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 Duration 21 hours

Course Outline

Introduction to the Modern .NET Platform

  • Overview of the .NET 8 runtime, SDK, and unified platform
  • Comparing the evolution of .NET Framework, .NET Core, and .NET 8+
  • Understanding project structure, target frameworks, and multi-targeting fundamentals
  • Setting up the development environment and necessary tooling

Modern C# and Future-Oriented Language Practices

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

ASP.NET Core Fundamentals and Application Bootstrap

  • Host builder, middleware pipeline, and request lifecycle
  • Choosing between Minimal APIs and controller-based APIs: decision criteria
  • 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
  • HTTP methods, status codes, and content negotiation
  • Request validation, model binding, and FluentValidation integration
  • Versioning strategies for public and internal APIs
  • Generating documentation with OpenAPI and Swagger UI
  • Performing integration testing using TestServer and WebApplicationFactory

Enterprise Dependency Injection and Inversion of Control

  • Constructor injection, service lifetimes, and avoiding captive dependencies
  • Applying decorator and factory patterns with the built-in container
  • Integrating Scrutor and third-party DI 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
  • Configuring log levels, scopes, enrichment, and sinks
  • Implementing exception middleware and global error handling pipelines
  • Using ProblemDetails and RFC 7807-compliant error responses
  • Implementing health checks, telemetry, and observability hooks
  • Managing correlation IDs and preparing for distributed tracing

Software Architecture for Enterprise .NET Solutions

  • Principles of layered, hexagonal, and clean architecture
  • Domain-driven design building blocks within .NET
  • CQRS and mediator patterns implemented with MediatR
  • Repository and unit-of-work patterns using EF Core
  • Vertical slice architecture for enhanced feature cohesion
  • Evaluating trade-offs between monoliths, modular monoliths, 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-based guards
  • Enforcing HTTPS, HSTS, and secure header middleware
  • Input sanitization, output encoding, and OWASP Top 10 mitigation
  • 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, EditorConfig, and dotnet format
  • Performing static analysis with Roslyn analyzers and SonarQube integration
  • Unit testing with xUnit and mocking with Moq or NSubstitute
  • 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 analyzers
  • 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

  • Implementing the Strangler Fig pattern to incrementally replace legacy subsystems
  • API-first migration: exposing .NET Framework domains via 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 maintaining legacy systems 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
  • Final review, Q&A, and guidance for post-training modernization planning

Requirements

  • Proficiency in C# programming and object-oriented design principles
  • Familiarity with core web development concepts (HTTP, HTML, CSS, and JavaScript basics)
  • Basic understanding of relational databases and SQL
  • Prior exposure to .NET Framework or ASP.NET is beneficial but not mandatory

Audience

  • .NET developers and architects preparing to modernize legacy .NET Framework applications
  • Software engineers transitioning into enterprise .NET development roles
  • Technical leads responsible for planning platform migration and coexistence
  • DevOps and infrastructure personnel supporting .NET application lifecycles

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