tallybot-messages-post.cs

public Message Post([FromBody]Message message)
{
    if (message.Type == "Message")
    {
        // calculate something for us to return
        int length = (message.Text ?? string.Empty).Length;

        // return our reply to the user
        return message.CreateReplyMessage($"Hello from TallyBot! You sent {length} characters");
    }
    else
    {
        return HandleSystemMessage(message);
    }
}