Asp.net Real-Time Application

  Using Hubs SignalR's main goal is to deliver a real-time experience over HTTP, where both clients and servers can participate in a conversation as senders and listeners at the same time (known as full-duplex communication). A client initiates the flow by starting a new connection, but after that, both types of actors are equally capable of sending and receiving bits of the conversation. In order to deliver such an experience, SignalR comes with two distinct APIs: one called persistent connection, which we can consider to be the low-level API, and one called Hubs, which is built on top of the former and brings a higher-level set of concepts and an easier and straightforward experience for the developer. We'll talk about Hubs first as we want to make our way through the SignalR features, starting from the simplest to use to the more sophisticated. A Hub can be seen as a set of methods exposed by a server that any client can connect to, in order to perform actions on that server...

Chapter 2: Hub SignalR uses hubs to communicate between clients and servers. A hub is a high-level pipeline that allows a client and server to call methods on each other. SignalR handles the dispatching across machine boundaries automatically, allowing clients to call methods on the server and vice versa. You can pass strongly-typed parameters to methods, which enables model binding. SignalR provides two built-in hub protocols: a text protocol based on JSON and a binary protocol based on MessagePack. MessagePack generally creates smaller messages compared to JSON. Older browsers must support XHR level 2 to provide MessagePack protocol support. Hubs call client-side code by sending messages that contain the name and parameters of the client-side method. Objects sent as method parameters are deserialized using the configured protocol. The client tries to match the name to a method in the client-side code. When the client finds a match, it calls the method and passes to it the dese...

Chapter 1: Introduction SignalR is an amazing framework that delivers a real-time and bidirectional messaging platform. SignalR provides several options to reach its goal.  A Hub is a special class that SignalR will expose to all the connected clients, allowing them to make Remote Procedure Calls (RPC) to it. Inside the Hub, the developer will also have a set of special objects to use in order to perform calls back onto the connected clients. There is a very important detail to highlight: SignalR is composed of a server-side library and a set of client-side libraries. In every working solution, you will always need to use both; you will need to expose the server-side endpoints and connect to them using the most appropriate client library. SignalR will do the rest, and you will experience a very natural, simple, and bidirectional programming model. Good candidates for SignalR:   Apps that require high frequency updates from the server. Examples are gami...