BACnet.Tagging.TagReaderStream.EnterChoice C# (CSharp) Method

        public byte EnterChoice()
        {
            _require(StreamOp.EnterChoice);
            _reader.ReadOpenTag(_state.Tag);

            var choice = ((ChoiceSchema)_state.Schema);
            for(int i = 0; i < choice.Fields.Length; i++)
            {
                var field = choice.Fields[i];
                var expected = Utils.GetExpectedTag(field.Tag, field.Type);

                if (_reader.AtTag(expected.ContextTag, expected.ApplicationTag))
                {
                    _stack.Push(new SchemaState(choice, _state.Tag, (byte)i));
                    _state = new SchemaState(field.Type, field.Tag, -1);
                    return (byte)i;
                }
            }

            throw new UnexpectedTagException();
        }