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C# 30: A Beginner s Guide
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// Create a queue for chars and a queue for doubles SimpleQueue<char> charQ = new SimpleQueue<char>(10); SimpleQueue<double> doubleQ = new SimpleQueue<double>(5); char ch; double d; int i; try { // Use a char queue for(i=0; i < 10; i++) { ConsoleWriteLine("Storing: " + (char) ('A' + i)); charQPut((char) ('A' + i)); } ConsoleWriteLine(); for(i=0; i < 10; i++) { ConsoleWrite("Getting next char: "); ch = charQGet(); ConsoleWriteLine(ch); } } catch (QueueFullException exc) { ConsoleWriteLine(exc); } ConsoleWriteLine(); try { // Use a double queue for(i=1; i <= 5; i++) { ConsoleWriteLine("Storing: " + i * 31416 ); doubleQPut(i * 31416); } ConsoleWriteLine(); for(i=0; i < 5; i++) { ConsoleWrite("Getting next double: "); d = doubleQGet(); ConsoleWriteLine(d); } } catch (QueueEmptyException exc) { ConsoleWriteLine(exc); } } }
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13: Generics
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Storing: Storing: Storing: Storing: Storing: Storing: Storing: Storing: Storing: Storing: Getting Getting Getting Getting Getting Getting Getting Getting Getting Getting Storing: Storing: Storing: Storing: Storing: Getting Getting Getting Getting Getting A B C D E F G H I J next next next next next next next next next next char: char: char: char: char: char: char: char: char: char: A B C D E F G H I J
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31416 62832 94248 125664 15708 next next next next next double: double: double: double: double: 31416 62832 94248 125664 15708
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13 Self Test
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1 Generics streamline the creation of classes that work with various kinds of data in a type-
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2 What is a type parameter 3 What is a type argument
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C# 30: A Beginner s Guide
4 As explained, generalized code was possible in C# prior to the addition of generics
through the use of object references One problem with this approach is the tedium and the possibility of errors associated with supplying the required casts What is the other problem
5 What does a base class constraint do What does a value type constraint do 6 Can interfaces be generic 7 How do you create a default value for a type 8 When creating a generic method, where is the type parameter list specified 9 Can generic methods use type constraints 10 As mentioned, although generic properties cannot be created, a property can use a type
parameter from its enclosing scope Rework the ITwoDCoord interface and the XYCoord class shown in the chapter so that they convert methods such as GetX( ) and GetY( ) into properties
Introducing LINQ
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C# 30: A Beginner s Guide
Key Skills & Concepts
LINQ fundamentals Type correspondence in a query Filter values with where Sort results with orderby Select values with select Group results with group Use into to create a continuation Join two sequences with join Anonymous types and object initializers Create a group join Use let to create a variable in a query The query methods Deferred VS immediate query execution Lambda expressions Extension methods
f the addition of generics in the 20 release had a profound effect on C# (which it did), then the addition of LINQ in version 30 is nothing short of earth-shaking! Without question, LINQ is the single most important new feature in C# 30 It adds an entirely new syntactic element, several new keywords, and a powerful new capability The inclusion of LINQ has significantly increased the scope of the language, expanding the range of tasks to which C# can be applied Simply put, with the inclusion of LINQ, C# has set a new standard, which will affect the course of language development well into the future LINQ is that important
14: Introducing LINQ
NOTE
As was the case with generics described in the preceding chapter, the subject of LINQ is quite large, involving many features, options, and alternatives It is not possible to cover all of its aspects in this beginner s guide (In fact, a complete description of LINQ requires an entire book of its own!) This chapter explains its theory, core concepts, and basic syntax It also shows several examples that illustrate LINQ s use After completing this chapter, you will be able to begin using LINQ in your programs However, it is a subsystem that you will almost certainly want to explore in greater detail
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