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differences between LINQ on the .NET Framework and LINQ on the .NET Compact Framework is that on the .NET Compact Framework, only SQOs are supported. LINQ to DataSets and LINQ to DataTables are supported, and LINQ to XML is also supported except for XPath extensions.
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In this chapter, we ll work with the three techniques LINQ to Objects, LINQ to SQL, and LINQ to DataSets, since they re most closely related to the Visual Basic 2008 database programming we ve covered in this book.
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LINQ Project Structure
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Visual Studio 2008 allows you to use LINQ queries, and to create a LINQ project, follow these steps: 1. Open Visual Studio 2008 and select File New Project. 2. In the New Project dialog box that appears, by default .NET Framework 3.5 is chosen in the list of available .NET Framework versions supported by Visual Studio 2008. Select the type of project you would like the LINQ feature to be part of. For example, we will be using a Console Application project (see Figure 19-2). 3. Type the name 19 for the chosen project and click OK. The new Console Application project named 19 will appear. In a Visual Basic Console Application, the LINQ namespaces are added under the References folder in Solution Explorer, as shown in Figure 19-3. Now you are ready to work with a LINQ project, and all you need to do is add the code functionality and required namespaces to the project and test the application. Let s begin using LINQ.
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CHAPTER 19 s USING LINQ
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Figure 19-2. Choosing a LINQ-enabled Console Application project
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Figure 19-3. LINQ references
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Using LINQ to Objects
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The term LINQ to Objects refers to the use of LINQ queries to access in-memory data structures. You can query any type that supports IEnumerable(Of T). This means that you can use LINQ queries not only with user-defined lists, arrays, dictionaries, and so on, but also in conjunction with .NET Framework APIs that return collections. For example, you can use the
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CHAPTER 19 s USING LINQ
System.Reflection classes to return information about types stored in a specified assembly, and then filter those results by using LINQ. Or you can import text files into enumerable data structures and compare the contents to other files, extract lines or parts of lines, group matching lines from several files into a new collection, and so on. LINQ queries offer three main advantages over traditional For Each loops: They are more concise and readable, especially when filtering multiple conditions. They provide powerful filtering, ordering, and grouping capabilities with a minimum of application code. They can be ported to other data sources with little or no modification. In general, the more complex the operation you want to perform on the data, the greater the benefit you will realize by using LINQ as opposed to traditional iteration techniques.
Try It Out: Coding a Simple LINQ to Objects Query
In this exercise, you ll use LINQ to Objects to retrieve some names from an array of strings. 1. Right-click the 19 project in the 19 solution, select the Rename option, and rename the project to LinqToObjects. Rename Module1.vb to LinqToObjects.vb. Replace the code in LinqToObjects.vb with the code in Listing 19-1. Listing 19-1. LinqToObjects.vb Imports Imports Imports Imports System System.Text System.Linq System.Collections.Generic
Namespace 19 Class LinqToObjects Shared Sub Main(ByVal args As String()) Dim names As String() = {"James Huddleston", "Pearly", _ "Rupali Agarwal", "Fabio Claudio", "Vamika Agarwal", _ "Sofia Merchant", "Vidya Vrat Agarwal"} 'Dim name As String Dim namesOfPeople As IEnumerable(Of String) = _ From name In names _ Where (name.Length <= 16) _ Select name
CHAPTER 19 s USING LINQ
For Each name In namesOfPeople Console.WriteLine(name) Next End Sub End Class End Namespace 2. Run the program by pressing Ctrl+F5, and you should see the results shown in Figure 19-4.
Figure 19-4. Retrieving names from a string array using LINQ to Objects
How It Works
You declare a string array called names: Dim names As String() = {"James Huddleston", "Pearly", _ "Rupali Agarwal", "Fabio Claudio", "Vamika Agarwal", _ "Sofia Merchant", "Vidya Vrat Agarwal"} In order to retrieve names from the string array, you query the string array using IEnumerable(Of String) and also loop through the names array with the help of For Each using the LINQ to Objects query syntax: Dim namesOfPeople As IEnumerable(Of String) = _ From name In names _ Where (name.Length <= 16) _ Select name For Each name In namesOfPeople Console.WriteLine(name) Next
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