/// <summary>
/// Writes an *implementation specific* bundled .NET object, including (as options) type-metadata, identity/re-use, etc.
/// </summary>
public static SubItemToken WriteNetObject_Start(object value, ProtoWriter dest, BclHelpers.NetObjectOptions options, out int dynamicTypeKey, out bool writeObject)
{
#if FEAT_IKVM
throw new NotSupportedException();
#else
if (dest == null)
{
throw new ArgumentNullException(nameof(dest));
}
dynamicTypeKey = -1;
// length not prefixed to not move data in buffer twice just because of NetObject (will be another nested inside)
SubItemToken token = ProtoWriter.StartSubItem(null, false, dest);
if (value == null)
{
// null handling
writeObject = false;
return(token);
}
// even root object can be wrapped with collection
// so it's not true root
writeObject = true;
if ((options & BclHelpers.NetObjectOptions.AsReference) != 0)
{
bool existing;
int objectKey = dest.NetCache.AddObjectKey(value, out existing);
ProtoWriter.WriteFieldHeader(existing ? FieldExistingObjectKey : FieldNewObjectKey, WireType.Variant, dest);
ProtoWriter.WriteInt32(objectKey, dest);
if (existing)
{
writeObject = false;
}
}
if (writeObject)
{
if ((options & BclHelpers.NetObjectOptions.DynamicType) != 0)
{
bool existing;
Type type = value.GetType();
dynamicTypeKey = dest.GetTypeKey(ref type);
int typeRefKey = dest.NetCache.AddObjectKey(type, out existing);
ProtoWriter.WriteFieldHeader(existing ? FieldExistingTypeKey : FieldNewTypeKey, WireType.Variant, dest);
ProtoWriter.WriteInt32(typeRefKey, dest);
if (!existing)
{
ProtoWriter.WriteFieldHeader(FieldTypeName, WireType.String, dest);
ProtoWriter.WriteString(dest.SerializeType(type), dest);
}
}
// do nothing, write will be outside
ProtoWriter.WriteFieldHeaderBegin((options & BclHelpers.NetObjectOptions.WriteAsLateReference) != 0 ? FieldLateReferenceObject : FieldObject, dest);
}
return(token);
#endif
}
