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Why the entry point can grow—and what not to register again
ASP.NET Core applications commonly add framework services through host and app-builder patterns. Microsoft notes that .NET templates may register hundreds of services, so a long service collection does not necessarily mean your application has redundant registrations. Add only the framework or application services your application needs; do not copy framework defaults into your own setup without a reason.
For application-owned services, the goal is not to hide every registration. It is to give related registrations a clear owner so Program.cs shows the application’s composition at a useful level.
Use a feature-oriented extension method first
Microsoft’s documented convention is to use one Add{GROUP_NAME} extension method to register the services required by a related feature. The framework itself uses names such as AddOptions. For an application, names like AddPayments, AddApplicationServices, or AddInfrastructure are more informative than a generic AddServices.
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For example, a project that owns order-application services can expose an extension method:
using Microsoft.Extensions.DependencyInjection;
namespace MyApp.Application;
public static class DependencyInjection
{
public static IServiceCollection AddApplicationServices(
this IServiceCollection services)
{
services.AddScoped<IOrderService, OrderService>();
services.AddScoped<IOrderValidator, OrderValidator>();
return services;
}
}The application entry point then describes the major registration groups rather than listing every implementation:
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var builder = WebApplication.CreateBuilder(args);
builder.Services
.AddApplicationServices()
.AddInfrastructure(builder.Configuration);Place each extension method with the project or layer that owns the registrations. The calling project must reference that project, and the extension-method namespace must be in scope. This keeps ownership understandable without requiring a separate registration for every service in the entry point.
When explicit registrations are the better choice
For a small application or a handful of irregular services, direct calls in Program.cs are often clearest. Explicit mappings show exactly which interface resolves to which implementation. An extension method helps when a cohesive group would otherwise make the entry point noisy; it is not a reason to create an abstraction for every single line.
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Choose the approach that keeps registrations predictable
| Approach | Best fit | Visibility and mapping control | Main trade-off |
|---|---|---|---|
Explicit registrations in Program.cs |
Small applications or a small number of services | Highest visibility; each service-to-implementation mapping is stated directly. | The entry point grows as registrations accumulate. |
| Feature or project extension methods | Most applications with registrations that belong together | Mappings remain explicit inside a named group, while the entry point stays concise. | Readers may need to open the extension method to inspect the full registration set. |
| Scrutor assembly scanning | Larger sets that follow a stable naming or interface convention | Less repetitive mapping code, but the scan rules determine which types become services. | Broad or unclear filters make the container’s contents harder to predict. |
Prefer explicit feature groups for ordinary application code. Consider scanning only when repeated mappings follow a convention that can be stated narrowly and reviewed as the codebase changes.
Use Scrutor when a stable convention makes scanning worthwhile
Scrutor adds assembly scanning and decoration capabilities to Microsoft.Extensions.DependencyInjection. Its scanning API can select assemblies, filter classes, map them to implemented interfaces or selected service types, and assign lifetimes. The package listing identifies Scrutor 7.0.0; check the NuGet package page for current target frameworks and compatibility before choosing a version.
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A scan should answer three questions clearly: which assembly is searched, which concrete classes qualify, and which service type and lifetime each qualifying class receives. For example, a convention that maps repository implementations to their interfaces can be expressed with filters rather than scanning every type in every loaded assembly:
using Scrutor;
builder.Services.Scan(scan => scan
.FromAssemblyOf<OrderRepository>()
.AddClasses(classes => classes.AssignableTo<IRepositoryMarker>())
.AsImplementedInterfaces()
.WithScopedLifetime());This example assumes the application has a marker interface and repository types that follow that convention. Adapt the assembly selector, class filter, service mapping, and lifetime to the actual codebase. A broad scan can accidentally register types that were not intended for dependency injection, or expose mappings that are less obvious than explicit calls. Scrutor is an option, not an ASP.NET Core requirement.
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Understand duplicate registrations before trying to remove them
Multiple registrations for the same service type are not automatically redundant. With ordinary registrations, resolving a single service returns the last registration; resolving IEnumerable<T> returns the registered services in order. That distinction matters when reviewing a repeated line: it may intentionally replace a default or contribute another handler to a collection.
- Use
TryAdd{Lifetime}, such asTryAddScoped, when a reusable library should supply a default only if the consumer has not registered that service. - Use
TryAddEnumerablewhen distinct implementations should accumulate but the same implementation should not be added twice. - Use ordinary
Add{Lifetime}registrations when replacement or multiple registrations are intentional, and make that intent apparent in the registration group.
These methods address different behaviors; substituting one for another can change what the container resolves.
Keep service lifetimes visible and appropriate
Grouping registrations does not make lifetime choice less important. In web applications, a scoped service is created per request. Entity Framework Core’s AddDbContext registers a context as scoped by default. A singleton is shared and must be thread-safe; it should not directly capture a scoped service.
- Scoped: appropriate for services whose instance should be shared during a web request, including the usual
DbContextregistration. - Singleton: shared across requests, so its state and dependencies must be safe for concurrent use. Do not choose it merely to make registrations simpler.
- Scoped work from a singleton: when needed, create an explicit scope through
IServiceScopeFactoryinstead of injecting a scoped dependency directly.
For more detail on registration semantics, defaults, and lifetime behavior, see Microsoft’s service registration guidance and service lifetime guidance.
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