从Controller调用SignalR Core Hub方法 [英] Call SignalR Core Hub method from Controller

问题描述

如何从Controller调用SignalR Core Hub方法?
我正在将ASP.NET Core 2.0与Microsoft.AspNetCore.SignalR(1.0.0-alpha2-final)一起使用.

How can I call SignalR Core Hub method from Controller?
I am using ASP.NET Core 2.0 with Microsoft.AspNetCore.SignalR (1.0.0-alpha2-final).

我有与Excel，SolidEdge和Excel通信的Windows服务...完成操作后，它将请求发送到ASP.NET Core应用程序中的控制器.现在，我需要通知所有与SignalR连接到服务器的客户端，外部程序已完成某些任务.
我无法更改窗口服务的工作方式. (无法从窗口服务连接到SignalR.)
我为旧的SignalR(GlobalHost.ConnectionManager.GetHubContext)找到了很多解决方案，但是发生了很多变化，这些解决方案不再起作用.

I have windows service which communicate with Excel, SolidEdge ... When operation is complete it post request to my controller in ASP.NET Core application. Now I need to inform all clients connected to server with SignalR that external program completed some task.
I can not change the way window service works. (Can not connect to SignalR from window service).
I found plenty solution for old SignalR (GlobalHost.ConnectionManager.GetHubContext), but much has changed and those solutions are not working anymore.

我的控制器:

[Route("API/vardesigncomm")]
public class VarDesignCommController : Controller
{
    [HttpPut("ProcessVarDesignCommResponse/{id}")]
    public async Task<IActionResult> ProcessVarDesignCommResponse(int id)
    {
        //call method TaskCompleted in Hub !!!! How?

        return new JsonResult(true);
    }
}

我的中心:

public class VarDesignHub : Hub
{
    public async Task TaskCompleted(int id)
    {
        await Clients.All.InvokeAsync("Completed", id);
    }
}

推荐答案

解决方案1 ​​

另一种可能性是将HubContext注入到控制器中，例如:

Another possibility is to inject your HubContext into your controller like:

public VarDesignCommController(IHubContext<VarDesignHub> hubcontext)
{
    HubContext = hubcontext;
    ...
}

private IHubContext<VarDesignHub> HubContext
{ get; set; }

那你也可以打电话

await this.HubContext.Clients.All.InvokeAsync("Completed", id);

但是随后您将在所有客户端上定向调用方法.

But then you will direct call methods on all clients.

解决方案2

您还可以使用类型化的集线器: 简单创建一个接口，您可以在其中定义服务器可以在客户端上调用的方法:

You can also work with typed hubs: Simple create an interface where you define which methods your server can call on the clients:

public interface ITypedHubClient
{
    Task BroadcastMessage(string name, string message);
}

从集线器继承:

public class ChatHub : Hub<ITypedHubClient>
{
    public void Send(string name, string message)
    {
        Clients.All.BroadcastMessage(name, message);
    }
}

将类型化的hubcontext注入到控制器中，并对其进行处理:

Inject your the typed hubcontext into your controller, and work with it:

[Route("api/demo")]
public class DemoController : Controller
{
    IHubContext<ChatHub, ITypedHubClient> _chatHubContext;
    public DemoController(IHubContext<ChatHub, ITypedHubClient> chatHubContext)
    {
        _chatHubContext = chatHubContext;
    }

    // GET: api/values
    [HttpGet]
    public IEnumerable<string> Get()
    {
        _chatHubContext.Clients.All.BroadcastMessage("test", "test");
        return new string[] { "value1", "value2" };
    }
}

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