ASPNET SignalR Deep Dive — Real-Time Communication in .NET

public class ScanHub : Hub
{
    private readonly IScanService _scanService;
    public ScanHub(IScanService scanService) => _scanService = scanService;

    public async Task StartScan(string fileId)
    {
        var groupName = $"scan-{fileId}";
        await Groups.AddToGroupAsync(Context.ConnectionId, groupName);
        await Clients.Group(groupName).SendAsync("ScanStarted", fileId);
        var result = await _scanService.ScanAsync(fileId);
        await Clients.Group(groupName).SendAsync("ScanCompleted", fileId, result);
    }

    public async Task StreamProgress(string fileId)
    {
        await foreach (var progress in _scanService.StreamProgressAsync(fileId))
        {
            await Clients.Caller.SendAsync("ProgressUpdate", progress);
        }
    }
}