Announcing SteemWhistle: A library that lets you stream and query the Steem blockchain using LINQ and Rx.

I've just checked in the really early bits for SteemWhistle, which includes a rudimentary vote bot as a sample.
All you need is to clone https://github.com/Auxon/SteemWhistle to get started.

The SteemVoteBot is a simple bot that demonstrates the use of the library, so take a look at it and let me know what you think!

Here's a sample of the code you can write:

        var globalPropertiesObservable = GlobalPropertiesObservable.Create("ws://localhost:8090").Publish();
        var blockObservable = BlockObservable.Create("ws://localhost:8090", globalPropertiesObservable).Publish();
        var transactionsObservable = TransactionsObservable.Create(blockObservable).Publish();
        var postsAndCommentsObservable = PostsAndCommentsObservable.Create(transactionsObservable).Publish();
        var commentsObservable = CommentsObservable.Create(postsAndCommentsObservable).Publish();
        var postsObservable = PostsObservable.Create(postsAndCommentsObservable).Publish();
        var votesObservable = VotesObservable.Create(transactionsObservable).Publish();

        globalPropertiesObservable.Connect();
        blockObservable.Connect();
        transactionsObservable.Connect();
        postsAndCommentsObservable.Connect();
        commentsObservable.Connect();
        postsObservable.Connect();
        votesObservable.Connect();

        globalPropertiesObservable.Subscribe((globalProperties) =>
        {
            Console.WriteLine("head_block_number = " + globalProperties.head_block_number);
        }, (ex) => Console.WriteLine(ex.Message));

        blockObservable.Subscribe(block =>
        {
            Console.WriteLine("Block arrived.  # of transactions = " + block.transactions?.Count());
        }, (ex) => Console.WriteLine(ex.Message));

        var q = from block in blockObservable
                from transaction in block.transactions
                select transaction.signatures;

Many thanks to @xeroc, @theoretical, and others for posting their code that helped me figure out what to do.