to MapFrom as the earlier was not available in the new version of the AutoMapper.

Now when I run the app, I am getting the following error:

Error: Method not found: '!!1 AutoMapper.IMapper.Map(!!0)'.

I have found that it's happening to Methods that are using the automapper where it's using a custom method:

.ForMember(dest => dest.RoleName, opt => opt.MapFrom(src => CustomResolvers.GetRoleName(src)))

The above CustomResolvers is a static public class and GetRoleName is a static method. This was fine using ResolveUsing in the earlier version of automapper but changing to MapFrom, causes the above mentioned error.

Any help would be greatly appreciated. Thanks Angelo

I search about this error, In most cases it is caused by inappropriate version , But you are using the latest version... — Xinran Shen
– Xinran Shen, Commented Sep 15, 2023 at 2:11

Angelo · Accepted Answer · 2023-09-18 02:36:27Z

0

It was just that a project that I was referencing was using the Automapper and that had the older version of Automapper.

Once I updated the Automapper for that project, everything is fine.

Thanks Angelo

answered Sep 18, 2023 at 2:36

Angelo

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