C# Language Features, From C# 2.0 to 4.0

• Introduction
• C# 2.0 Features

• Generics

• Without Generics
• With Generics
• Constraints and Method Parameters and Return Types
• Factories

Partial Types

Anonymous Methods

• The Old Way
• The New Way
• Async Tasks
• Updating The UI

Iterators

• The Old Way
• The New Way

Nullable Types

Private Setters (properties)

Method Group Conversions (delegates)

• The Old Way
• The New Way

C# 3.0 Features

• Implicitly Typed Local Variables

• Restrictions

Object and Collection Initializers

• The Old Way
• The New Way
• Initializing Collections

Auto-Implemented Properties

Anonymous Types

Extension Methods

• Before Extension Methods
• With Extension Methods

Query Expressions

• Left and Right Joins

Lambda Expressions

Expression Trees

C# 4.0 Features

• Dynamic Binding
• Named and Optional Arguments

• Example
• Optional Arguments, The Old Way

Generic Covariance and Contravariance

• Delegates
• Generics
• But How Do I Define My Own?

Conclusion

Introduction

This article discusses the language features introduced in C# 2.0, 3.0, and 4.0. The purpose of writing this article is to have a single repository of all the new language features introduced over the last seven years and to illustrate (where applicable) the advantages of the new features. It is not intended to be a comprehensive discussion of each feature, for that I have links for further reading. The impetus for this article is mainly because I could not find a single repository that does what this article does. In fact, I couldn't even find a Microsoft webpage that describes them. Instead, I had to rely on the universal authority for everything, Wikipedia, which has a couple nice tables on the matter.

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