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CHAPTER 18 s INTRODUCING LINQ
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What Is LINQ
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LINQ is a combination of namespaces and VB 9.0 (yes, we mean 9.0, not 8.0 or 2005) language enhancements. Through the very clever use of generics and other powerful new features of .NET 2.0 and using some functional programming techniques (like those natively available in F#), LINQ provides a high-level abstraction of virtually any data and emulates the query operations of the relational model. The LINQ Project seems to be just the beginning of many other future dramatic enhancements to .NET and .NET languages.
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s Note Throughout this book we ve called the VB language VB 2005 because Visual Basic 2005 is the name of the compiler Microsoft provides with .NET 2.0. Internally, Microsoft calls the language VB 8.0. Likewise, we ve called SQL Server SQL Server 2005 because that s the name of the product, though it s internally version 9.0. Currently, the only name for the next version of VB is VB 9.0, so that s why we ve changed nomenclature.
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These query operations are coded by using LINQ s standard query operators (SQOs), which are implemented as methods in the class Sequence in the System.Query namespace. You can call the SQO methods directly, but VB 9.0 provides syntax that is much more elegant. You just code VB and the compiler transforms your code into the appropriate method calls.
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s The source code for System.Query.Sequence.cs is provided in the LINQ download. Tip
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LINQ has three major components: LINQ to Objects LINQ to ADO.NET, which includes LINQ to DataSet (originally called LINQ over DataSet) LINQ to Entities LINQ to SQL (originally called DLinq) LINQ to XML (originally called XLinq)
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CHAPTER 18 s INTRODUCING LINQ
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LINQ to Objects deals with in-memory data. Any class that implements the IEnumerable<T> interface (in the System.Collections.Generic namespace) can be queried with SQO. LINQ to ADO.NET deals data from external sources, basically anything ADO.NET can connect to. Any class that implements IEnumerable<T> or IQueryable<T> (in the System.Query namespace) can be queried with SQO. LINQ to XML is a comprehensive API for in-memory XML programming. Like the rest of LINQ, it includes SQO, and it can also be used in concert with LINQ to ADO.NET, but its primary purpose is to unify and simplify the kinds of things that disparate XML tools, like XQuery, XPath, and XSLT, are typically used to do. In this chapter we ll preview LINQ to SQL and LINQ to DataSet, since they re most closely related to the VB database programming we ve covered in this book.
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s Note LINQ to Entities will bring LINQ to the ADO.NET Entity Framework, which combines an Entity Data
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Model with an extended version of SQL (eSQL) in yet another effort to address the data-object impedance issue. Since the Entity Framework is an ADO.NET 3.0 feature, we won t cover LINQ to Entities here.
Installing LINQ
Installing LINQ doesn t replace any .NET 2.0 assemblies, but it does change our VBE development environment, adding some new project types that support LINQ and use the VB 9.0 compiler (as you ll see later in Figure 18-7). The May 2006 LINQ CTP (Community Technology Preview) can be downloaded from the LINQ Project home page, http://msdn.microsoft.com/data/ref/linq/. Go there and click Microsoft Visual Studio Code Name Orcas - LINQ CTP (May 2006), which will take you to the download page. It s small enough to just run the download if you have a reasonably fast Internet connection, but we save it to c:\bvb2005db\install.
CHAPTER 18 s INTRODUCING LINQ
To install LINQ: 1. Run LINQ Preview (May 2006).msi, which starts the LINQ installation process. When the Welcome window appears (see Figure 18-1), click Next.
Figure 18-1. LINQ installation Welcome window
2. When the License Agreement window appears (see Figure 18-2), click the I Agree radio button and when the Next button is enabled, click it.
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