CODEWITHSUNDEEP
signalr
Ben Foster
Ben Foster

Reputation: 34830

How to invoke SignalR hub operations from the server

The SignalR wiki covers how to broadcast over a hub from outside of a hub. However, this calls the client side operation:

var context = GlobalHost.ConnectionManager.GetHubContext<MyHub>();
context.Clients.Group(group).addMessage(message);

Is there a way to invoke the Hub Operation, ideally in a strongly typed way? e.g.

GetHubContext<MyHub>().Invoke(h => h.Say(message))

I know this is possible by connecting to the hub using the .NET client but this seems wrong for when the calling code is on the same server as the hub.

Upvotes: 3

Views: 2629

Answers (3)

Jon Egerton
Jon Egerton

Reputation: 41579

Bit late to the party but, yes, there is.

The stockticker sample nuget package does this (although it doesn't entirely use it!):

Basically, you expose a static instance of the server side hub to make calls against.

In the sample the pattern is:

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

...


    public static StockTicker Instance
    {
        get
        {
            return _instance.Value;
        }
    }

...

This is then available to be called from anywhere and pretty much anywhen!:

StockTicker.Instance.OpenMarket();

The same example is also covered by a blog post at the asp.net site

Upvotes: 5

purplesoft
purplesoft

Reputation: 526

Take a look: https://github.com/i-e-b/SignalR-TypeSafeClient

you can use this library.

Tiz

Upvotes: 0

davidfowl
davidfowl

Reputation: 38864

Nope. That's like trying to invoke an MVC controller from the server side (you just don't do it). Just move the common logic into a shared helper and call that helper from both the hub and your other server side code.

Upvotes: 1

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