Streaming deserialization and emitting event when specific key + value is found?

[sibbl]

Hi,

I'm downloading a yaml from a HTTP request and would like to deserialize it e.g. line by line. As soon as a specific key was sent, I'd like to trigger something, while the rest of the deserialization should continue.

What's the best approach for this?

I thought of:

1. Build my own TextReader to provide the samples (and block until Wait can return more bytes) to a YamlStream instance
2. Implement my own deserializer (similar to the new TypeDiscriminatingNodeDeserializer) which triggers an event when the necessary scalar was found.

Is there anything better which requires less development? Like having access to an emitter somewhere though the deserialization process?

Thanks in advance for any help or pointer to existing code!