Dynamic Include statements for eager loading in a query - EF 4.3.1

Question

I have this method:

public CampaignCreative GetCampaignCreativeById(int id)
        {
            using (var db = GetContext())
            {
                        


        

Answer 1

I wrote this method to retrieve any set of entity dynamically based on their types. I used the IDbEntity interface to provide a valid key to search the userId in all the classes. The Util.GetInverseProperties() method is used to get the properties needed in the Include statement.

public IEnumerable GetItems(string userId) where T : class, IDbEntity
{
    var query = db.Set().Where(l => l.UserId==userId);

    var props = Util.GetInverseProperties();
    foreach (var include in props)
        query = query.Include(include.Name);

    return query
        .AsNoTracking()
        .ToList();
}

public interface IDbEntity
{
    public string UserId { get; set; }
}

public static List GetInverseProperties()
{
    return typeof(T)
        .GetProperties()
        .Where(p => Attribute.IsDefined(p, typeof(InversePropertyAttribute)))
        .ToList();
}