Connection IDs - SignalR Connection Management

Syntax

public string ConnectionId { get; }

Example

public async Task SendMessage(string message)
{
    string connectionId = Context.ConnectionId; 
    await Clients.Client(connectionId).SendAsync("ReceiveMessage", message);
}

Output

Connecting clients to a SignalR hub requires a unique identifier known as a connection ID. Connection IDs help in routing messages to specific clients or groups of clients.

Explanation

SignalR Connection Management enables a server-side code to involve clients with push notifications (real-time notifications). SignalR creates a connection between a server and a client that remains open to enable real-time communication to take place between them.

The ConnectionId property is a unique identifier that is assigned to each client when they connect to the SignalR hub. This unique identifier is used to communicate with individual clients, either directly or by grouping together to form a group of connections.

Use

You can use ConnectionIds in SignalR to send messages from the server to specific clients or groups of clients. These messages can be used to update the user interface and/or trigger different events on the client side.

For example, you can use SignalR to notify users when new content has arrived on the server-side, or to alert them to new chat messages or comments.

Important Points

• Connection IDs are unique identifiers assigned to each client when they connect to a SignalR hub.
• Connection IDs can be used to send messages directly to individual clients or to group together to form a group of connections.
• When a client disconnects from a SignalR hub and reconnects again, a new connection ID is generated.

Summary

In summary, Connection IDs are crucial in SignalR Connection Management. They help to uniquely identify each client connecting to the hub and make it easy to route messages to specific clients or groups of clients. Connection IDs play a major role in real-time communication between clients and the server, enabling developers to produce real-time notifications, updates, and events.