SignalR - реализация реального времени в .NET — Вариант A — Использование `HubConnection` напрямую

@page "/chat"
@using Microsoft.AspNetCore.SignalR.Client

<ul>
@foreach (var msg in messages) { <li>@msg</li> }
</ul>

@code {
    private HubConnection? connection;
    private List<string> messages = new();

    protected override async Task OnInitializedAsync()
    {
        connection = new HubConnectionBuilder()
            .WithUrl(NavigationManager.ToAbsoluteUri("/chathub"))
            .Build();

        connection.On<string, string>("ReceiveMessage", (user, message) =>
        {
            messages.Add($"{user}: {message}");
            InvokeAsync(StateHasChanged);
        });

        await connection.StartAsync();
    }

    public async ValueTask DisposeAsync()
    {
        if (connection is not null)
        {
            await connection.DisposeAsync();
        }
    }
}