C# Tutorials - Herong's Tutorial Examples

∟Data Type Features

∟Type System Unification

This section describes type system unification. All types in C# are derived from 'object'.

C# has an interesting feature called "Type System Unification". In C#, all types, value based or reference based, predefined or user defined, are all derived from "object". The following program shows some interesting elements of this feature: 

// Boxing.cs
// Copyright (c) 2006 HerongYang.com. All Rights Reserved.

using System;
class Boxing {
   static void Main() {
      int i = 123;
      object o = i;
      int j = (int) o;
      Console.WriteLine("i      = {0}",i);
      Console.WriteLine("object = {0}",o.ToString());
      Console.WriteLine("j      = {0}",j);
   }
}

Output: 

i      = 123
object = 123
j      = 123

Table of Contents

 About This Book

 Introduction of C# (C Sharp)

 Data Type and Variables

 Logical Expressions and Conditional Statements

 Arrays and Loop Statements

►Data Type Features

 The "decimal" Data Type

 Simple Types Are "struct" Types

►Type System Unification

 Jagged Arrays

 Floating-Point Data Types

 Passing Parameters to Methods

 Execution Environment Class

 Visual C# 2010 Express Edition

 Class Features

 C# Compiler and Intermediate Language

 Compiling C# Source Code Files

 MSBuild - Microsoft Build Engine

 Memory Usages of Processes

 Multithreading in C#

 Async Feature from C# 5

 System.IO.FileInfo Class

 System.Diagnostics.FileVersionInfo Class

 WPF - Windows Presentation Foundation

 Partial Classes and Partial Methods

 Archived Tutorials

 References

 Full Version in PDF/ePUB