C# ПІДРУЧНИКИ / c# / MS Press - Msdn Training Programming Net Framework With C#

Module 2: Introduction to a Managed Execution Environment

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Demonstrations

This section provides demonstration procedures that will not fit in the margin notes or are not appropriate for the student notes.

Hello World

This demonstration shows how to build a simple application in C#.

In the following procedures, use Notepad to create the simple Hello World application, and build and run the HelloDemoCS.exe application from the command line.

!To create the source code in C#

1.Open Notepad and type the following code:

//Allow easy reference to System namespace classes using System;

//Create class to hold program entry point

class MainApp {

public static void Main() {

// Write text to the console Console.WriteLine(“Hello World using C#!”);

}

}

2. Save the file as HelloDemoCS.cs.

Important To use Microsoft Visual Studio® .NET tools within a command prompt window, the command prompt window must have the proper environment settings. The Visual Studio .NET Command Prompt window provides such an environment. To run a Visual Studio .NET Command Prompt window, click Start, All Programs, Microsoft Visual Studio .NET,

Visual Studio .NET Tools, and Visual Studio .NET Command Prompt.

! To compile the source code and build an executable program

•From a Visual Studio .NET Command Prompt window, type the following syntax:

csc HelloDemoCS.cs

Running the resulting executable file will generate the following output:

Hello World using C#!

Viewing Assembly Metadata by Using the MSIL Disassembler

This demonstration shows how to use the Microsoft Intermediate Language (MSIL) Disassembler (Ildasm.exe) to view an assembly’s metadata.

The code for this demonstration is contained in one project and is located in <install folder>\Democode\Mod02. To demonstrate how to use the MSIL Disassembler to view the contents of the HelloDemoCS.exe assembly, follow the directions in Demonstration: Using the MSIL Disassembler in this module.