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Compiling XSLT Style Sheets
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In all the preceding examples, we used XSLT files directly for the purpose of transformation. If you are dealing with many style sheets, you need to keep track of each and every style sheet name during coding. You also need to deploy all the style sheets along with other project files.
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Luckily, the .NET Framework comes with a command-line XSLT compiler, xsltc.exe, that can compile one or more XSLT style sheets into an assembly. You can then load the required style sheet into the XslCompiledTransform instance and apply it to your XML documents. To illustrate the use of the XSLT compiler, let s compile the Employees.xslt that we developed earlier in this chapter. Open Visual Studio Command Prompt and issue the following command: xsltc /class:MyStyles.Employees Employees.xslt /out:EmployeeStyles.dll The /class switch is used to specify the fully qualified name of the resultant class (MyStyles.Employees in our example). The name of the XSLT style sheet follows the class name. If you wish to compile multiple style sheets, you can specify multiple pairs of class names and style sheet names. The /out switch specifies the name of the output assembly. To consume the assembly that was just created, we will modify the example shown in Figure 6-5. The modified application is shown in Figure 6-9.
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Figure 6-9. Application for testing compiled style sheets The application now accepts the fully qualified type name of the class that represents the XSLT style sheet instead of the XSLT style sheet file itself. The code inside the Click event of the Transform button now changes as shown in Listing 6-18. Listing 6-18. Loading the Compiled Style Sheet Using the XslCompiledTransform Class private void button1_Click(object sender, EventArgs e) { if(Path.GetExtension(textBox3.Text) != ".htm" && Path.GetExtension(textBox3.Text) != ".html") { MessageBox.Show("File extention must be .htm or .html"); return; } XslCompiledTransform xslt = new XslCompiledTransform(); Assembly a = Assembly.Load("EmployeeStyles"); Type t = Type.GetType(textBox2.Text); xslt.Load(t);
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xslt.Transform(textBox1.Text, textBox3.Text); if (checkBox1.Checked) { System.Diagnostics.Process.Start(textBox3.Text); } } Notice the code marked in bold. The code uses the Load() method of the Assembly class (System.Reflection namespace) to load the EmployeeStyles assembly we created earlier. Remember that you still need a reference to the EmployeeStyles assembly in your project. The code then gets a Type instance of the compiled style sheet class. It then passes this Type instance to the Load() method of the XslCompiledTransform class.
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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.
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DO.NET is a technology for accessing and manipulating databases. Disconnected data access and XML integration are the key features of ADO.NET. In this chapter, you are going to see how ADO.NET has harnessed the power of XML in data representation. Specifically, this chapter covers the following: An overview of XML integration in ADO.NET Working with SqlDataReader and XML DataSet architecture and disconnected data access XML integration in DataSet The XmlDataDocument class
Overview of ADO.NET Architecture
ADO.NET provides two ways of working with your data: Connected data access Disconnected data access
Connected Data Access
In connected data access, you establish a connection with the database. Then, as long as you are working with the data, you maintain this live connection. The following are the steps that you typically take when using connected data access: 1. Establish a connection with the database. 2. Fetch a set of records in a cursor. 3. Work with the fetched data (perform read, modify, and delete operations or even calculations). 4. Update the database, if there are any changes. 5. Close the database connection.
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