You can have your datacontext fix up all the relevant values as it goes. The following does so with a cache of properties for entity types, so as to avoid having to examine the type each time:
public class YourContext : DbContext
{
private static readonly List EmptyPropsList = new List();
private static readonly Hashtable PropsCache = new Hashtable(); // Spec promises safe for single-reader, multiple writer.
// Spec for Dictionary makes no such promise, and while
// it should be okay in this case, play it safe.
private static List GetDateProperties(Type type)
{
List list = new List();
foreach(PropertyInfo prop in type.GetProperties())
{
Type valType = prop.PropertyType;
if(valType == typeof(DateTime) || valType == typeof(DateTime?))
list.Add(prop);
}
if(list.Count == 0)
return EmptyPropsList; // Don't waste memory on lots of empty lists.
list.TrimExcess();
return list;
}
private static void FixDates(object sender, ObjectMaterializedEventArgs evArg)
{
object entity = evArg.Entity;
if(entity != null)
{
Type eType = entity.GetType();
List rules = (List)PropsCache[eType];
if(rules == null)
lock(PropsCache)
PropsCache[eType] = rules = GetPropertyRules(eType); // Don't bother double-checking. Over-write is safe.
foreach(var rule in rules)
{
var info = rule.PropertyInfo;
object curVal = info.GetValue(entity);
if(curVal != null)
info.SetValue(entity, DateTime.SpecifyKind((DateTime)curVal, rule.Kind));
}
}
}
public YourContext()
{
((IObjectContextAdapter)this).ObjectContext.ObjectMaterialized += FixDates;
/* rest of constructor logic here */
}
/* rest of context class here */
}
This can also be combined with attributes so as to allow one to set the DateTimeKind each property should have, by storing a set of rules about each property, rather than just the PropertyInfo, and looking for the attribute in GetDateProperties.
