外文翻譯---aspnet介紹以及內(nèi)聯(lián)代碼和共享-jsp程序-展示頁(yè)
2025-05-27 11:16本頁(yè)面
【正文】 pages), the page framework has been specifically designed to address a number of key deficiencies in the previous model. In particular, it provides the ability to create and use reusable UI controls that can encapsulate mon functionality and thus reduce the amount of code that a page developer has to write, the ability for developers to cleanly structure their page logic in an orderly fashion (not spaghetti code), and the ability for development tools to provide strong WYSIWYG design support for pages (existing classic ASP code is opaque to tools). This section of the QuickStart provides a highlevel code walkthrough of some basic page features. Subsequent sections of the QuickStart drill down into more specific details. pages are text files with an .htm file name extension. Pages consist of code and markup and are dynamically piled and executed on the server to produce a rendering to the requesting client browser (or device). They can be deployed throughout an IIS virtual root directory tree. When a browser client requests .htm resources, the runtime parses and piles the target file into a .NET Framework class. This class can then be used to dynamically process ining requests. (Note that the .htm file is piled only the first time it is accessed。 the piled type instance is then reused across multiple requests). An page can be created simply by taking an existing HTML file and changing its file name extension to .htm (no modification of code is required). For example, the following sample demonstrates a simple HTML page that collects a user39。t explicitly map to one of the controls is assigned the type of . Important: Note that these server controls automatically maintain any cliententered values between round trips to the server. This control state is not stored on the server (it is instead stored within an input type=hidden form field that is roundtripped between requests). Note also that no clientside script is required. In addition to supporting standard HTML input controls, enables developers to utilize richer custom controls on their pages. For example, the following sample demonstrates how the asp:adrotator control can be used to dynamically display rotating ads on a page. Each server control is capable of exposing an object model containing properties, methods, and events. developers can use this object model to cleanly modify and interact with the page. Note, however, how much cleaner and easier the code is in this new servercontrolbased version. As we will see later in the tutorial, the page Framework also exposes a variety of pagelevel events that you can handle to write code to execute a specific time during the processing of the page. Examples of these events are Page_Load and Page_Render. The example below demonstrates a simple page with three server controls, a TextBox, Button, and a Label. Initially these controls just render their HTML form equivalents. However, when a value is typed in the TextBox and the Button is clicked on the client, the page posts back to the server and the page handles this click event in the code of the page, dynamically updating the Text property of the Label cont
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