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Dependency Injection ASP.NET Core: Registering a single implementation as multiple services

Arti answered on November 25, 2022 Popularity 2/10 Helpfulness 1/10

answer Dependency Injection ASP.NET Core: Registering a single implementation as multiple services

Dependency Injection ASP.NET Core: Registering a single implementation as multiple services

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public interface IBar {}
public interface IFoo {}

public class Foo : IFoo, IBar {}

[Fact]
public void WhenRegisteredAsSeparateSingleton_InstancesAreNotTheSame()
{
    var services = new ServiceCollection();

    services.AddSingleton<IFoo, Foo>();
    services.AddSingleton<IBar, Foo>();

    var provider = services.BuildServiceProvider();

    var foo1 = provider.GetService<IFoo>(); // An instance of Foo
    var foo2 = provider.GetService<IBar>(); // An instance of Foo

    Assert.Same(foo1, foo2); // FAILS
}

Popularity 2/10 Helpfulness 1/10 Language csharp

Source: andrewlock.net

Tags: c# dependency-injection implementation registering

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