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来自控制器.Net核心2.1的调用信号器方法

asp.net-core-signalr signalr-hub signalr asp.net-core-mvc c#

Brett Rigby · 技术社区 · 6 年前

我试图从(ASP.NET核心)MVC控制器中调用signalr Hub类中的方法,但在网上找不到演示如何调用的示例。

我需要将一个id从一个MVC操作结果直接传递到我的Hub,而不需要将id传递到页面,然后必须通过Hub获得一个客户机连接。

public class ChatHub : Hub
{ 
    public async Task DoSomething(int id)
    {            
        //// Something in here.
    }
}



public class HomeController : Controller
{
    private readonly IHubContext<ChatHub> _hubContext;

    public HomeController(IHubContext<ChatHub> hubContext)
    {
        _hubContext = hubContext;
    }

    public async Task<ActionResult> Index(int id) 
    {

         //// Call the DoSomething method from here, passing the id across.
         await _hubContext.Clients.All.SendAsync("AddToGroup", groupId);
    }
}

请问有什么办法吗(或者我是不是看错了,有没有更好的方法来达到同样的效果?)

更新:

3 回复 | 直到 6 年前

Stephen Gerard Darragh 6 年前

我认为您误解了它们是如何一起工作的(这和我昨天之前做的是一样的),hub代码是用于客户端脚本代码的回调,然后执行操作,而IHubContext则用作将发送到客户端的强类型方法

集线器

// This class is used by the JavaScript Client to call into the .net core application.
public class ChatHub : Hub<IChatClient>
{

    public static ConcurrentDictionary<string, string> Connections = new ConcurrentDictionary<string, string>();

    // As an example, On connection save the user name with a link to the client Id for later user callback
    public override Task OnConnectedAsync()
    {
        var user = Context.User.Identity.Name;

        Connections.AddOrUpdate(this.Context.ConnectionId, user, (key, oldValue) => user);

        return base.OnConnectedAsync();
    }

    public override Task OnDisconnectedAsync(Exception exception)
    {
        // Do something on disconnect.
    }

    // Add other methods you want to be able to call from JavaScript side in here...
    public void SendMessage(int id, string message)
    {
        // Message doing stuff here.
    }
}

聊天室客户端接口

// This provides strongly-typed methods that you'll have on the Client side but these don't exist on the server.
public interface IChatClient
{
    //So this method is a JS one not a .net one and will be called on the client(s)
    Task DoSomething(int id);

    Task NotificationUpdate(int id, string message);
}

public class HomeController : Controller
{
    private readonly IHubContext<ChatHub, IChatClient> _hubContext;

    public HomeController(IHubContext<ChatHub, IChatClient> hubContext)
    {
        _hubContext = hubContext;
    }

    public async Task<ActionResult> Index(int id) 
    {

         // This calls the method on the Client-side
         await _hubContext.Clients.All.DoSomething(id);
    }
}

marcusturewicz 6 年前

你可以用 IHubContext 为此:

public class HomeController : Controller
{
    private readonly IHubContext<ChatHub> _hubContext;

    public HomeController(IHubContext<ChatHub> hubContext)
    {
        _hubContext = hubContext;
    }

    public async Task<ActionResult> Index(int id) 
    {
         //// Call the DoSomething method from here, passing the id across.
         await _hubContext.Clients.All.SendAsync("DoSomething", id);
    }
}

Full docs and examples here.