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Embedding scripts in the style sheet does indeed provide a handy way to perform operations that are beyond the capabilities of XSLT. However, it doesn t provide a good mechanism for reusing your code. What if you wish to use the same function elsewhere in the application or in other style sheets This is where extension objects come into the picture. Simply put, extension objects are objects external to the style sheet that provide some functionality to the style sheet. Extension objects promote greater code reuse and are more flexible and maintainable than embedded script blocks. To illustrate the use of extension objects, we will modify our previous example. First, we will put the GetBirthDate() function in a separate class called Employee rather than embedding it in the style sheet. The newly created Employee class should look similar to Listing 6-16. Listing 6-16. Placing the GetBirthDate() Function in a Class class Employee { public string GetBirthDate(int employeeid) { SqlConnection cnn = new SqlConnection(@"data source=.\sqlexpress;initial catalog=northwind;integrated security=true"); SqlCommand cmd = new SqlCommand(); cmd.Connection = cnn; cmd.CommandText = "SELECT birthdate FROM employees WHERE employeeid=@id"; SqlParameter pDOB = new SqlParameter("@id", employeeid); cmd.Parameters.Add(pDOB); cnn.Open(); object obj = cmd.ExecuteScalar(); cnn.Close(); DateTime dob = DateTime.Parse(obj.ToString()); return dob.ToString("MM/dd/yyyy"); } } The function by itself is the same that we used before but it has been encapsulated in the Employee class. Next you need to modify the Click event handler of the Transform button to resemble Listing 6-17.

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VaryByHeader: Used to vary the output cache by the value of different HTTP headers When you set the value of VaryByHeader to a list of HTTP headers (separated by semicolons), multiple versions of the page are cached depending on the values of the mentioned headers A typical value for VaryByHeader is "Accept-Language", which instructs ASPNET to cache multiple versions of the page for different languages VaryByParam: Varies the output cache based on the values of the parameters passed to the server, which include the query string parameters You ll see in the exercise how to vary the output page cache based on the query string parameters You can enable output caching for DepartmentsListascx by editing the file in HTML View and adding the following line at the beginning of the file: <%@ OutputCache Duration="1000" VaryByParam="DepartmentIndex" %> After adding this directive, ASP.

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Listing 6-17. Using Extension Objects private void button1_Click(object sender, EventArgs e) { XsltSettings settings = new XsltSettings(); settings.EnableScript = true; XslCompiledTransform xslt = new XslCompiledTransform(); xslt.Load(textBox2.Text,settings,null); XsltArgumentList arguments = new XsltArgumentList(); Employee employee = new Employee(); arguments.AddExtensionObject("urn:myscripts", employee); FileStream stream = new FileStream(textBox3.Text, FileMode.Create); xslt.Transform(textBox1.Text, arguments,stream); stream.Close(); if (checkBox1.Checked) { System.Diagnostics.Process.Start(textBox3.Text); } } Notice the code marked in bold. After loading the style sheet by using the Load() method as before, it creates an instance of the XsltArgumentList class, which we used when passing parameters to the style sheet. This time, however, the code uses the AddExtensionObject() method of the XsltArgumentList class. This method accepts the namespace URI and an instance of the extension object. In our case, the Employee class instance acts as an extension object. While calling the Transform() method of XslCompiledTransform, the XsltArgumentList object is passed to it. If you run the application now, you should get a result identical to the previous example.

NET retains the different output versions of DepartmentsList ascx, depending on the value of the DepartmentIndex query string parameter..

6. 7. 8. 9.

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Caution Implementing output caching can easily affect the behavior of your web site in unexpected ways. Also, the way output caching should be implemented depends on the exact stage of your web site. For now, you shouldn t use output caching, but only keep its possibilities in mind. You can start improving performance and tweaking your Web Forms or Web User Controls after you have a working web application.


For controls whose output also depends on the CategoryIndex, such as CategoriesList. ascx and Catalog.ascx, you can implement caching like this: <%@ OutputCache Duration="1000" VaryByParam="DepartmentIndex;CategoryIndex" %> Because ProductsList.ascx has many output versions (especially if you take searching into account), it s not recommended to implement caching for it. However, if you still want to do this, you need to make it vary on every possible query string parameter that could influence its output, with an OutputCache directive like this: <%@ OutputCache Duration="1000" VaryByParam="DepartmentIndex;CategoryIndex;Search;AllWords;PageNumber; ProductsOnPage" %> Alternatively, the * wildcard can be used to vary the output cache on any possible query string parameter: <%@ OutputCache Duration="1000" VaryByParam="*" %>

This chapter gave you a detailed understanding of XSLT processing in .NET. By using XSLT style sheets, XML data can be transformed from one form to another. The XslCompiledTransform class represents the .NET Framework s XSLT processor. It allows you to load the style sheets and apply them to source XML. You can also pass parameters while transformation is being carried out, by using the XsltArgumentList class. The XslCompiledTransform class also allows you to embed script blocks. A better way to use your code is to create extension objects, which are more flexible and maintainable than embedded script blocks.

Note You can test caching to make sure it actually works by either placing breakpoints in code (the code shouldn t execute at all when caching is enabled) or temporarily stopping SQL Server and then browsing through pages that were stored in cache (although for this to work, you ll need to implement caching on all the controls that perform data access).

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