Using third-party containers

Though the built-in container is sufficient for most of our scenarios, .NET 5 provides a way to integrate with third-party containers that can be leveraged if need be.

Let's have a closer look at how the framework wires up the services. When the Startup class is registered with HostBuilder in Program.cs, .NET framework uses reflection to identify and call the Configure and ConfigureServices methods.

Here is a snippet from the StartupLoader class in ASP.NET Core 5:

var configureMethod = FindConfigureDelegate(startupType, environmentName);
var servicesMethod = FindConfigureServicesDelegate(startupType, environmentName);
var configureContainerMethod = FindConfigureContainerDelegate(startupType, environmentName);

From the preceding code, we can see that the first two methods, FindConfigureDelegate and FindConfigureServicesDelegate, are to find the Configure and ConfigureServices methods.

The last line is for ConfigureContainer. We can define...