CODEWITHSUNDEEP
c#asp.net-coredependency-injectionasp.net-core-webapisignalr-hub
FireShock
FireShock

Reputation: 1122

How to get SignalR IHubContext from DI in .NET Core 3.1?

I have many Hubs and register them:

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
    endpoints.MapHub<FinanceHub>("/hub/finance");
    endpoints.MapHub<PartnersHub>("/hub/partners");
    ...
    endpoints.MapHub<WarehousesHub>("/hub/warehouses");
    endpoints.MapControllerRoute("default", "{controller}/{action}/{id?}");
});

I register SignalR:

services.AddSignalR(options =>
{
    options.EnableDetailedErrors = true;
    options.MaximumReceiveMessageSize = signalrMaxMessageLimit * 8192;
}).AddMessagePackProtocol(conf =>
{
    conf.FormatterResolvers.Clear();
    conf.FormatterResolvers.Add(CircularResolver.Instance);
});

They work as SignalR hubs. But when I try to resolve them in Microsoft.AspNetCore.Mvc.ControllerBase:

private IHubContext<FinanceHub> financeHub => provider.GetRequiredService<IHubContext<FinanceHub>>();

public PaymentRegisterController(
    ILogger<ServiceController> logger,
    IServiceProvider _provider) : base(logger)
{
    provider = _provider;
}

I get an exception:

System.InvalidOperationException: No service for type 'Microsoft.AspNet.SignalR.IHubContext`1[Engy.Plantain.Procurement.Backend.Hubs.FinanceHub]' has been registered.

Where is the problem?

Upvotes: 4

Views: 1804

Answers (2)

Wowo Ot
Wowo Ot

Reputation: 1529

I think the new way to do it in .NET 6

You can have multiple Resolvers

services.AddSignalR()
.AddMessagePackProtocol(options =>
{
    options.SerializerOptions = MessagePackSerializerOptions.Standard
   .WithResolver(MessagePack.Resolvers.StandardResolver.Instance)
.WithResolver(MessagePack.Resolvers.NativeDateTimeResolver.Instance)
    .WithSecurity(MessagePackSecurity.UntrustedData);
});

Upvotes: 0

FireShock
FireShock

Reputation: 1122

As eveyone, I am sure, thought, it was my mistake. In the API-controller I was trying to resolve Microsoft.AspNet.SignalR.IHubContext instead of Microsoft.AspNetCore.SignalR.IHubContext. Now everything works perfectly.

Upvotes: 1

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