Advanced Dependency Injection in .NET MAUI: Leveraging Scoped and Transient Services for Scalable Architecture

Table of Contents

1. DI Fundamentals in .NET MAUI
   • Service Lifetime Deep Dive
   • MAUI's DI Container Architecture
   • Registration Patterns
2. Advanced Service Lifetimes
   • Scoped Services in Depth
   • Transient Services Optimization
   • Singleton Patterns and Pitfalls
3. Architectural Patterns
   • Vertical Slice Architecture
   • Modular DI Configuration
   • Cross-Platform Service Abstraction
4. Performance Optimization
   • Memory Management
   • Startup Performance
   • DI Container Benchmarks
5. Real-World Scenarios
   • Authentication Flows
   • Database Connection Management
   • Caching Strategies
6. Testing Strategies
   • Unit Testing with DI
   • Integration Testing Patterns
   • Mocking Frameworks
7. Advanced Topics
   • Custom Lifetime Managers
   • Child Containers
   • AOP with DI

1. DI Fundamentals in .NET MAUI

1.1 Service Lifetime Deep Dive

Key Concepts:

• Transient: New instance per resolution (stateless services)
• Scoped: Single instance per scope (request/session)
• Singleton: Single instance per container (application lifetime)

1.2 MAUI's DI Container Architecture

.NET MAUI uses Microsoft.Extensions.DependencyInjection with enhancements:

Container Hierarchy:

1. Root Provider: Singleton services
2. Scope Providers: Scoped services
3. Transient Factory: Always creates new instances

2. Advanced Service Lifetimes

2.1 Scoped Services in Depth

Implementation Pattern:

Common Use Cases:

• User session management
• Database transaction units
• Request-specific caching

Scoped Service Example:

2.2 Transient Services Optimization

Memory Optimization Pattern:

When to Use:

• Stateless utility services
• ViewModel dependencies
• Pure functions

3. Architectural Patterns

3.1 Vertical Slice Architecture with DI

Module Registration:

3.2 Cross-Platform Service Abstraction

Shared Interface:

4. Performance Optimization

4.1 Memory Management

Leak Prevention Checklist:
✔ Avoid capturing scoped services in singletons
✔ Implement IDisposable for scoped resources
✔ Use weak references for event subscriptions Diagnostic Tools:

4.2 Startup Optimization

Lazy Initialization Pattern:

Benchmark Results:

5. Real-World Scenarios

5.1 Authentication Flow

DI Configuration:

5.2 Database Connection Management

Scoped Unit of Work:

6. Testing Strategies

6.1 Unit Testing with DI

Test Setup:

6.2 Integration Testing

Test Host Builder:

7. Advanced Topics

7.1 Custom Lifetime Managers

Session-Based Lifetime:

7.2 Aspect-Oriented Programming

DI-Powered AOP:

Conclusion

This guide has explored advanced DI patterns in .NET MAUI with practical implementations. Key takeaways:

1. Choose lifetimes carefully - Match service lifetimes to usage patterns
2. Architect for testability - Leverage DI for better test isolation
3. Monitor performance - Profile memory and initialization overhead
4. Embrace modularity - Organize services by feature domains