在SignalR传递强类型集线器 [英] Passing strongly typed Hubs in SignalR

问题描述

我刚刚更新了一些SignalR引用和事情，以允许一般类型的集线器集线器和LT有所改变; T＆GT; 。在现有的实例和文档，如在：

I've just updated some SignalR references and things have changed somewhat in order to allow for generically typed Hubs Hub<T>. In the existing examples and documentation such as at:

<一个href=\"http://www.asp.net/signalr/overview/signalr-20/getting-started-with-signalr-20/tutorial-server-broadcast-with-signalr-20\">Server-Broadcast-with-Signalr

我们有一个静态类通过以下机制保持对客户的引用：

we have a static class holding references to clients via the following mechanisms:

public class StockTicker()
{
private readonly static Lazy<StockTicker> _instance = new Lazy<StockTicker>(
            () => new StockTicker(GlobalHost.ConnectionManager.GetHubContext<StockTickerHub>().Clients));

 IHubConnectionContext Clients {get;set;}

 private StockTicker(IHubConnectionContext clients)
        {
            Clients = clients;
        }
}

因此​​，一个静态引用检查，如果为null，伸出手来：

So a static reference is checked and if null it reaches out to :

GlobalHost.ConnectionManager.GetHubContext<StockTickerHub>().Clients

要创建一个实例，通过构造提供的客户端。

to create an instance and supply the clients via the constructor.

的因此，这是它如何用来工作的确实是上面的网址怎么有它。但现在集线器＆LT; T＆GT; 有一个在构造函数中所需略有变化：

So this was how it used to work and indeed is how the url above has it. But now with Hub<T> there is a slight change required in the constructor:

 private StockTicker(IHubConnectionContext<dynamic> clients)
 {
   Clients = clients;
 }

现在我的问题是如何延长这进一步使得我StockTicker版本可以对X型的客户一个强类型属性。

Now my question is how can I extend this further such that my version of StockTicker can have a strongly typed property for clients of type x.

 IHubConnectionContext<StockTickerHub> Clients {get;set;}

 private StockTicker(IHubConnectionContext<dynamic> clients)
 {
   Clients = clients; // Fails, wont compile
 }

通过保持强类型的引用，我将能够调用强类型的方法等。

By maintaining strongly typed references I would be able to call strongly typed methods, etc.

推荐答案

现在有GetHubContext的新重载需要两个泛型参数。首先是枢纽型像以前一样，但第二个泛型参数是TClient。（这是T在集线器＆LT; T＆GT; ）

There is now a new overload of GetHubContext that takes two generic parameters. The first is the Hub type like before, but the second generic parameter is TClient (which is the T in Hub<T>).

假设StockTickerHub定义如下：

Assuming that StockTickerHub is defined as follows:

public class TypedDemoHub : Hub<IClient>

然后

GlobalHost.ConnectionManager.GetHubContext<StockTickerHub>().Clients

变为

GlobalHost.ConnectionManager.GetHubContext<StockTickerHub, IClient>().Clients

由新的过载GetHubContext返回的类型将是 IHubContext＆LT; IClient＆GT; 和客户属性将被 IHubConnectionContext＆LT; IClient＆GT; ，而不是 IHubConnectionContext＆LT;动态＆GT; 或 IHubConnectionContext＆LT; StockTickerHub方式＆gt;

The type returned by the new overload to GetHubContext would be IHubContext<IClient> and the Clients property would be IHubConnectionContext<IClient> instead of IHubConnectionContext<dynamic> or IHubConnectionContext<StockTickerHub>.

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