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 of .NET 8+
• Project structure, target frameworks, and fundamentals of multi-targeting
• Configuration of the development environment and tooling

Modern C# and Future-Ready Language Practices

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

ASP.NET Core Fundamentals and Application Setup

• Host builder, middleware pipeline, and request lifecycle
• Decision criteria for choosing between Minimal APIs and controller-based APIs
• Configuration providers, environment-specific settings, and secret management
• Static file handling, routing, and endpoint conventions
• Configuring the dependency injection container and defining service lifetimes

REST API Design and Implementation

• REST maturity model, resource modeling, and URI design principles
• HTTP methods, status codes, and content negotiation
• Request validation, model binding, and integration with FluentValidation
• Versioning strategies for public and internal APIs
• Documentation using OpenAPI and Swagger UI
• Testing APIs via TestServer and WebApplicationFactory

Enterprise Dependency Injection and Inversion of Control

• Constructor injection, service lifetimes, and addressing captive dependencies
• Applying decorator and factory patterns with the built-in container
• Integrating Scrutor and third-party dependency injection libraries
• Modular service registration and feature-based organization
• Handling cross-cutting concerns through 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
• Generating ProblemDetails and RFC 7807-compliant error responses
• Health checks, telemetry, and observability hooks
• Correlation IDs and preparation for distributed tracing

Software Architecture for Enterprise .NET Solutions

• Principles of layered, hexagonal, and clean architecture
• Domain-driven design components within .NET
• CQRS and mediator patterns implemented with MediatR
• Repository and unit-of-work patterns using EF Core
• Vertical slice architecture for 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 control, and resource guards
• Enforcing HTTPS, HSTS, and secure header middleware
• Input sanitization, output encoding, and mitigating OWASP Top 10 vulnerabilities
• Rate limiting, CORS policies, and anti-forgery token management
• Secret management via Azure Key Vault and environment-driven rotation

Code Quality, Maintainability, and Best Practices

• Coding standards, EditorConfig, and dotnet format
• Static analysis using Roslyn analyzers and SonarQube integration
• Unit testing with xUnit and mocking using Moq or NSubstitute
• Integration and contract testing within CI pipelines
• Refactoring techniques for long-term legacy modules
• Documentation, API contracts, and knowledge-sharing practices

Modernization Strategy: Assessing Legacy .NET Framework Code

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

Progressive Migration and Coexistence Techniques

• Strangler Fig pattern: gradually replacing legacy subsystems
• API-first migration: exposing .NET Framework domains via REST facades
• Message-based bridging using RabbitMQ, Azure Service Bus, or Kafka
• Shared database coexistence and schema versioning strategies
• Running .NET Framework and .NET 8 side-by-side within the same infrastructure
• Containerizing modern components while retaining legacy on IIS

Hands-On Migration Lab and Review

• Applying the Upgrade Assistant to a representative legacy project
• Refactoring a Web Forms or WCF service into ASP.NET Core APIs
• Implementing DI, 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
• Review, Q&A, and guidance for post-training modernization planning