What is the guideline for using Autofac with CommunityToolkit.Mvvm?

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There is no specific guideline for using Autofac with CommunityToolkit.Mvvm, as both are independent tools that can be used together without any conflicts. However, here are some general steps that you can follow to use Autofac for dependency injection with CommunityToolkit.Mvvm:

1. Add Autofac to your project using NuGet: Install-Package Autofac
2. Define the services that you want to inject as interfaces and their implementations as classes.
3. Register these implementations with Autofac using the ContainerBuilder, for example:

var builder = new ContainerBuilder();
builder.RegisterType<MyService>().As<IMyService>();
builder.RegisterType<MyViewModel>().AsSelf();

1. Build the container using builder.Build() and store it in a field or property.
2. Override the OnInitialize method of your ViewModelBase-derived class to resolve the services from the container, for example:

protected override void OnInitialize()
{
    base.OnInitialize();

    var myService = _container.Resolve<IMyService>();
    var myViewModel = _container.Resolve<MyViewModel>();
}

1. Use the resolved services and view models in your own code as needed.

Note that this is just a simple example, and you may need to adapt it to your specific requirements. Also note that Autofac provides many advanced features for configuring dependency injection, such as lifetime scoping and property injection, that you can explore as needed.