ASP.NET: Tips, Tutorials, and Code CHAPTER 2

Аннотация

Dictionary object, a collection object that references each element with a textual key. A collection that stores objects in this fashion is known as a hash table.There are many types of collections in addition to the hash table. Each type of collection is similar in purpose: it serves as a means to store a varying number of elements, providing an easy way, at a minimum, to add and remove elements. Each different type of collection is unique in its method of storing, retrieving, and referencing its various elements. The .NET Framework provides a number of collection types for the developer to use. In fact, an entire namespace, System.Collections, is dedicated to collection types and helper classes. Each of these collection types can store elements of type Object. Most of the examples in this section use collections to house primitive data types (strings, integers, doubles). However, Listing 2.1 illustrates a collection of collections—that is, a collection type that stores entire collections as each of its elements! With a foreword by Microsofts Mark Anders, Professional ASP.NET consists of 19 chapters written by seven of todays leading experts in ASP.NET. These authors are professional developers who create ASP.NET applications, teach, run well-known ASP.NET Web sites, either within or outside of Microsoft. The tutorial framework for each chapter includes: *A brief introduction, explaining the concept.*A code example, illustrating the concept.*A piece-by-piece explanation of the code.Most examples employ VB.NET, but there are also additional C SHARP examples within each chapter, and all of the example programs will be available at the books web site in both VB.NET and C SHARP.The code examples in this book are based upon the ASP.NET Beta2 specifications, a functionally complete version of the software