SignalR客戶端服務依賴項注入

Question

我已經實現了Microsoft.AspNetCore.SignalR.Client作為服務。 我可以成功注入它並將消息發送到中心。 但是我無法弄清楚如何從該特定類監聽集線器（接收消息）。

我可以通過OnBroadcast操作在HubClient接收消息。

public class HubClient : IHub
{
    private HubConnection hubConnection;

    private async Task ConnectAsync()
    {
        // Connect

        hubConnection.On<string>("Broadcast", OnBroadcast); 
    }

    public async Task Send(string message)
    {
        await hubConnection.SendAsync("method", message);
    }

    private void OnBroadcast(string message)
    {
        // Received message
    }
}

如何接收和處理MyClass消息？ 如何使OnBroadcast(string message)在MyClass工作，以便可以對消息執行某些操作？ 我有多個類，每個類都必須處理來自中心的消息。

public class MyClass
{
    private readonly IHub hub;

    public MyClass(IHub hub)
    {
        this.hub = hub;
    }

    public Task Send(string message)
    {
        // Sending message to the hub works
        await hub.Send(message);
    }

    // How can I process received messages here?
}

Answer 1

public interface IHub
{
    Task Send(string data);

    event Action<string> OnBroadcastAction;
}

public class HubClient : IHub
{
    private HubConnection hubConnection;

    public event Action<string> OnBroadcastAction;

    private async Task ConnectAsync()
    {
        // Connect

        hubConnection.On<string>("Broadcast", OnBroadcast);
    }

    public async Task Send(string message)
    {
        await hubConnection.SendAsync("method", message);
    }

    private void OnBroadcast(string message)
    {
        OnBroadcastAction?.Invoke(message);
    }
}

public class MyClass
{
    private readonly IHub hub;

    public MyClass(IHub hub)
    {
        this.hub = hub;
        hub.OnBroadcastAction += OnBroadcast;
    }

    public Task Send(string message)
    {
        await hub.Send(message);
    }

    private void OnBroadcast(string message)
    {
        Console.WriteLine(message);
    }
}