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Microsoft.Extensions.DependencyInjection - Check if a service is registered in the DI container

After using other DI containers like Microsoft Unity, StructureMap and Autofac, I'm now using the built-in Microsoft.Extensions.DependencyInjection DI container most of the time.  The default DI container lacks some more advanced features that these other containers have, but for most use cases it is sufficient.

This week I was looking at a way to check if a specific service was registered in the DI container without resolving and constructing the service instance. Turns out that this feature was introduced in .NET 6 through the IServiceProviderIsService interface (what’s in a name).

This interface provides a single method that you can invoke to check whether a given service type is registered in the DI container. To use it, you can resolve the IServiceProviderIsService service itself from the container and call the IsService method:

Nice!

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