qr code c# mvc Lesson 1: Collecting Data Items in Visual C#

Encode QR Code 2d barcode in Visual C# Lesson 1: Collecting Data Items

Lesson 1: Collecting Data Items
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Lesson Summary
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The .NET Framework supports a variety of collection classes that can be used in different circumstances. The ArrayList is a simple collection of unordered items. The Add and AddRange methods of the ArrayList are used to add items to an ArrayList. The Insert and InsertRange methods of the ArrayList are used to insert items into specific places in a collection. The Remove, RemoveAt, and RemoveRange methods of the ArrayList are used to delete items from a collection. The indexer of the ArrayList can be used to iterate over a collection. The IEnumerable and IEnumerator interfaces can be used to enumerate through a collection as well. The foreach construct in Visual Basic and C# use the IEnumerable interface to concisely iterate over a collection.
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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 1, Collecting Data Items. The questions are also available on the companion CD if you prefer to review them in electronic form.
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NOTE Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which of the following ArrayList methods can be used to determine whether an item exists in the collection (Choose all that apply.) A. Remove B. Contains C. IndexOf D. Count
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Collections and Generics
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2. What is the Comparer class used for (Choose all that apply.) A. To compare two objects, usually for sorting B. To test whether two objects are the same reference of an object C. To sort an ArrayList in the ArrayList.Sort method D. To provide a default implementation of the IComparer interface
Lesson 2: Working with Sequential Lists
Lesson 2: Working with Sequential Lists
Not all collections are created equal. At times, it makes more sense to deal with a list of objects as a sequential list of items rather than accessing them individually.
After this lesson, you will be able to:
Create and use a first-in, first-out (FIFO) collection Create and use a last-in, first-out (LIFO) collection.
Estimated lesson time: 10 minutes
What Are Sequential Lists
Often collections are simply a set of objects that need to be dealt with in an orderly way. For example, you might create a class that accepts objects to perform some work against. Depending on the specific requirements, you are likely to need to access the objects just one at a time and process them. Having access to items in the middle of the list has very little use for your class. Instead of using a collection such as ArrayList, the .NET Framework exposes two classes whose job it is to store data as a list and simply allow access to those objects as they are needed. The Queue and Stack classes are meant to be used to store data in a sequential basis.
The Queue Class
The Queue class is a collection for dealing with first-in, first-out (FIFO) handling of sequential objects. The interface to the Queue class is very simple: it supports putting items into the queue and pulling them out. The Queue class works quite differently than the ArrayList shown in Lesson 1. Specifically, accessing and removing items from the collection were two different operations in the ArrayList. The Queue combines these operations in the Dequeue method. The operations are combined primarily because the Queue class is meant to be used to create lists of objects to work with in some way. As its name suggests, the Queue treats objects like customers in line at the bank. It cares only about who is next and where to add people at the end of the line. The most important properties and methods of the Queue class are shown in Table 4-9 and Table 4-10, respectively.
4
Collections and Generics
Table 4-9
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