TryDecorate not working as expected.

[lukister]

If in DI TryAddScoped do not add service to collection if it's already there, then expected behavior for TryDecorate should be the same. But it not passing this test:

public class TestTest
{
    public interface IExampleInterface { }

    public class ExampleImplementation : IExampleInterface { }

    public class ExampleDecorator(IExampleInterface impelmentation) : IExampleInterface { public IExampleInterface Implementation { get; set; } = impelmentation; }

    [Fact]
    public void TestTryDecorate()
    {
        var serviceCollection = new ServiceCollection();
        serviceCollection.AddScoped<IExampleInterface, ExampleImplementation>();
        serviceCollection.TryDecorate(typeof(IExampleInterface), typeof(ExampleDecorator));
        var initCount = serviceCollection.Count;

        serviceCollection.TryDecorate(typeof(IExampleInterface), typeof(ExampleDecorator));
        serviceCollection.TryDecorate(typeof(IExampleInterface), typeof(ExampleDecorator));

        var obj = serviceCollection.BuildServiceProvider()
            .GetRequiredService<IExampleInterface>();

        obj.Should().BeOfType<ExampleDecorator>();

        var obj2 = obj as ExampleDecorator;

        obj2!.Implementation.Should().BeOfType<ExampleImplementation>();
    }
}

[khellang]

TryAdd* and TryDecorate are two different things. It works exactly as expected. TryDecorate will (re)decorate everything every time it's called and return true. If nothing is found, it returns false.