Syntax for virtual members

Question

Consider the following class written in c# .net 4.0 (typically found in a nhibernate class):

public class CandidateEntity : EntityBase
{
    public virtual IList<GradeEntity> Grades { get; set; }

    public CandidateEntity()
    {
         Grades = new List<GradeEntity>(); 
    }
}

This line gets a well founded warning "virtual member call in the constructor". Where shall I initialize this collection ?

Regards,

Answer 1

The backing field is one way. Another is to use a private setter. This works well in nHibernate.

public virtual IList<GradeEntity> Grades { get; private set; }

public CandidateEntity()
{
     Grades = new List<GradeEntity>();
}