C#•2y ago

ServiceProvider not providing registered service [Answered]

For some reason, despite registering this api wrapper as so:

services.TryAddScoped<IInContactRestAPI>
(
    serviceProvider => new InContactRestAPI
    (
        serviceProvider.GetRequiredService<IRestHttpClient>(),
        serviceProvider.GetRequiredService<IOptionsMonitor<JsonSerializerOptions>>().Get(InContact),
        serviceProvider.GetRequiredService<IOptions<InContactConfig>>(),
        serviceProvider.GetRequiredService<ITokenStore>()
    )
);

services.TryAddScoped<IInContactRestAPI>
(
    serviceProvider => new InContactRestAPI
    (
        serviceProvider.GetRequiredService<IRestHttpClient>(),
        serviceProvider.GetRequiredService<IOptionsMonitor<JsonSerializerOptions>>().Get(InContact),
        serviceProvider.GetRequiredService<IOptions<InContactConfig>>(),
        serviceProvider.GetRequiredService<ITokenStore>()
    )
);

Attempting to retrieve it from the service provider results in an InvalidOperationException because the type is not in the service provider. This happens whether I request the interface or the concrete implementation. Rider does in fact confirm that the scoped rest api wrapper is present in the service collection when stepping through.

12 Replies

Foxtrek_64•2y ago

In the screeshotted sample above, I changed GetRequiredService() to GetService() to avoid the throw since I'm using a result mechanism, but as you can see it hits the return Result.FromError() line because the returned service instance is null.

Tvde1•2y ago

how are you retrieving it from the service provider? you are retrieving the IInContactRestAPI, right? be sure to create a scope

Foxtrek_64•2y ago

var restApi = serviceProvider.GetService<IInContactRestAPI>();
if (restApi is null)
{
    return Result.FromError
        (new InvalidOperationError($"Unable to retrieve an instance of {nameof(InContactRestAPI)}"));
}

var restApi = serviceProvider.GetService<IInContactRestAPI>();
if (restApi is null)
{
    return Result.FromError
        (new InvalidOperationError($"Unable to retrieve an instance of {nameof(InContactRestAPI)}"));
}

You know what, that might be it entirely. I don't know if the plugin service creates a scope per plugin

Tvde1•2y ago

you need to do

using var scope = serviceProvider.CreateScope();
var restApi = scope.ServiceProvider.GetService<IInContactRestAPI>();

using var scope = serviceProvider.CreateScope();
var restApi = scope.ServiceProvider.GetService<IInContactRestAPI>();

typed that without intellisense so I don't know if it's correct

Foxtrek_64•2y ago

Looks like it's happy now

Tvde1•2y ago

😁

Foxtrek_64•2y ago

await using var serviceScope = serviceProvider.CreateAsyncScope();
var restApi = serviceScope.ServiceProvider.GetService<IInContactRestAPI>();
if (restApi is null)
{
    return Result.FromError
        (new InvalidOperationError($"Unable to retrieve an instance of {nameof(InContactRestAPI)}"));
}

await using var serviceScope = serviceProvider.CreateAsyncScope();
var restApi = serviceScope.ServiceProvider.GetService<IInContactRestAPI>();
if (restApi is null)
{
    return Result.FromError
        (new InvalidOperationError($"Unable to retrieve an instance of {nameof(InContactRestAPI)}"));
}

Tvde1•2y ago

async scope, fancy

Foxtrek_64•2y ago

I'll add that as an issue to the plugin library I think. Plugins should have their own scopes.

Tvde1•2y ago

You can /close it if it all works ^^

Accord•2y ago

✅ This post has been marked as answered!

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ServiceProvider not providing registered service [Answered]