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14: Introducing LINQ
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6 Here is the entire example: // Use lambda expressions as event handlers using System; // Declare a delegate type for an event delegate void MyEventHandler(); // Declare a class with an event class MyEvent { public event MyEventHandler SomeEvent; // This is called to fire the event public void Fire() { if(SomeEvent != null) SomeEvent(); } } class LambdaEventHandlers { static void Main() { MyEvent evt = new MyEvent(); int count = 0; // Use lambda expressions to define event handlers // This expression lambda increments count when // the event occurs evtSomeEvent += () => count++; // This statement lambda displays the value of count // If count is greater than 3, it is reset to 0 evtSomeEvent += () => { if(count > 3) count = 0; ConsoleWriteLine("Count is " + count); }; // Fire the event five times evtFire(); evtFire(); evtFire(); evtFire(); evtFire(); } }
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(continued)
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C# 30: A Beginner s Guide
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Count Count Count Count Count is is is is is 1 2 3 0 1
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Q: A:
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Okay, I m convinced! LINQ is incredibly powerful What s the best way to begin learning more about it Begin by exploring the contents of SystemLinq Pay special attention to the capabilities of the extension methods defined by Enumerable Next, expand your knowledge and expertise in writing lambda expressions They are expected to play an increasingly important role in C# programming Also, study the collections in SystemCollections and SystemCollectionsGeneric An introduction to collections is presented in 15, but there is much more to learn Although quite new, LINQ is already an important part of C#, and its use is expected to increase with time Simply put, LINQ will be a part of every C# programmer s future The effort you put forth today will be repaid several times over
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14 Self Test
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1 What does LINQ stand for In general terms, what is its purpose 2 As it relates to LINQ, what interface must a data source implement 3 What are the query keywords that begin query clauses 4 Assuming a data source called myDataList, show how to create a query that returns a
sequence of those objects Call the query variable allData
5 Assuming that myDataList contains MyData objects and that MyData defines a property
called Height, rewrite the query for question 4 so that it returns a sequence of the Height property, rather than the entire MyData object
6 What query keyword is used to filter a sequence Use it to rewrite your answer to question 5
so that it returns only those MyData objects whose Height property is less than 100
7 What query keyword orders a sequence Using your answer for question 6, sort the results
into descending order based on the Height property
14: Introducing LINQ
8 What query keyword groups the result of a query organized into sequences (In other
words, what keyword returns a sequence of sequences ) Show its general form
9 What keyword joins two sequences Show its general form in the context of a from clause 10 When using select or group, what keyword creates a continuation 11 What keyword creates a variable that holds a value 12 Show how to create an instance of an anonymous type that has two string properties called
Title and Author
13 What is the lambda operator 14 A lambda expression is one form of anonymous function True or False 15 What is the query method that corresponds to the where keyword 16 What is an extension method How must the first parameter be declared 17 Why are extension methods important to LINQ
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The Preprocessor, RTTI, Nullable Types, and Other Advanced Topics
Copyright 2009 by The McGraw-Hill Companies Click here for terms of use
C# 30: A Beginner s Guide
Key Skills & Concepts
Preprocessor Runtime type identification Nullable types Unsafe code Attributes Conversion operators Collections Additional keywords
ou have come a long way since the start of this book This, the final chapter, examines several C# topics, such as the preprocessor, runtime type ID, and nullable types, that don t fit easily into any of the preceding chapters It also introduces collections, gives an overview of unsafe code, and shows how to create a conversion operator The chapter concludes with a brief look at the remaining C# keywords that are not covered elsewhere Many of the topics in this chapter apply to advanced uses of C#, and detailed discussions of these topics are outside the scope of this book They are introduced here so that you will have a full picture of what is available in C#
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