The Generic Collection Interfaces in Visual C#

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The Generic Collection Interfaces
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25:
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Collections, Enumerators, and Iterators
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ICollection<T> defines the following methods Notice it defines a few more methods than does its non-generic counterpart
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Method void Add(T item) void Clear( ) bool Contains(T item) void CopyTo(T[ ] array, int arrayIndex) bool Remove(T item) Description Adds item to the invoking collection Throws a NotSupportedException if the collection is read-only Deletes all elements from the invoking collection and sets Count to zero Returns true if the invoking collection contains the object passed in item and false otherwise Copies the contents of the invoking collection to the array specified by array, beginning at the index specified by arrayIndex Removes the first occurrence of item from the invoking collection Returns true if item was removed and false if it was not found in the invoking collection
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PART II
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Several of these methods will throw NotSupportedException if the collection is read-only Because ICollection<T> inherits IEnumerable and IEnumerable<T>, it also includes both the generic and non-generic forms of the method GetEnumerator( ) Because ICollection<T> implements IEnumerable<T>, it supports the extension methods defined by Enumerable Although the extension methods were designed mostly for LINQ, they are available for other uses, including collections
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The IList<T> Interface
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The IList<T> interface defines the behavior of a generic collection that allows elements to be accessed via a zero-based index It inherits IEnumerable, IEnumerable<T>, and ICollection<T> and is the generic version of the non-generic IList interface IList<T> defines the methods shown in Table 25-11 Two of these methods imply the modification of a collection If the collection is read-only or of fixed size, then the Insert( ) and RemoveAt( ) methods will throw a NotSupportedException IList<T> defines the following indexer: T this[int index] { get; set; } This indexer sets or gets the value of the element at the index specified by index
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Method int IndexOf(T item) void Insert(int index, T item) void RemoveAt(int index)
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Description Returns the index of the first occurrence of item if item is contained within the invoking collection If item is not found, 1 is returned Inserts item at the index specified by index Removes the object at the index specified by index from the invoking collection
TABLE 25-11
The Methods De ned by IList<T>
Part II:
Exploring the C# Library
The IDictionary<TKey, TValue> Interface
The IDictionary<TKey, TValue> interface defines the behavior of a generic collection that maps unique keys to values That is, it defines a collection that stores key/value pairs IDictionary<TKey, TValue> inherits IEnumerable, IEnumerable<KeyValuePair<TKey, TValue>>, and ICollection<KeyValuePair<TKey, TValue>> and is the generic version of the non-generic IDictionary The methods declared by IDictionary<TKey, TValue> are summarized in Table 25-12 All throw an ArgumentNullException if an attempt is made to specify a null key IDictionary<TKey, TValue> defines the following properties:
Property ICollection Keys<TKey> { get; } ICollection Values<TValue> { get; } Description Obtains a collection of the keys Obtains a collection of the values
Notice that the keys and values contained within the collection are available as separate lists through the Keys and Values properties IDictionary<TKey, TValue> defines the following indexer: TValue this[TKey key] { get; set; } You can use this indexer to get or set the value of an element You can also use it to add a new element to the collection Notice that the index is not actually an index, but rather the key of the item
IEnumerable<T> and IEnumerator<T>
IEnumerable<T> and IEnumerator<T> are the generic equivalents of the non-generic IEnumerable and IEnumerator interfaces described earlier They declare the same methods and properties, and work in the same way Of course, the generic versions operate on data of the type specified by the type argument
Method void Add(TKey key, TValue value)
Description Adds the key/value pair specified by key and value to the invoking collection An ArgumentException is thrown if key is already stored in the collection Returns true if the invoking collection contains key as a key Otherwise, returns false Removes the entry whose key equals key Attempts to retrieve the value associated with key, putting it into value Returns true if successful and false otherwise If key is not found, value is given its default value
bool ContainsKey(TKey key) bool Remove(TKey key) bool TryGetValue(TKey key, out TValue value)
TABLE 25-12
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