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You can write LINQ queries against the .NET Framework arrays. The following example shows an array of strings. You can then see the LINQ query that is written against this array. Notice that the range variable (emp) used in the From clause gets automatically defined as a string because the array includes string values. You can iterate over the underlying collection defined by the LINQ query by using an iterative technique such as For Each.
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Sample of Visual Basic Code Dim employees As String() = {"Michael", "Hank", "Benjamin", "Gail"} Dim empQuery = From emp In employees Where emp.Length > 5 Select emp Sample of C# Code string[] employees = {"Michael", "Hank", "Benjamin", "Gail"}; var empQuery = from emp in employees where emp.Length > 5 select emp;
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Connecting to and Querying Data with LINQ
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LIST DATA
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You can use LINQ to query against data stored in a collection class, such as the List<T> class (among many others). The following code creates a new List<Employee> collection. The Employee class is simply a custom class that was written to hold a few properties. The code then defines a simple LINQ query against the class. You can then iterate over the collection defined by the query.
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Sample of Visual Basic Code Dim employees As List(Of Employee) = New List(Of Employee) From {New Employee With {.First = "Michael", .ID = 111, .Department = "IT Department", .City = "Pittsburgh"}, New Employee With {.First = "Hank", .ID = 112, .Department = "IT Department", .City = "Redmond"}, New Employee With {.First = "Benjamin", .ID = 113, .Department = "Human Resources", .City = "Chicago"}, New Employee With {.First = "Gail", .ID = 113, .Department = "Marketing", .City = "Ann Arbor"} } Dim empQuery As IEnumerable(Of Employee) = From emp In employees Where emp.First.Length > 5 Select emp Sample of C# Code List<Employee> employees = new List<Employee>() { new Employee {First="Michael", ID=111, Department="IT Department", City="Pittsburgh"}, new Employee {First="Hank", ID=112, Department="IT Department", City="Redmond"}, new Employee {First="Benjamin", ID=113, Department="Human Resources", City="Chicago"}, new Employee {First="Gail", ID=114, Department="Marketing", City="Ann Arbor"}, }; IEnumerable<Employee> empQuery = from emp in employees where emp.First.Length > 5 select emp;
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Lesson 1: Getting Started with LINQ
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XML DATA
You can use LINQ to query XML data sources too. In this case, you actually use the language features of LINQ to write your queries. However, to work with the data, you use LINQ to XML (defined in System.Xml.Linq). This namespace makes working with XML data easier and exposes your XML so that LINQ can query the XML data. For example, the following code uses the XElement class to load an XML file that can easily be queried by LINQ.
Sample of Visual Basic Code Dim empXml As XElement = XElement.Load("c:\code\employees.xml") Sample of C# Code XElement empXml = XElement.Load(@"c:\code\employees.xml");
You can also use the XElement class to actually create XML on the fly. The following code shows just that. Notice that the Visual Basic code uses the Visual Basic XML literals feature to create the XML in code. The C# example relies on the XElement constructors for creating the XML. Notice also the LINQ query against the XML. This is a query of a collection of XElement objects. To access actual items within the XML, you use the Descendants or Element properties.
Sample of Visual Basic Code Dim empXml As XElement = New XElement( <Employees> <Employee> <ID>111</ID> <FirstName>Michael</FirstName> <Department>IT Department</Department> <City>Pittsburgh</City> </Employee> <Employee> <ID>112</ID> <FirstName>Hank</FirstName> <Department>IT Department</Department> <City>Redmond</City> </Employee> <Employee> <ID>113</ID> <FirstName>Benjamin</FirstName> <Department>Human Resources</Department> <City>Chicago</City> </Employee> <Employee> <ID>114</ID> <FirstName>Gail</FirstName> <Department>Marketing</Department> <City>Ann Arbor</City> </Employee> </Employees>) Dim empQuery As IEnumerable(Of XElement) = From emp In empXml.Descendants("Employee") Where emp.Element("FirstName").Value.Length > 5 Select emp
630 ChAPTER 11
Connecting to and Querying Data with LINQ
Sample of C# Code XElement empXml = new XElement("Employees", new XElement("Employee", new XElement("ID", "111"), new XElement("FirstName", "Michael"), new XElement("Department", "IT Department"), new XElement("City", "Pittsburgh") ), new XElement("Employee", new XElement("ID", "112"), new XElement("FirstName", "Hank"), new XElement("Department", "IT Department"), new XElement("City", "Redmond") ), new XElement("Employee", new XElement("ID", "113"), new XElement("FirstName", "Benjamin"), new XElement("Department", "Human Resources"), new XElement("City", "Chicago") ), new XElement("Employee", new XElement("ID", "114"), new XElement("FirstName", "Gail"), new XElement("Department", "Marketing"), new XElement("City", "Ann Arbor") ) ); IEnumerable<XElement> empQuery = from emp in empXml.Descendants("Employee") where emp.Element("FirstName").Value.Length > 5 select emp;
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