How Does SignalR Enable Communication Between a .NET Server and a Console Client App?

SignalR Console App Communication

Context:

Understanding the communication mechanism between a SignalR hub (running on a .NET application server) and a client console app can be challenging. This article aims to clarify this relationship and provide a working example.

App Setup:

To facilitate communication, first install the SignalR.Host.Self package on the server application and the SignalR.Client package on the client application using NuGet.

Server Console App:

The server console application defines a custom hub named "CustomHub" with methods for sending messages and performing actions. The code initializes the SignalR server and maps the default hub URL to the server.

Client Console App:

The client console application establishes a connection to the SignalR server and creates a proxy for the "CustomHub" hub. It then invokes the "Send" method to transmit a message and registers a callback for receiving messages. Additionally, it calls the "DoSomething" method on the server to trigger an action.

Custom Hub Behavior:

The "MyHub" class serves as the hub and provides the implementation for the "Send" and "DoSomething" methods. The "Send" method returns the received message, while the "DoSomething" method invokes the "addMessage" method on all clients.

Connection and Interaction:

The client starts the SignalR connection, which triggers the establishment of a server connection. The client then sends a message to the server using the "Send" method on the hub proxy. The server receives the message and returns a response. Additionally, the client subscribes to the "addMessage" event to receive any messages sent from the server.

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