Open.SignalR.SharedClient

A scoped hub connection and provider for easily sharing SignalR connections.

IScopedHubConnection

Provides all the same functionality as a HubConnection, but does not interfere with other IScopedHubConnection instances.

Disposing the scoped connection cleans up all the handlers but leaves the connection intact for others to use.

Usage

DI Setup

Default

Assumes the consumers will know which URL to ask for.

services.AddScopedHubConnectionProvider();

Consumers use .GetConnectionFor(url) to get a hub connection.

With Named Connections

Allows for any hub configuration to be added and retrieved by name.

Note: Client/Server hybrid apps will need to replicate the DI setup on the server side.

services.AddScopedHubConnectionProvider(serviceProvider => {
	var nav = serviceProvider.GetRequiredService<NavigationManager>();
	return [
		// Hub 1
		KeyValuePair.Create("hub1",
			new HubConnectionBuilder()
			.WithAutomaticReconnect()
			.WithUrl(nav.ToAbsoluteUri("/hubs/hub1"))),

		// Hub 2
		KeyValuePair.Create("hub2",
			new HubConnectionBuilder()
			.WithUrl(nav.ToAbsoluteUri("/hubs/hub2")))
	];
});

Consumers use .GetGonnectionByName(hubName) to get a hub connection.

Example

public class MyService : IDisposable
{
	private readonly IScopedHubConnection _hub;
	public MyService(IScopedHubConnectionProvider connectionProvider)
	{
		_hub = connectionProvider.GetConnectionByNam("hub1");

		_hub.On("MyMethod1", (string arg1, string arg2) =>
		{
			// Do something when the method is invoked on the hub.
		});

		_hub.On("MyMethod2", (string arg1, string arg2) =>
		{
			// Do something when the method is invoked on the hub.
		});

		// Automatically invokes OnConnectionEstablished when a connnection is available
		// and invokes it on every reconnection.
		_hub.OnConnected(OnConnectionEstablished);
	}

	public void Dispose() => _hub.Dispose();

	static void OnConnectionEstablished(IScopedHubConnection hub)
	{
		hub.SendAsync("SubTo", "MyMethod1");
		hub.SendAsync("SubTo", "MyMethod2");
	}

	public async Task DoSomething()
	{
		// Automatically guarantees a connection and invokes the method.
		await _hub.InvokeAsync("MyMethod", "arg1", "arg2");
	}
}