掌握Visual Basic .NET：迎接未来十年编程挑战

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"《Sybex - Mastering Visual Basic .NET (VBL)》是一本深入介绍Visual Basic .NET编程语言的书籍，针对的是想要充分利用该语言的程序员，特别是那些希望在快速发展的IT领域保持竞争力的开发者。本书是在Visual Basic 1.0发布十周年之际推出的，旨在带领读者度过接下来十年的编程挑战。 .NET框架是.NET倡议的核心，它提供了一个庞大的函数库，几乎涵盖了所有编程任务，如绘制图形、创建文件夹、获取文件等。Visual Basic .NET作为一门易学且生产力高的语言，它的新版本通过访问.NET框架的对象，极大地扩展了功能，使其几乎可以完成其他语言所能实现的大部分任务，使语言变得非常强大，但也使得学习曲线变得更陡峭。书中假设读者对基本的编程概念有所了解，包括变量、函数和条件语句的工作原理。作者选择深入探讨他认为大多数VB程序员会感兴趣的议题，例如应用程序开发原则和技术，而非浅尝辄止地介绍众多主题。章节中的代码示例着重于核心逻辑，而非完整的项目或控件详细描述，旨在帮助读者理解和掌握核心编程技巧。书中不仅涵盖了基础的Windows应用程序开发，还提供了实用的、具有实际应用价值的例子，如文件和目录映射、表格打印和对象集合保存等。作者强调，编程不仅仅是遵循指令，更重要的是理解原理并能灵活运用到不同场景中。书中提供的详细步骤指导有助于完成特定任务，同时也会解释为什么要这样处理，并展示替代方法和前后知识的关联。虽然书中不会深入讲解热门功能，如多线程编程，而是专注于扎实的编程技术和实践，帮助读者建立起坚实的基础。随着读者掌握了书中的内容，他们将能够应对未被讨论的先进主题。为了充分利用电子书，读者需要安装Adobe Acrobat Reader带有搜索功能，通过搜索功能可以方便地查找书中内容。电子书提供了导航工具，包括搜索查询按钮和强大的搜索选项，以帮助用户找到所需信息。通过阅读这本书，读者不仅能提升自己的Visual Basic .NET技能，还能培养创造性解决问题的能力和对编程模型的理解。"

So, what’s the distinction between Visual Studio .NET and the language? Visual Studio .NET is

the environment that provides all the necessary tools for developing applications. The language is

only one aspect of a Windows application. The visual interface of the application isn’t tied to a spe-

cific language, and the same tools you’ll use to develop your application’s interface will also be used

by all programmers, regardless of the language they’ll use to code the application.

The tools you’ll use to access databases are also independent of the language. Visual Studio pro-

vides tools that allow you to connect to a database, inspect its objects, retrieve the information you’re

interested in, and even store it in objects that can be accessed from within any language.

There are many visual tools in the IDE, like the Menu Designer. This tool allows you to visually

design menus and to set their names and basic properties (such as checking, enabling, or disabling

certain options). Designing a menu doesn’t involve any code, and it’s carried out with point-and-

click operations. Of course, you will have to insert some code behind the commands of your menus,

and (again) you can use any language to program them.

To simplify the process of application development, Visual Studio .NET provides an environment

that’s common to all languages, which is known as integrated development environment (IDE). The purpose

of the IDE is to enable the developer to do as much as possible with visual tools, before writing code.

The IDE provides tools for designing, executing, and debugging your applications. It’s your second

desktop, and you’ll be spending most of your productive hours in this environment.

The Start Page

When you run Visual Studio for the first time, you will see the window shown in Figure 1.1. On the

My Profile tab, you will set your personal preferences by specifying your language. Select Visual

Basic Developer in the Profile box, and the other two boxes will be filled automatically. You can

leave the other fields to their default values. The ComboBox control at the bottom of the page, the

At Startup control, is where you define what you want Visual Studio .NET to do when it starts.

The choices are the following:

Show Start Page Every time you start Visual Studio .NET, this page will appear.

Load Last Loaded Solution Once you start working on a real project (a project that will take

you from a few days to a few months to complete), select this option so that the project will be

loaded automatically every time you start Visual Studio .NET.

Show Open Project Dialog Box Every time you start Visual Studio .NET, the Open Project

dialog box will appear, where you can select a project to open.

Show New Project Dialog Box Every time you start Visual Studio .NET, the New Project

dialog box will appear, where you can specify the name of a new project—a setting to avoid.

Show Empty Environment This option instructs Visual Studio .NET to start a new empty

solution, and you’re responsible for adding new or existing projects to the solution and new or

existing items to a project.

The actions are self-explanatory, and the most common setting is to show the Start Page. The

Start Page displays the four most recently opened projects, as well as the New Project and Open

Project buttons. To see the Start Page, select the Get Started option.

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template, and Visual Studio will suggest the name WindowsApplication1 as the project name. Change

it to MyTestApplication. Under the project’s name is another box, named Location. This is the folder

in which the new project will be created (every project is stored in its own folder). Visual Studio will

create a new folder under the one specified in the Location box and will name it after the project. You

can leave the default project folder and click the OK button.

VB6

➠

VB.NET

Unlike previous versions of Visual Basic, Visual Basic .NET creates a new folder for the project and saves

the project’s files there, even before you edit them. The IDE saves the changes to the project’s files by default

every time you run the project. To change this behavior, use the Tools

➢

Options dialog box, which is

described later in this book.

What you see now is the Visual Studio IDE displaying the Form Designer for a new project

(Figure 1.3). The main window is the Form Designer, and the gray surface on it is the window of

your new application in design mode. Using the Form Designer, you’ll be able to design the visible

interface of the application (place various components of the Windows interface on the form) and

then program the application.

The default environment is rather crowded, so let’s hide a few of the toolbars we’re not going to

use in the projects of the first few chapters. You can always show any of the toolbars at any time.

Open the View menu and select Toolbars. You will see a submenu with 28 commands, which are

toggles. Each command corresponds to a toolbar, and you can turn the corresponding toolbar on or

off by clicking one of the commands in the Toolbar submenu. Turn off all the toolbars except for

the Layout and Standard toolbars.

The last item in the Toolbars submenu is the Customize command, which leads to a dialog box

where you can specify which of the toolbars and which of the commands you want to see.

Figure 1.2

The New Project

dialog box

Chapter 1 GETTING STARTED WITH VB.NET

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