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When you build ASP.NET web applications, you will often need to interact with IIS. Be aware, however, that IIS is not automatically selected when you install the Windows Server 2003 or Windows XP Professional Edition (you can’t install IIS on the Home editions of Windows). Therefore, depending on the configuration of your development machine, you may be required to manually install IIS before proceeding through this chapter. To do so, simply access the Add/Remove Program applet from the Control Panel folder and select Add/Remove Windows Components.
Working with IIS Virtual Directories
A single IIS installation is able to host numerous web applications, each of which resides in a virtual directory. Each virtual directory is mapped to a physical directory on the local hard drive. Therefore, if you create a new virtual directory named CarsRUs, the outside world can navigate to this site using a URL such as http://www.CarsRUs.com (assuming your site’s IP address has been registered with the world at large). Under the hood, the virtual directory maps to a physical root directory such as C:\inetpub\wwwroot\AspNetCarsSite, which contains the content of the web application.
When you create ASP.NET web applications using Visual Studio 2005, you have the option of generating a new virtual directory for the current website. However, you are also able to manually create a virtual directory by hand. For the sake of illustration, assume you wish to create a simple web application named Cars. The first step is to create a new folder on your machine to hold the collection of files that constitute this new site (e.g., C:\CodeTests\CarsWebSite).
Next, you need to create a new virtual directory to host the Cars site. Simply right-click the Default Web Site node of IIS and select New ➤Virtual Directory from the context menu. This menu selection launches an integrated wizard. Skip past the welcome screen and give your website a name (Cars). Next, you are asked to specify the physical folder on your hard drive that contains the various files and images that represent this site (in this case, C:\CodeTests\CarsWebSite).
The final step of the wizard prompts you for some basic traits about your new virtual directory (such as read/write access to the files it contains, the ability to view these files from a web browser, the ability to launch executables [e.g., CGI applications], etc.). For this example, the default selections are just fine (be aware that you can always modify your selections after running this tool using various right-click Property dialog boxes integrated within IIS).
ASP.NET 2.0网页和Web控件
到现在为止，本书的示例应用程序主要集中在控制台和基于Windows窗体前端。在本章及下面学习中，将探讨如何用.NET平台促进浏览器的建设。首先，你很快就会再次看到关于网络中心的概念（HTTP，HTML格式，客户端和服务器端脚本）和web服务器（包括ASP.NET开发服务器，WebDev.WebServer作用。exe文件）。
了这一点，本章的剩余部分主要是ASP网络（包括增强的代码隐藏模型），以及如何使用ASP.NET Web控件和ASP.NET组成。正如你所看到的，ASP.NET 2.0提供了一些新的网络控制模式，新的“母版页”的模式，以及各种定制技术。论文网
HTTP的作用
Web应用程序不同于传统的桌面应用程序。第一个明显不同的是，产生Web应用程序将至少涉及两台联网的机器（当然在开发过程中完全有可能有一台机器扮演客户端和服务器角色）。鉴于这一事实，机器必须确定一个特定的有线协议，以确定如何发送和接收数据。线路协议,关系到计算机的问题是超文本传递协议（HTTP）。
当客户机启动一个（如Netscape Navigator，Mozilla Firefox浏览器，或Microsoft Internet Explorer）浏览器，一个HTTP请求访问（如*. aspx或*. htm文件）在远程服务器上的特定资源。 HTTP是一个基于文本的协议，是建立在一个标准的请求/响应式。例如，如果导航到http://www.IntertechTraining.com，浏览器软件利用网络技术网域名称服务（DNS）转换成由四个部分组成，32位数值（又名IP地址）注册的网址。此时，浏览器打开一个（通常是通过端口80）套接字连接和发送的默认HTTP网页上http://www.IntertechTraining.com要求。
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