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The Non-Generic Interfaces
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SystemCollections defines a number of non-generic interfaces It is necessary to begin with the collection interfaces because they determine the functionality common to all of the non-generic collection classes The interfaces that underpin non-generic collections are summarized in Table 25-1 The following sections examine each interface in detail
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The ICollection Interface
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The ICollection interface is the foundation upon which all non-generic collections are built It declares the core methods and properties that all non-generic collections will have It also inherits the IEnumerable interface
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Interface ICollection IComparer IDictionary IDictionaryEnumerator IEnumerable IEnumerator IEqualityComparer IHashCodeProvider IList IStructuralComparable IStructuralEquatable
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Description Defines the elements that all non-generic collections must have Defines the Compare( ) method that performs a comparison on objects stored in a collection Defines a collection that consists of key/value pairs Defines the enumerator for a collection that implements IDictionary Defines the GetEnumerator( ) method, which supplies the enumerator for a collection class Provides methods that enable the contents of a collection to be obtained one at a time Compares two objects for equality Declared obsolete Use IEqualityComparer instead Defines a collection that can be accessed via an indexer Defines the CompareTo( ) method that is used for structural comparisons Defines the Equals( ) method that is used to determine structural (rather than reference) equality It also defines the GetHashCode( ) method
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TABLE 25-1
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The Non-Generic Collection Interfaces
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Exploring the C# Library
ICollection defines the following properties:
Property int Count { get; } bool IsSynchronized { get; } Meaning The number of items currently held in the collection Is true if the collection is synchronized and false if it is not By default, collections are not synchronized It is possible, though, to obtain a synchronized version of most collections An object upon which the collection can be synchronized
object SyncRoot { get; }
Count is the most often used property because it contains the number of elements currently held in a collection If Count is zero, then the collection is empty ICollection defines the following method: void CopyTo(Array array, int index) CopyTo( ) copies the contents of a collection to the array specified by array, beginning at the index specified by index Thus, CopyTo( ) provides a pathway from a collection to a standard C# array Because ICollection inherits IEnumerable, it also includes the sole method defined by IEnumerable: GetEnumerator( ), which is shown here: IEnumerator GetEnumerator( ) It returns the enumerator for the collection Because ICollection implements IEnumerable, four extension methods are defined for it They are AsParallel( ), AsQueryable( ), Cast( ), and OfType( ) AsParallel( ) is declared in SystemLinqParallelEnumerable AsQueryable( ) is declared in SystemLinqQueryable Both Cast( ) and OfType( ) are declared in SystemLinqEnumerable These methods are designed primarily to support LINQ, but may be useful in other contexts
The IList Interface
The IList interface declares the behavior of a non-generic collection that allows elements to be accessed via a zero-based index It inherits ICollection and IEnumerable In addition to the methods defined by ICollection and IEnumerable, IList defines several of its own These are summarized in Table 25-2 Several of these methods imply the modification of a collection If the collection is read-only or of fixed size, then these methods will throw a NotSupportedException Objects are added to an IList collection by calling Add( ) Notice that Add( ) takes an argument of type object Since object is a base class for all types, any type of object can be stored in a non-generic collection This includes the value types, because boxing and unboxing will automatically take place You can remove an element using Remove( ) or RemoveAt( ) Remove( ) removes the specified object RemoveAt( ) removes the object at a specified index To empty the collection, call Clear( ) You can determine whether a collection contains a specific object by calling Contains( ) You can obtain the index of an object by called IndexOf( ) You can insert an element at a specific index by calling Insert( )
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