BlazorServerPushSignalr

BlazorServerPushSignalr

Sample of how to use Blazor + SignalR tech (C# Net 5.0). Mainly how to have a static object to use in any place server side in order to push signalR notification to connected clients.

Solution based on:

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https://newbedev.com/how-to-get-signalr-hub-context-in-a-asp-net-core

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https://stackoverflow.com/questions/51968201/invoking-signalr-hub-not-working-for-asp-net-core-web-api/51981886#51981886

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I assume you know how Blazor app is basically structured

Main Points to focalize on:

• Startup.cs
• Hubs/SignalrHub0.cs
• Pages/Index.razor
• Controllers/IndexController.cs
• Statics/SignalrServerSide.cs

Basic Idea:

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You have your Index.razor (layout only) Index.razor is controlled by IndexController.cs

Basic Workflow

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In Startup.cs you will map your Hub (SignalrHub0.cs) on certain endpoint.

Backend of startup will automatically call constructor of SignalrHub0.cs with needed data.

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You will also need to define a Hosted Service (SignalrServerSide.cs) which we will use later as main endpoint to access HubClients at any point directly from backend.

Again, Startup.cs backend will keep updated static variable in SignalrServerSide.cs with its strange logics.

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Now all you need to do to get all currently connected clients at any point on server side:

SignalrServerSide.HubContext

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If you wish to recycle logics you already defined in SignalrHub0.cs

Thanks to its constructor you can simply do this:

_ = new SignalrHub0(SignalrServerSide.HubContext).SendMessageAsync("MyRecycledMessage");