How to use dependency injection on asp.net core: patterns, errors and tips

Injection of dependence on asp.net core is the main architectural principle that exceeds mere code organizations. This increases testability, facilitates maintenance and supports the separation of clean responsibilities.

But that can quickly become a source of bugs and performance problems.

In this article we illuminate practical patterns, sources of error and performance tips that are often around the injection of dependency in Asp.net Core-Pasti for companies that develop software solutions that can be discussed and waiting.

🔍 What is the injection of Ist dependence on Asp.net core?

Injection of dependency (DI) means that a class does not create its own dependence, but this is from Of Container on Asp.net Core provided.

Asp.net Core offers an integrated and performing framework that supports all general requirements.

Example code:

CSHARP

Copyedit

IemailService public interface
{
Cancel send (string to, subject string, body string);
}

Smtpemailservice public class: IemailService
{
Public Void Send (String to, Subject String, Body String)
{
// Delivery logic
}
}

Public class notice: controller
{
Private Readyly IemailService _emailService;

Publiccontroller Notification (IEMAILService EmailService)
{
_EmailService = EmailService;
}

Public IACTHESTESULT NOTIFY ()
{
_emailService.send (“[email protected]”, “subject”, “message”);
back ok ();
}
}

🔄 Life cycle in a container at asp.net core

Choosing the right life cycle is very important for stability and performance.

• Temporary: New example with each request.

• Scoped: Instance per request http.

• Singleton: Examples in all applications.

Example:

CSHARP

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Services.addtransient ();
Services.addscoped ();
Services.addsingleton ();

⚠️ Important: Avoid using scope services in the Sington-Component Sington-This often leads to Runtime errors (exceptions to disability operations).

🧠 Continued patterns for the core application asp.net

1. Factory -Based Registration

Ideal for complex initialization:

CSHARP

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Services.addscoped (Provider =>
{
Var Context = Provider.getrequiredService (). Httpcontext;
var logger = provider.getrequiredService > ();
restore new userservice (context.user, logger);
});

2. Services named or key -based resolution

Asp.net core does not support this – tools like Autofac or Applied Assistance here when various implementation is needed.

⚠️ Common error when using dependency injection on Asp.net Core

❌ Too many examples of singleton

Old objects -Long increase the risk of leakage memory and outdated conditions.

❌ Use of service locator patterns

Direct access to environmental providers in the application often leads to a code that is difficult to test:

CSHARP

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// Avoid
Var Service = httpcontext.requestservices.getservice ();

❌ No registered dependencies

Error message: “Can’t complete the service for the type …”
➡️ Check if all interfaces correctly Container registered is.

🚀 Performance optimierung mit injection of dependence on asp.net core

• Avoid temporary servicesIf not absolutely necessary.

• Constructor injection promotion: Faster and avoid errors when walking.

• With a large application, its use container faster How Dryioc or Applied become meaningful.

📈 Practical examples: errors and solutions

🧪 Case study 1 too much temporary service

Financial service providers have registered more than 200 temporary services. The latus problem shows the last test. After refactoring to the scoped service, the average latency falls 35 %.

🔧 2-Scoped Addiction Case Study in Singleton

Logging (Singleton) services wrongly use DBCONTEXT (scoped). Applications fall into the production environment. The solution: separate recording from closed dependence.

🛠️ The Best Practice for the Assp.net Core Project

• Use the tryadd method*to avoid double registration.

• Use you Assembly Scan For automatic registration.

• Run regularly Configuration health check through – with Supervisor Or unit test.

• Integrate Validation of life cycle In your CI/CD pipe.

✅ Conclusion: Injection of dependence on Asp.net Core Corting

Injection of dependence on asp.net core Is a strong concept – but only if you use it correctly. From the life cycle choices to performance optimization, the targeted steps can make a difference between maintenance and future resistant codes.

For companies looking for .net solutions that can be discharged and sustainable, strategies that are well thought out are important components.

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