C# Automapper Ignore methods ProjectTo<TModel>()

How can I ignore public methods in my entity class while automapping using ProjectTo<TModel>().

var query = userRepository.GetQuery<UserViewModel>()
        .OrderBy(x => x.First_name).AsQueryable();

cfg.CreateMap<AspNetUser, UserViewModel>(MemberList.None);
// Cannot add method to ignore here

Its giving this error:

on function return query.ProjectTo<TModel>(); 'Member 'System.String GetFullName()' not field or property'

public virtual IQueryable<TModel> GetQuery<TModel>(Expression<Func<TEntity, bool>> filter = null,
            Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null)
{
    IQueryable<TEntity> query = DbSet;

    if (filter != null)
        query = query.Where(filter);

    if (orderBy != null)
        return orderBy(query).ProjectTo<TModel>();
    
    return query.ProjectTo<TModel>();
}

My Entity Class :

public AspNetUser()
{
    public string Id { get; set; }      
    public string First_name { get; set; }
    public string Middle_name { get; set; }
    public string Last_name { get; set; }

    public string GetFullName()
    {
        return string.Join(" ", new[] { First_name, Middle_name, Last_name }.Where(c => !string.IsNullOrEmpty(c)));
    }
}