.NET
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The request lifecycle in a .NET 9 Minimal API / MVC application follows a series of steps from incoming request to response generation. Understanding this helps in performance tuning, debugging, and implementing middleware effectively.
1️⃣ Client Sends Request → (Browser/Postman/Frontend App)
2️⃣ Kestrel Web Server Receives Request
3️⃣ Middleware Pipeline Processes Request
4️⃣ Routing Determines Controller/Minimal API
5️⃣ Model Binding & Validation (if applicable)
6️⃣ Controller Action / Minimal API Executes
7️⃣ Service Layer Handles Business Logic
8️⃣ Database Interaction Occurs (via Repository/EF Core)
9️⃣ Response Is Generated
🔟 Middleware Pipeline Handles Response
🔟 Response Is Sent Back to Client
- Kestrel is the built-in cross-platform web server in ASP.NET.
- Listens for incoming HTTP requests and forwards them to the middleware pipeline.
🔹 Example:
GET https://localhost:5001/api/expenses
- Middleware components process requests in a sequential order.
- Can short-circuit requests (e.g., authentication, caching).
- Configured in
Program.cswithapp.UseMiddleware<>.
app.Use(async (context, next) =>
{
Console.WriteLine($"Request: {context.Request.Method} {context.Request.Path}");
await next(); // Pass request to next middleware
});
| Middleware | Purpose |
|---|---|
| UseExceptionHandler | Global error handling |
| UseRouting | Determines request path |
| UseAuthentication | Handles JWT, OAuth, etc. |
| UseAuthorization | Verifies user permissions |
| UseRateLimiter | Throttles requests |
- Understanding the request lifecycle helps optimize performance.
- Middleware placement is crucial for efficient request processing.
- Asynchronous programming improves scalability.
- Database optimizations prevent performance bottlenecks.
This ensures your .NET 9 API is efficient, scalable, and production-ready! 🚀 Let me know if you need further details! 😊
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In .NET DI, you can conditionally apply the Decorator Pattern based on configuration or runtime conditions using IServiceCollection.
public class LoggingExpenseServiceDecorator : IExpenseService
{
private readonly IExpenseService _inner;
private readonly ILogger<LoggingExpenseServiceDecorator> _logger;
public LoggingExpenseServiceDecorator(IExpenseService inner, ILogger<LoggingExpenseServiceDecorator> logger)
{
_inner = inner;
_logger = logger;
}
public async Task<string> ProcessExpenseAsync(decimal amount)
{
_logger.LogInformation($"Processing expense: {amount} USD");
var result = await _inner.ProcessExpenseAsync(amount);
_logger.LogInformation($"Expense processed successfully: {result}");
return result;
}
}
Conditionally Register the Decorator in Program.cs
var builder = WebApplication.CreateBuilder(args);
var services = builder.Services;
// Register the base service
services.AddScoped<IExpenseService, ExpenseService>();
// Conditionally apply the decorator
bool useLoggingDecorator = builder.Configuration.GetValue<bool>("UseLoggingDecorator");
if (useLoggingDecorator)
{
services.AddScoped<IExpenseService>(provider =>
{
var innerService = provider.GetRequiredService<ExpenseService>();
var logger = provider.GetRequiredService<ILogger<LoggingExpenseServiceDecorator>>();
return new LoggingExpenseServiceDecorator(innerService, logger);
});
}
var app = builder.Build();
Enable/Disable Decorator Using Configuration
{
"UseLoggingDecorator": true
}
* Set to true → Decorator will be applied.
* Set to false → Only the base service (ExpenseService) will be used.
read
- https://timdeschryver.dev/blog/the-decorator-pattern-using-nets-dependency-injection
- https://medium.com/@anderson.buenogod/mastering-the-decorator-pattern-in-c-net-8-advanced-use-cases-and-best-practices-378974abe9be
Approach 1
Approach 2
Approach 3 - Using Keyed Services to Register Multiple Implementations of the Same Interface
