Modern .NET 8 Development, Enterprise Architecture, and Progressive Migration from .NET Framework Training Course

Introduction to the Modern .NET Platform

• Overview of the .NET 8 runtime, SDK, and unified platform
• Comparative analysis of .NET Framework, .NET Core, and the evolution to .NET 8+
• Project structures, target frameworks, and fundamentals of multi-targeting
• Configuration of the development environment and associated tooling

Modern C# and Future-Oriented Language Practices

• Utilizing records, init-only setters, and immutability patterns
• Enhanced pattern matching and switch expressions
• Implementation of nullable reference types and compiler-driven safety
• Best practices for Async/await and memory-efficient streaming
• Generic math, static abstracts in interfaces, and performance-oriented APIs
• Preparing codebases for upcoming C# 12/13 features on the .NET 8 platform

ASP.NET Core Fundamentals and Application Bootstrap

• Host builder, middleware pipeline, and request lifecycle management
• Decision criteria for Minimal APIs versus controller-based APIs
• Configuration providers, environment-specific settings, and secrets management
• Handling static files, routing, and endpoint conventions
• Configuring the dependency injection container and managing service lifetimes

REST API Design and Implementation

• REST maturity model, resource modeling, and URI design principles
• Application of HTTP methods, status codes, and content negotiation
• Request validation, model binding, and integration with FluentValidation
• Versioning strategies for both public and internal APIs
• Generating documentation using OpenAPI and Swagger UI
• Conducting integration testing of APIs with TestServer and WebApplicationFactory

Enterprise Dependency Injection and Inversion of Control

• Constructor injection, service lifetimes, and management of captive dependencies
• Implementing decorator and factory patterns within the built-in container
• Integrating Scrutor and third-party dependency injection libraries
• Modular service registration and feature-based organization
• Addressing cross-cutting concerns via middleware and filters

Logging, Configuration, and Centralized Error Handling

• Structured logging using Microsoft.Extensions.Logging and Serilog
• Managing log levels, scopes, enrichment, and sink configuration
• Implementing exception middleware and global error handling pipelines
• Utilizing ProblemDetails and RFC 7807-compliant error responses
• Setting up health checks, telemetry, and observability hooks
• Preparation for correlation IDs and distributed tracing

Software Architecture for Enterprise .NET Solutions

• Principles of layered, hexagonal, and clean architecture
• Domain-driven design building blocks in the .NET ecosystem
• Implementing CQRS and mediator patterns using MediatR
• Applying repository and unit-of-work patterns with EF Core
• Vertical slice architecture for enhanced feature cohesion
• Evaluating trade-offs between monolith, modular monolith, and microservices

Security for Web Applications and APIs

• Authentication schemes: JWT, OAuth2, OpenID Connect, and cookie-based flows
• Authorization policies, claims-based access, and resource-based guards
• Enforcing HTTPS, HSTS, and secure header middleware
• Input sanitization, output encoding, and mitigation of OWASP Top 10 threats
• Implementing rate limiting, CORS policies, and anti-forgery token handling
• Managing secrets with Azure Key Vault and environment-driven rotation

Code Quality, Maintainability, and Best Practices

• Establishing coding standards, utilizing EditorConfig, and dotnet format
• Performing static analysis with Roslyn analyzers and integrating SonarQube
• Conducting unit testing with xUnit and mocking using Moq or NSubstitute
• Implementing integration and contract testing within CI pipelines
• Refactoring techniques for long-lived legacy modules
• Best practices for documentation, API contracts, and knowledge sharing

Modernization Strategy: Assessing Legacy .NET Framework Code

• Portfolio analysis: classifying applications by criticality, complexity, and business value
• Utilizing the .NET Upgrade Assistant and compatibility analyzer
• Identifying deprecated APIs, platform-specific dependencies, and third-party gaps
• Considering Windows-specific APIs and WCF migration implications
• Developing a migration roadmap with risk-based prioritization

Progressive Migration and Coexistence Techniques

• Applying the Strangler Fig pattern to incrementally replace legacy subsystems
• API-first migration: exposing .NET Framework domains through REST facades
• Message-based bridging using RabbitMQ, Azure Service Bus, or Kafka
• Strategies for shared database coexistence and schema versioning
• Running .NET Framework and .NET 8 side-by-side within the same infrastructure
• Containerizing modern components while retaining legacy systems on IIS

Hands-On Migration Lab and Review

• Applying the Upgrade Assistant to a representative legacy project
• Refactoring Web Forms or WCF services into ASP.NET Core APIs
• Implementing dependency injection, logging, and centralized error handling in the migrated solution
• Adding authentication and authorization to the new API surface
• Verifying coexistence through end-to-end integration testing
• Final review, Q&A session, and guidance for post-training modernization planning