In this demo, I will start with a poor man's dependency injection implementation for a Dotnet Core Console Application and make minimal changes to use Microsoft's Container to implement dependency injection.
// Poor Man's Dependency Injection
var productStockRepository = new ProductStockRepository();
IOrderManager orderManager = new OrderManager(
productStockRepository,
new PaymentProcessor(),
new ShippingProcessor(productStockRepository)
);
In order to use the Dotnet Core version of DependencyInjection,
First, we install the dependency from the nuget package.
Microsoft.Extensions.DependencyInjection
Next, add a new class ContainerBuilder and register all dependencies for your project.
using Microsoft.Extensions.DependencyInjection;
...
public class ContainerBuilder
{
public IServiceProvider Build()
{
var container = new ServiceCollection();
container.AddSingleton<IOrderManager, OrderManager>();
container.AddSingleton<IPaymentProcessor, PaymentProcessor>();
container.AddSingleton<IProductStockRepository, ProductStockRepository>();
container.AddSingleton<IShippingProcessor, ShippingProcessor>();
return container.BuildServiceProvider();
}
}
Now, update the Program class to use the ContainerBuilder to inject the dependencies
using Microsoft.Extensions.DependencyInjection;
...
public class Program
{
public static readonly IServiceProvider Container = new ContainerBuilder().Build();
public static void Main(string[] args)
{
string product = string.Empty;
var orderManager = Container.GetService<IOrderManager>();
while (product != "exit")
...
Run the application and test.
Enjoy.
the original video link here