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The LINQ-Based Parsing Model of the .NET Framework
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LINQ is a set of language and .NET Framework extensions that allows you to query in-memory collections, databases, and XML documents in a unified fashion. This implies that, irrespective of the underlying data source, your code will query the data in the same way. LINQ comes in three flavors: LINQ to objects LINQ to ADO.NET LINQ to XML LINQ to objects provides a set of standard query operators for querying in-memory objects. The in-memory objects must implement the IEnumerable<T> interface. The most common objects for querying are generic List and Dictionary objects. LINQ to ADO.NET provides a set of features for working with data from relational databases. LINQ to ADO.NET comes in two flavors: LINQ to DataSet, which allows you to query ADO.NET DataSet objects, and LINQ to SQL, which allows you to query relational databases such as SQL Server. LINQ to XML is a new approach to programming with XML data. It provides the in-memory document modification capabilities of the DOM in addition to supporting LINQ query operators. LINQ to XML operations are more lightweight than traditional DOM operations. Classes such as XDocument, XElement, XNode, XAttribute, and XText provide functionality equivalent to XmlDocument and its family of classes, as you ll see later in this book.
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CHAPTER 1 INTRODUCING XML AND THE .NE T FRAM EWORK
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.NET Configuration Files
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Almost all real-world applications require configuration, which includes things such as database connection strings, file system paths, security schemes, and role-based security settings. Prior to the introduction of the .NET Framework, developers often used .ini files or the Windows registry to store such configuration settings. Unfortunately, the simple task of storing configuration settings used to be cumbersome in popular tools such as Visual Basic 6. For example, VB6 doesn t have a native mechanism to read and write to .ini files. Developers often used Windows application programming interfaces (APIs) to accomplish this. VB6 does have some features to work with the Windows registry, but they are too limited for most scenarios. Moreover, storing data in the Windows registry always comes with its own risks. In such cases, developers tend to rely on a custom solution. The impact is obvious: no standardization, more coding time, more effort, and repeated coding for the same task. Thankfully, the .NET Framework takes a streamlined and standardized approach to configuring applications. It relies on XML-based files for storing configuration information. That means developers no longer need to write custom logic to read and write to .ini files or even the Windows registry. Some of the advantages of using XML files instead of the classic approaches are as follows: Because XML files are more readable, the configuration data can be stored in a neat and structured way. To read the configuration information, the .NET Framework provides built-in classes. That means you need not write any custom code to access the configuration data. Storing the configuration information in XML files makes it possible to deploy it easily along with the application. In the past, Windows-registry based configuration posed various deployment issues. There are no dangers in manipulating the XML configuration files for your application. In the past, developer s needed to tamper with the Windows registry that is risky and often created unwanted results. .NET Framework configuration files are not limited to using the predefined XML tags. You can extend the configuration files to add custom sections. Sometimes, the configuration information includes some confidential data. .NET Framework configuration files can be encrypted easily, giving more security to your configuration data. The encryption feature is a built-in part of the framework needing no custom coding from the developer. The overall configuration files of the .NET Framework are of three types: Application configuration files Machine configuration files Security configuration files
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