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ASP. NET Web Pages-folders

This chapter provides information about folder and folder paths.

In this chapter, you will learn:

Logical folder structure and physical folder structure

Virtual name and physical name

Web URL and Web path

Logical folder structure

The following is a typical ASP. NET site folder structure:

The account folder contains login and security files

The "App_Data" folder contains databases and data files

The "Images" folder contains pictures

The "Scripts" folder contains browser scripts

The "Shared" folder contains common files (such as layouts and style files)

Physical folder structure

The physical folder structure on the computer in the "Images" folder on the above Web site may be as follows:

C:\Documents\MyWebSites\Demo\Images

Virtual name and physical name

Take the example above:

The virtual name of the site picture may be "images/pic31.jpg".

The corresponding physical name is "C:\Documents\MyWebSites\Demo\Images\pic31.jpg".

URLs and Paths

URLs are used to access files in a Web site: www.w3cschool.cc/html/html-tutorial.html

The URL corresponds to the physical file on the server: C:\MyWebSites\w3cschool\html\html-tutorial.html

A virtual path is a shorthand representation of a physical path. If you use a virtual path, you can not update the path when you change the domain name or move your page to a different server.

The root directory of the disk drive is written as C:, but the root directory of the Web site is/(slash).

The virtual path of a Web folder is typically not the same as a physical folder.

In your code, you decide to use the physical path and the virtual path, depending on your coding needs.

The ASP. Net Folder path has 3 tools: the ~ operator, the Server.MapPath method, and the Href method.

~ operator

Use the ~ operator to specify the virtual path in the programming code.

If you use the ~ operator to migrate your site to a different folder or location, you don't have to change any of your code:

var myimagesfolder = "~/images"; var mystylesheet = "~/styles/stylesheet.css";

Server.MapPath method

The Server.MapPath method transforms the virtual path (/index.html) into a physical path (C:\Documents\MyWebSites\Demo\default.html) that the server can understand.

When you need to open the data file on the server, you can use this method (only provide the full physical path to access the data file):

var pathName = "~/datafile.txt"; var fileName = Server.MapPath (pathName);

In the next chapter of this tutorial, you will learn more about reading (and writing) data files on the server.

Href method

The Href method transforms the path used in the code into a path that the browser can understand (the browser does not understand the ~ operator).

You can use the Href method to create paths to resources (like files and CSS files).

This method is typically used in the <a>, , and <link> elements in HTML:

@{var Mystylesheet = "~/shared/site.css";} <!--this creates a link to the CSS file. --><link rel= "stylesheet" type= "Text/css" href= "@Href (mystylesheet)"/><!--same as:--><link rel= " Stylesheet "type=" Text/css "href="/shared/site.css "/>

The Href method is a way to webpage an object.

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