.NET Core Interview Preparation Demo

A comprehensive .NET 9 Web API project demonstrating various concepts and patterns commonly asked in interviews.

Features

Middleware

• Custom Exception Handler - Global exception handling
• Rate Limiting - Redis-based request throttling
• Performance Monitoring - Request timing middleware
• Request Logging - HTTP request/response logging
• Maintenance Mode - Application maintenance middleware

Controllers

• Patient API - CRUD operations with Entity Framework
• Security Controller - JWT authentication examples

Services

• GuidService - Demonstrates primary constructors (C# 12)
• UserService - User management operations

Data Access

• Entity Framework Core - SQL Server integration
• DbContext - Patient data management

Interview Questions

• Algorithm implementations
• LINQ examples
• Exception handling patterns
• Parallel processing examples

Quick Start

# Clone and run
dotnet restore
dotnet run

# Watch mode (full restart)
dotnet watch --no-hot-reload

Packages

# Core packages
dotnet add package Swashbuckle.AspNetCore
dotnet add package Microsoft.EntityFrameworkCore.SqlServer
dotnet add package Microsoft.AspNetCore.Authentication.JwtBearer
dotnet add package StackExchange.Redis
dotnet add package Microsoft.AspNetCore.Mvc.Versioning.ApiExplorer

API Endpoints

• GET /api/patient - Get all patients
• POST /api/patient - Create patient
• GET /swagger - API documentation

Primary Constructor Example

// Traditional approach
public class GuidService
{
    public Guid Id { get; set; }
    public GuidService() => Id = Guid.NewGuid();
}

// Primary constructor (C# 12)
public class GuidService(Guid id = default)
{
    public Guid Id { get; set; } = id == default ? Guid.NewGuid() : id;
}