Is there an option to make Entity Framework revert empty strings to null?

Question

I am using an ADO.NET Entity-Framework ObjectContext to access my data store.

I want the if values are set with empty strings, they should automatically become null.

Answer 1

I've just adapted the code above to the new release of Entity Framework 4.1 (DbContext).

public override int SaveChanges()
    {
        var objContext = ((IObjectContextAdapter)this).ObjectContext;
        var entries = objContext.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Modified).Select(
                entry => entry.Entity);
        foreach (var entity in entries)
        {
            string str = typeof(string).Name;
            var properties = from p in entity.GetType().GetProperties()
                             where p.PropertyType.Name == str
                             select p;

            foreach (var item in properties)
            {
                string value = (string)item.GetValue(entity, null);
                if (value != null && value.Trim().Length == 0)
                {

                    item.SetValue(entity, null, null);

                }
            }
        }
        return base.SaveChanges();