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A Brief Introduction to Collections
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One of the most important parts of the NET Framework is collections As it relates to C#, a collection is a group of objects The NET Framework contains a large number of interfaces and classes that define and implement various types of collections Collections simplify many programming tasks because they supply off-the-shelf solutions to several common, but sometimes tedious-to-develop, data structures For example, there are built-in collections that support dynamic arrays, linked lists, stacks, queues, and hash tables Containing both generic and non-generic collection classes, the Collections API is very large It isn t possible to fully describe its contents or illustrate its use here However, because collections are an increasingly important part of C# programming, they are a feature that you need to be aware of Towards this end, this section provides a brief introduction to this important subsystem As you advance in your study of C#, collections are definitely a feature that you will want to study further
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The principal benefit of collections is that they standardize the way groups of objects are handled by a program All collections are designed around a set of cleanly defined interfaces Several built-in implementations of these interfaces are provided, which you can use as-is You can also implement your own collection, but you will seldom need to As mentioned, the NET Framework defines both generic and non-generic collections The original 10 release contained only non-generic collections, but the generic collections were
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The Preprocessor, RTTI, Nullable Types, and Other Advanced Topics
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added by the 20 release Although both are still used, new code should focus on the generic collections because they are type-safe (The original, non-generic collections store object references, which makes them vulnerable to type mismatch errors) The non-generic collection classes and interfaces are declared in SystemCollections Generic collections are declared in SystemCollectionsGeneric Since the generic collections have largely superseded the nongeneric collections, they are the only type of collections described here The basic functionality of the collections is defined by the interfaces that they implement For generic collections, the foundation is the ICollection<T> interface, which is implemented by all generic collections It inherits IEnumerable<T> (which extends IEnumerable) and defines the methods shown here:
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void Add(T obj) void Clear( ) bool Contains(T obj) void CopyTo(T[ ] target, int startIdx)
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Adds obj to the invoking collection Deletes all elements from the invoking collection Returns true if the invoking collection contains the object passed in obj and false otherwise Copies the contents of the invoking collection to the array specified by target, beginning at the index specified by startIdx Returns the enumerator for the collection (Specified by IEnumerable<T>) Returns the non-generic enumerator for the collection (Specified by IEnumerable) Removes the first occurrence of obj from the invoking collection Returns true if obj was removed and false if it was not found in the invoking collection
IEnumerator<T> GetEnumerator( ) IEnumerator GetEnumerator( ) bool Remove(T obj)
Methods that modify a collection will throw NotsupportedException if the collection is read-only ICollection<T> also defines the following properties: int Count { get; } bool IsReadOnly { get; } Count contains the number of items currently held in the collection IsReadOnly is true if the collection is read-only It is false if the collection is read/write Because ICollection<T> inherits the IEnumerable<T> interface, it ensures that all of the collections classes can be enumerated (cycled through one element at a time) Furthermore, inheriting IEnumerable<T> allows a collection to be used as a data source for queries or iterated by the foreach loop (Recall that only instances of objects that implement IEnumerable or IEnumerable<T> can be used as a data source for a query) Because collections implement IEnumerable<T>, they also support the extension methods defined for IEnumerable<T> (see 14)
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