2002年ASP.NET完整参考指南

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《Asp .NET Complete Reference (2002)》是由Matthew MacDonald编著的一本详尽的ASP.NET参考书籍，由McGraw-Hill/Osborne出版。本书专注于提供ASP.NET技术的全面指南，该版本可能是在2002年发行，针对的是当时的最新技术和框架。书中涵盖了丰富的主题，包括但不限于ASP.NET的核心概念、控件、Web服务、数据访问、安全性和部署策略等。作者在序言部分强调了版权法律要求，所有内容受1976年《美国版权法》保护，未经出版商书面许可，读者不得以任何形式复制、分发或存储于数据库或检索系统中，除非用于计算机程序列表的录入、存储和执行。这体现了对知识产权的尊重以及对合法使用软件和文档的严谨态度。书中内容详细且实用，适合于Web开发者、架构师和系统管理员，无论是初学者还是进阶者，都能从中获取深入理解ASP.NET开发所需的技术细节。它可能包含对.NET Framework的早期版本（如.NET 1.x）的全面介绍，因为当时.NET Framework正逐渐成为企业级Web应用开发的主流平台。此外，本书可能还涉及了ASP.NET MVC、Web Forms、Session管理、Cookies、Authentication和Authorization等核心组件的使用方法，以及如何构建可扩展、高性能的应用程序。由于是2002年的出版物，书中可能会对现代的异步编程、服务器端验证、AJAX和云技术有所提及，但可能不涵盖最新的.NET Core和现代化Web开发最佳实践。为了获取更广泛的销售折扣、促销优惠、奖励或筹款支持，读者应联系McGraw-Hill/Osborne的指定地址。对于国际读者，有关翻译或海外分销的信息可以在书后的国际联系信息页面上找到。《Asp .NET Complete Reference (2002)》是一本极具价值的历史性资源，对于了解早期ASP.NET技术发展和实践有着不可替代的作用，尽管随着时间的推移，部分内容可能需要结合后续更新的知识来补充。

Data Type Changes from Visual Basic 6

Luckily for VB developers, the list of data types in .NET is quite similar to the data types from

earlier versions. Some changes, however, were unavoidable:

z Visual Basic defined an Integer as a 16-bit number with a maximum value of 32,767.

VB .NET, on the other hand, defines an Integer as a 32-bit number. Long now refers to a 64-

bit integer, while Short refers to a 16-bit integer.

The Currency data type has been replaced by Decimal, which supports more decimal places

(and thus greater accuracy).

Fixed-length strings are no longer supported.

z Variants are no longer supported and have been replaced with the generic Object type,

which can hold any object or data type.

z The Date data type has increased range and precision and works slightly differently.

Depending on your code, you may need to rewrite date manipulation code.

Declaring Variables

To create a variable, you need to identify a data type and a variable name. In VB .NET, the name

comes first, after a special Dim keyword. In C#, the data type starts the line.

VB .NET

Dim ErrorCode As Integer

Dim MyName As String

int errorCode;

string myName;

characters.

Boolean

bool

A True or False value (or lowercase true or

false in C#).

DateTime

Date

N/A

[*]

Represents any date and time from 12:00:00

AM, January 1 of the year 1 in the Gregorian

calendar to 11:59:59 PM, December 31, year

9999. Time values can resolve values to 100

nanosecond increments. Internally, this data

type is stored as a 64-bit integer.

TimeSpan

N/A

[*]

N/A

[*]

Represents a period of time, as in 10

seconds or 3 days. The smallest possible

interval is 1 "tick" (100 nanoseconds).

Object

object

The ultimate base class of all .NET types.

Can contain any data type or object.

[*]

If the language does not provide an alias for a given type, you can use the .NET class name.

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In C#, the convention is to begin variable names with a lowercase letter, unless you are creating a

public variable that can be seen from other classes. Public variables or properties should always

use an initial capital.

You can also create a variable by using the type from the .NET class library. This approach

produces identical variables. It's also a requirement if you need to create a variable to hold an

object or a type of data that doesn't have an alias built into the language.

VB .NET

Dim ErrorCode As System.Int32

Dim MyName As System.String

System.Int32 errorCode;

System.String myName;

These examples use fully qualified type names that indicate that the Int32 type is found in the

System namespace (along with all the fundamental types). In Chapter 3, we'll discuss types and

namespaces in more detail.

What's in a Name: Data Types

You'll notice that the preceding examples don't use variable prefixes. Most Visual Basic and C++

programmers are in the habit of adding a few characters to the start of a variable name to indicate

its data type. In .NET, this practice is de-emphasized because data types can be used in more

flexible ways without any problem, and most variables hold references to full objects anyway. In

this book, variable prefixes are not used, except for web controls, where it helps to distinguish

lists, text boxes, buttons, and other common user interface elements. In your own programs, you

should follow a consistent (typically company-wide) standard that may or may not adopt a system

of variable prefixes.

Initializers

You can also assign a value to a variable in the same line that you create it. This feature is

common to C++ programmers, but a new addition to VB .NET.

VB .NET

Dim ErrorCode As Integer = 10

Dim MyName As String = "Matthew"

int errorCode = 10;

string myName = "Matthew";

In Visual Basic, you can use a simple data variable without initializing it. Numbers will be

automatically initialized to 0, and strings to an empty string (""). In C#, however, you must assign a

value to a variable before you attempt to read from it. For example, the following statement will

succeed in VB .NET, but would fail in C# if the Number variable had not been initialized to a value.

Number = Number + 1

2-3

Arrays can include any data type, including objects. They also automatically support read-only

iteration. This means you can use a For Each syntax to loop through all the elements in an array.

This is a common trick that is often used with collections, but .NET allows you to use it with arrays

as well.

VB .NET

Dim StringArray() As String = {"one", "two", "three"}

Dim Element As String

For Each Element In MyStringArray

' This code loops three times, with the Element variable set to

' "one", then "two", and then "three".

string[] stringArray = {"one", "two", "three"};

// Note that you don't need to define the element variable first in C#.

// Instead, you define it "inside" the foreach brackets.

foreach (string element in myStringArray)

{

// This code loops three times, with the element variable set to

// "one", then "two", and then "three".

}

In a multi-dimensional array, the For Each iteration would move over each column in a single row

first, and then move to the next row.

One nice feature that VB .NET offers but C# lacks is array redimensioning. In VB .NET, all arrays

start with an initial size, and any array can be resized. To resize an array, you use the ReDim

keyword.

Dim MyArray(10, 10) As Integer

ReDim MyArray(20, 20)

In this example, all the contents in the array will be erased when it is resized. To preserve the

contents, you can use the optional Preserve keyword when redimensioning the array. However, if

you are using a multi-dimensional array you will only be able to change the last dimension, or a

runtime error will occur.

Dim MyArray(10, 10) As Integer

'Allowed, and the contents will remain.

ReDim Preserve MyArray(10, 20)

' Not allowed. A runtime error will occur.

ReDim Preserve MyArray(20, 20)

To achieve the same effect in C#, you need to write manual array copying code, or just use a

collection class such as the ArrayList, which always allows a dynamic size.

Collections Replace Arrays in Many Scenarios

In many cases, it's easier to use a full-fledged collection rather than an array. Collections are

generally better suited to modern object-oriented programming and are used extensively in

ASP.NET. The .NET class library provides many types of collection classes, including simple

collections, sorted lists, key-indexed lists (dictionaries), and queues.

2-5

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