ASPNET技术毕业论文外文文献翻译及原文

　　毕 业 设 计（论文）

　　外 文 文 献 翻 译

　　文献、资料中文题目：http://www.wendangwang.com 技术

　　文献、资料英文题目：http://www.wendangwang.com Technique 文献、资料来源：

　　文献、资料发表（出版）日期：

　　院 （部）：

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　　姓 名：

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　　翻译日期： 2017.02.14

　　Furthermore, these languages contain similar programming constructs. Every language, for example, can represent loops and conditionals. Even though the syntax of a conditional written in Visual Basic differs from the syntax of a conditional written in C++, the programming function is the same.

　　Finally, most programming languages have similar variable data types. In most languages, you have some means of representing strings and integers, for example. The maximum and minimum size of an integer might depend on the language, but the basic data type is the same.

　　Maintaining all this functionality for multiple languages requires a lot of work. Why keep reinventing the wheel? Wouldn't it be easier to create all this functionality once and use it for every language?

　　The .NET Framework Class Library does exactly that. It consists of a vast set of classes designed to satisfy any conceivable programming need. For example, the .NET framework contains classes for handling database access, working with the file system, manipulating text, and generating graphics. In addition, it contains more specialized classes for performing tasks such as working with regular expressions and handling network protocols.

　　The .NET framework, furthermore, contains classes that represent all the basic variable data types such as strings, integers, bytes, characters, and arrays.

　　Most importantly, for purposes of this book, the .NET Framework Class Library contains classes for building http://www.wendangwang.com pages. You need to understand, however, that you can access any of the .NET framework classes when you are building your http://www.wendangwang.com pages.

　　Understanding Namespaces

　　As you might guess, the .NET framework is huge. It contains thousands of classes (over 3,400). Fortunately, the classes are not simply jumbled together. The classes of the .NET framework are organized into a hierarchy of namespaces.

　　ASP Classic Note

　　In previous versions of Active Server Pages, you had access to only five standard classes (the Response, Request, Session, Application, and Server objects). http://www.wendangwang.com, in contrast, provides you with access to over 3,400 classes!

　　A namespace is a logical grouping of classes. For example, all the classes that relate to working with the file system are gathered together into the System.IO namespace.

　　The namespaces are organized into a hierarchy (a logical tree). At the root of the tree is the System namespace. This namespace contains all the classes for the base data types, such as strings and arrays. It also contains classes for working with random numbers and dates and times.

　　You can uniquely identify any class in the .NET framework by using the full namespace of the class. For example, to uniquely refer to the class that represents a file system file (the File class), you would use the following:

　　ASP CLASSIC NOTE

　　What about VBScript? Before http://www.wendangwang.com, VBScript was the most popular language for developing Active Server Pages.

　　http://www.wendangwang.com does not support VBScript, and this is good news. Visual Basic is a superset of VBScript, which means that Visual Basic has all the functionality of VBScript and more. So, you have a richer set of functions and statements with Visual Basic.

　　Furthermore, unlike VBScript, Visual Basic is a compiled language. This means that if you use Visual Basic to rewrite the same code that you wrote with VBScript, you can get better performance.

　　If you have worked only with VBScript and not Visual Basic in the past, don't worry. Since VBScript is so closely related to Visual Basic, you'll find it easy to make the transition between the two languages.

　　NOTE

　　Microsoft includes an interesting tool named the IL Disassembler (ILDASM) with the .NET framework. You can use this tool to view the disassembled code for any of the http://www.wendangwang.com classes in the Temporary http://www.wendangwang.com Files directory. It lists all the methods and properties of the class and enables you to view the intermediate-level code.

　　This tool also works with all the http://www.wendangwang.com controls discussed in this chapter. For example, you can use the IL Disassembler to view the intermediate-level code for the TextBox control (located in a file named System.Web.dll).

　　Introducing http://www.wendangwang.com Controls

　　http://www.wendangwang.com controls provide the dynamic and interactive portions of the user interface for your Web application. The controls render the content that the users of your Web site actually see and interact with. For example, you can use controls to create HTML form elements, interactive calendars, and rotating banner advertisements.

　　http://www.wendangwang.com controls coexist peacefully with HTML content. Typically, you create the static areas of your Web pages with normal HTML content and create the dynamic or interactive portions with http://www.wendangwang.com controls.

　　The best way to understand how http://www.wendangwang.com controls work in an HTML page is to look at a simple Web Forms Page.

　　Adding Application Logic to an http://www.wendangwang.com Page