private static void CheckForInvalidChanges(TrackedObject tracked)
{
foreach (MetaDataMember member in tracked.Type.PersistentDataMembers)
{
if (((member.IsPrimaryKey || member.IsDbGenerated) || member.IsVersion) &&
tracked.HasChangedValue(member))
{
if (member.IsPrimaryKey)
{
throw Error.IdentityChangeNotAllowed(member.Name, tracked.Type.Name);
}
throw Error.DbGeneratedChangeNotAllowed(member.Name, tracked.Type.Name);
}
}
}
private static Expression GetUpdateCheck(Expression serverItem, TrackedObject tracked)
{
MetaType type = tracked.Type;
if (type.VersionMember != null)
{
return(Expression.Equal(GetMemberExpression(serverItem, type.VersionMember.Member), GetMemberExpression(Expression.Constant(tracked.Current), type.VersionMember.Member)));
}
Expression left = null;
foreach (MetaDataMember member in type.PersistentDataMembers)
{
if (!member.IsPrimaryKey)
{
UpdateCheck updateCheck = member.UpdateCheck;
if ((updateCheck == UpdateCheck.Always) || ((updateCheck == UpdateCheck.WhenChanged) && tracked.HasChangedValue(member)))
{
object boxedValue = member.MemberAccessor.GetBoxedValue(tracked.Original);
Expression right = Expression.Equal(GetMemberExpression(serverItem, member.Member), Expression.Constant(boxedValue, member.Type));
left = (left != null) ? Expression.And(left, right) : right;
}
}
}
return(left);
}