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This code produces the following output:
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Red Orange Yellow Green Blue Purple Purple Blue Green Yellow Orange Red Purple Blue Green Yellow Orange Red
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CHAPTER 20 ENUMERATORS AND ITERATORS
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Producing Multiple Enumerators
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The previous example used iterators to produce a class with two enumerables. This example shows two things. First, it uses iterators to produce a class with two enumerators. Second, it shows how iterators can be implemented as properties rather than methods. The code declares two properties that define two different enumerators. The GetEnumerator method returns one or the other of the two enumerators, depending on the value of the Boolean variable ColorFlag. If ColorFlag is true, the Colors enumerator is returned. Otherwise, the BlackAndWhite enumerator is returned. class MyClass: IEnumerable<string> { bool ColorFlag = true; public MyClass(bool flag) { ColorFlag = flag; } IEnumerator<string> BlackAndWhite { get { yield return "black"; yield return "gray"; yield return "white"; } } // Constructor
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// Property--enumerator iterator
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IEnumerator<string> Colors // Property--enumerator iterator { get { string[] TheColors = { "blue", "red", "yellow" }; for (int i = 0; i < TheColors.Length; i++) yield return TheColors[i]; } }
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CHAPTER 20 ENUMERATORS AND ITERATORS
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public IEnumerator<string> GetEnumerator() // GetEnumerator { return ColorFlag Colors // Return Colors enumerator : BlackAndWhite; // Return BlackAndWhite enumerator } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return ColorFlag Colors // Return Colors enumerator : BlackAndWhite; // Return BlackAndWhite enumerator } } class Program { static void Main() { MyClass mc1 = new MyClass( true ); foreach (string s in mc1) Console.Write("{0} ", s); Console.WriteLine(""); MyClass mc2 = new MyClass( false ); foreach (string s in mc2) Console.Write("{0} ", s); Console.WriteLine(""); } } This code produces the following output: blue red yellow black gray white
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// Call constructor with true
// Call constructor with false
CHAPTER 20 ENUMERATORS AND ITERATORS
Behind the Scenes with Iterators
The following are some other important things to know about iterators: Iterators require the System.Collections.Generic namespace, so you should include it with a using directive. In the compiler-generated enumerators, the Reset method is not supported. It is implemented, since it is required by the interface, but the implementation throws a System. NotSupportedException exception if it is called. Notice that the Reset method is shown grayed out in Figure 20-8. Behind the scenes, the enumerator class generated by the compiler is a state machine with four states: Before: The initial state before the first call to MoveNext. Running: The state entered when MoveNext is called. While in this state, the enumerator determines and sets the position for the next item. It exits the state when it encounters a yield return, a yield break, or the end of the iterator body. Suspended: The state where the state machine is waiting for the next call to MoveNext. After: The state where there are no more items to enumerate. If the state machine is in either the before or suspended states, and there is a call to the MoveNext method, it goes into the running state. In the running state, it determines the next item in the collection, and sets the position. If there are more items, the state machine goes into the suspended state. If there are no more items, it goes into the after state, where it remains. Figure 20-11 shows the state machine.
Figure 20-11. An iterator state machine
Introduction to LINQ
What Is LINQ LINQ Providers Query Syntax and Method Syntax Query Variables The Structure of Query Expressions The Standard Query Operators LINQ to XML
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CHAPTER 21 INTRODUCTION TO LINQ
What Is LINQ
LINQ is a new feature of C# and Visual Basic .NET that integrates into these languages the ability to query data. In a relational database system, data is organized into nicely normalized tables, and accessed with a very simple but powerful query language SQL. SQL can work with any set of data in a database because the data is organized into tables, following strict rules. In a program, as opposed to a database, however, data is stored in class objects or structs that are all vastly different. As a result, there has been no general query language for retrieving data from data structures. The method of retrieving data from objects has always been customdesigned as part of the program. With the introduction of LINQ in C# 3.0, however, the ability to query collections of objects has been added to the language. The following are the important high-level characteristics of LINQ: LINQ (pronounced link) stands for Language Integrated Query. LINQ is an extension of the .NET Framework that allows you to query collections of data in a manner similar to database queries. C# 3.0 includes extensions that integrate LINQ into the language, allowing you to query data from databases, collections of program objects, and XML documents. The following code shows a simple example of using LINQ. In this code, the data source being queried is simply an array of ints. The definition of the query is the statement with the from and select keywords. Although the query is defined in this statement, it is actually performed and used in the foreach statement at the bottom. static void Main() { int[] numbers = { 2, 12, 5, 15 }; IEnumerable<int> lowNums = from n in numbers where n < 10 select n; foreach (var x in lowNums) Console.Write("{0}, ", x); } This code produces the following output:
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