Dometrain - Mastering: C#
 

# Dometrain - Mastering C#

**Mastering C#** is an advanced C# course from **Dometrain**, designed for developers who already know the basics of C# and want to write high-quality, modern, and maintainable code. It focuses on language features, best practices, performance, and real-world development rather than introductory programming.

## Prerequisites

Before starting, you should be comfortable with:

* Variables and data types
* Control flow (`if`, `switch`, loops)
* Methods
* Classes and objects
* Basic inheritance and interfaces
* Exception handling
* Basic use of the .NET CLI or Visual Studio

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# Course Outline

## Module 1: Advanced C# Fundamentals

* Value types vs reference types
* Memory management
* Garbage Collection (GC)
* Stack vs Heap
* Nullable reference types

**Skills gained:**

* Understand how C# stores and manages memory.
* Write safer code using nullable reference types.

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## Module 2: Object-Oriented Programming Deep Dive

* Encapsulation
* Inheritance
* Polymorphism
* Abstraction
* Composition vs inheritance
* SOLID principles

**Project:** Build a modular order processing system.

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## Module 3: Modern C# Features

* Records
* Init-only properties
* Pattern matching
* Switch expressions
* Target-typed `new`
* Top-level statements
* Required members
* File-scoped namespaces

**Skills gained:**

* Write concise, modern C# code.
* Improve readability and maintainability.

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## Module 4: Generics

* Generic classes
* Generic methods
* Constraints
* Covariance and contravariance

**Project:** Create a reusable generic repository.

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## Module 5: LINQ

* Query syntax
* Method syntax
* Filtering
* Projection
* Grouping
* Aggregation
* Joins
* Deferred execution

**Project:** Analyze and report on sales data.

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## Module 6: Delegates and Events

* Delegates
* Multicast delegates
* Lambda expressions
* Events
* Event handlers

**Project:** Build an event-driven notification system.

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## Module 7: Asynchronous Programming

* `async` and `await`
* `Task` and `Task<T>`
* Cancellation tokens
* Parallel programming
* Exception handling in async code

**Project:** Download multiple files concurrently.

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## Module 8: Collections

* `List<T>`
* `Dictionary<TKey,TValue>`
* `HashSet<T>`
* `Queue<T>`
* `Stack<T>`
* Immutable collections

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## Module 9: Error Handling

* Exceptions
* Custom exceptions
* Logging
* Result patterns
* Defensive programming

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## Module 10: Reflection and Attributes

* Reflection
* Custom attributes
* Metadata
* Dynamic loading

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## Module 11: Dependency Injection

* Inversion of Control (IoC)
* Dependency Injection (DI)
* Service lifetimes
* Constructor injection
* Built-in .NET DI container

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## Module 12: Performance

* Benchmarking
* `Span<T>`
* `Memory<T>`
* Object pooling
* Allocation reduction
* Efficient string handling

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## Module 13: Testing

* Unit testing
* Mocking
* Test-driven development (TDD)
* Integration testing

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## Module 14: Clean Code

* Naming conventions
* Refactoring
* Code smells
* Readability
* Maintainability

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## Module 15: Design Patterns

* Singleton
* Factory
* Strategy
* Observer
* Mediator
* Repository
* Decorator

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## Module 16: Advanced Topics

* Source generators
* Expression trees
* Dynamic programming
* Unsafe code (when appropriate)
* Interoperability with native code

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# Capstone Project

Develop a production-style application that demonstrates:

* Modern C# features
* Dependency Injection
* Asynchronous programming
* LINQ
* Unit testing
* Logging
* Error handling
* Clean architecture

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# Skills You'll Gain

* Advanced C# language proficiency
* Writing maintainable and expressive code
* Building high-performance .NET applications
* Applying SOLID principles and design patterns
* Effective use of async programming and LINQ
* Structuring code for testability and scalability

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# Recommended Companion Topics

To get the most from this course, consider studying alongside:

* .NET 8 or .NET 9 fundamentals
* ASP.NET Core Web API
* Entity Framework Core
* SQL Server or PostgreSQL
* Git and GitHub
* Docker
* Unit testing with xUnit or NUnit
* Clean Architecture

## Who Should Take This Course?

This course is ideal for:

* Developers with basic C# knowledge who want to deepen their expertise.
* .NET developers preparing for senior or lead roles.
* Backend developers building scalable applications.
* Software engineers preparing for technical interviews involving C# and .NET.

By completing an advanced course like **Dometrain - Mastering C#**, you should be able to write modern, idiomatic C# code, make informed design decisions, optimize performance where appropriate, and build robust applications using current .NET best practices.