C# Introduction
- C# is pronounced as C sharp.
- C# is strong typed object-oriented programming language.
- C# is keeping developed by a team in Microsoft.
- C# programs run in .Net Framework.
- C# syntax is easy to learn if the leaner is familiar with any of c, C++ or Java.
- C# newest version is C# 5.0 and was released on August 15, 2012.
- .Net Framework is a software framework developed by Microsoft.
- .Net Framework consists of Framework Class Library (FCL) and Common Language Runtime (CLR).
- FCL is a large predefined library which can be invoked directly by any of .Net Framework supported language, like C#.
- CLR is an execution environment of .Net Framework and it provides memory management, security and exception handling services.
- C# code can be compiled into Microsoft Intermediate Language (MSIL) and runs in .Net Framework.
- CLR is responsible for converting MSIL into local machine language then run it.
- .Net Framework provides language interoperability.
You can see the .Net Framework is installed on an operation system, currently it is windows system. The C# application is running under the .Net Framework.
- Object oriented programming (OOP) is a software developing paradigm which is using data fields and methods in a bunch of objects comparing with procedural programming.
- Object refers to a particular instance of a class and a class is a combination of fields, methods and data structures.
- The real world consists of all kinds of objects and the objects with the same actions and similar properties can belong to the same class.
- For example, person can be a class and you or your friends are all objects. Tree is a class and the tree in front of your home is an object.
- A class defines its attributes and methods. For example, a person has gender, age and color of eyes and he can run, swim and think.
- OOP can create a new class, instantiate objects or reuse lots of existing classes like the classes in FCL in .Net Framework.
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public class Person { private string name; private int age; private DateTime dateOfBirth; public void drive(){ // Drive code here } }