The AddIf method is used to conditionally add a service to the dependency injection container in C#. This method returns an instance of the Microsoft.Extensions.DependencyInjection.IServiceCollection interface. This interface contains all the service descriptors that are registered with the dependency injection container.
Example 1: Adding a service to the container if a condition is met
services.AddIf(condition, serviceDescriptor);
In this example, the serviceDescriptor is added to the dependency injection container if the condition is true.
Example 2: Adding a service with a factory function to the container if a condition is met
services.AddIf(condition, serviceProvider => { return new ServiceDescriptor(typeof(IService), provider => new MyService(), ServiceLifetime.Singleton); });
In this example, a new instance of the MyService class is created and added to the dependency injection container if the condition is true.
The AddIf method is part of the Microsoft.Extensions.DependencyInjection.Abstractions package library.
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