FieldInjectionScenario.cs

/*
$v=true
$p=9
$d=Field injection
$h=To use dependency injection for a field, make sure the field is writable and simply add the _Ordinal_ attribute to that field, specifying an ordinal that will be used to determine the injection order:
*/

// ReSharper disable ClassNeverInstantiated.Local
// ReSharper disable CheckNamespace
// ReSharper disable UnusedParameter.Local
// ReSharper disable ArrangeTypeModifiers

namespace Pure.DI.UsageTests.Basics.FieldInjectionScenario;

using Shouldly;
using Xunit;

// {
interface IDependency;

class Dependency : IDependency;

interface IService
{
    IDependency? Dependency { get; }
}

class Service : IService
{
    // The Ordinal attribute specifies to perform an injection,
    // the integer value in the argument specifies
    // the ordinal of injection
    [Ordinal(0)] internal IDependency? DependencyVal;

    public IDependency? Dependency => DependencyVal;
}
// }

public class Scenario
{
    [Fact]
    public void Run()
    {
        // Resolve = Off
// {
        DI.Setup(nameof(Composition))
            .Bind<IDependency>().To<Dependency>()
            .Bind<IService>().To<Service>()

            // Composition root
            .Root<IService>("MyService");

        var composition = new Composition();
        var service = composition.MyService;
        service.Dependency.ShouldBeOfType<Dependency>();
// }
        composition.SaveClassDiagram();
    }
}