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Using this template and the XslTransform class (contained in the System.Xml.Xsl namespace), you can transform the DVD list into formatted HTML. Here s the code that performs this transformation and saves the result to a new file: string xslFile = Server.MapPath("DvdList.xsl"); string xmlFile = Server.MapPath("DvdList.xml"); string htmlFile = Server.MapPath("DvdList.htm"); XslCompiledTransform transf = new XslCompiledTransform(); transf.Load(xslFile); transf.Transform(xmlFile, htmlFile); Of course, in a dynamic web application you ll want to transform the XML file and return the resulting code directly, without generating an HTML file. To do this you have to create an XPath-Navigator for the source XML file. You can then pass the XPathNavigator to the XslTranform.Transform() method, and retrieve the results in any stream object. The following code demonstrates this technique: // Create an XPathDocument. XPathDocument xdoc = new XPathDocument(new XmlTextReader(xmlFile)); // Create an XPathNavigator. XPathNavigator xnav = xdoc.CreateNavigator(); // Transform the XML. MemoryStream ms = new MemoryStream(); XsltArgumentList args = new XsltArgumentList(); transf.Transform(xnav, args, ms);

CreateDirectory()

Delete()

Once you have the results in a MemoryStream, you can create a StreamReader to retrieve them as a string: StreamReader r = new StreamReader(ms); ms.Position = 0; Response.Write(r.ReadToEnd()); r.Close(); Figure 12-8 shows the resulting page.

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Creates a new directory. If you specify a directory inside another nonexistent directory, ASP.NET will thoughtfully create all the required directories. Deletes the corresponding empty directory. To delete a directory along with its contents (subdirectories and files), add the optional second parameter of true. Returns true or false to indicate whether the specified directory exists. Returns a DateTime object that represents the time the directory was created, accessed, or written to. Each Get method has a corresponding Set method, which isn t shown in this table. Returns an array of strings, one for each subdirectory, file, or drive in the specified directory (depending on which method you re using). This method can accept a second parameter that specifies a search expression (such as ASP*.*). Drive letters are in the format of c:\.

Refresh()

In some cases you might want to combine transformed HTML output with other content and web controls. In this case, you can use the Xml control. The Xml control displays the result of an XSL transformation in a discrete portion of a page.

Delete()

Create() MoveTo()

You can then retrieve it with an appropriate conversion operation: ds = (DataSet)Session["ds"]; Session state is global to your entire application for the current user. Session state can be lost in several ways: If the user closes and restarts the browser. If the user accesses the same page through a different browser window, although the session will still exist if a web page is accessed through the original browser window. Browsers differ on how they handle this situation. If the session times out because of inactivity. By default, a session times out after 20 idle minutes. If the programmer ends the session by calling Session.Abandon(). In the first two cases, the session actually remains in memory, because the web server has no idea that the client has closed the browser or changed windows. The session will linger in memory, remaining inaccessible, until it eventually expires. In addition, session state will be lost when the application domain is re-created. This process happens transparently when you update your web application or change a configuration setting. The application domain may also be recycled periodically to ensure application health, as described in 18. If this behavior is causing a problem, you can store session state information out of process, as described in the next section. With out-of-process state storage, the session information is retained even when the application domain is shut down. Table 6-4 describes the methods and properties of the HttpSessionState class. Table 6-4. HttpSessionState Members

Exists() GetCreationTime(), GetLastAccessTime(), and GetLastWriteTime() GetDirectories(), GetFiles(), and GetLogicalDrives()

In addition, the FileInfo and DirectoryInfo classes have a couple of unique members, as indicated in Table 13-4 and Table 13-5. Table 13-4. Unique DirectoryInfo Members

The number of items in the current session collection. Identifies whether this session is tracked with a cookie or with modified URLs. Identifies whether this session was just created for the current request. If there is currently no information in session state, ASP.NET won t bother to track the session or create a session cookie. Instead, the session will be re-created with every request. Provides an enumerated value that explains how ASP.NET stores session state information. This storage mode is determined based on the web.config configuration settings discussed later in this chapter. Provides a string with the unique session identifier for the current client. Provides a collection of read-only session items that were declared by <object runat=server> tags in the global.asax. Generally, this technique isn t used and is a holdover from ASP programming that is included for backward compatibility. The current number of minutes that must elapse before the current session will be abandoned, provided that no more requests are received from the client. This value can be changed programmatically, giving you the chance to make the session collection longer term when required for more important operations.

GetParent()

Parent and Root CreateSubdirectory()

Abandon()

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