public static Type GetObjectKeyType(this XPObjectSpace objectSpace,
Type objectType)
{
Type result = null;
var xpClassInfo = objectSpace.FindXPClassInfo(objectType);
if (xpClassInfo != null)
{
Type queryableType = xpClassInfo.ClassType;
if (queryableType.IsInterface)
{
queryableType = PersistentInterfaceHelper.GetPersistentInterfaceDataType(queryableType);
xpClassInfo = objectSpace.Session.GetClassInfo(queryableType);
}
XPMemberInfo keyMember = xpClassInfo.KeyProperty;
if (keyMember != null)
{
if (!keyMember.IsStruct)
{
if (keyMember.ReferenceType != null)
{
result = objectSpace.GetObjectKeyType(keyMember.ReferenceType.ClassType);
}
else
{
return(keyMember.MemberType);
}
}
else
{
throw new NotImplementedException();
}
}
}
return(result);
}
