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Interfaces related to data collections Interface Description Interface that supports the creation of an enumerator class for iterating over the elements in a collection.
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Supporting this interface allows the C# foreach statement to be used with instances of a class or structure. Interface for stepping through the elements in a collection.
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Current property, to retrieve the current element from the collection. MoveNext method, which advances to the next element in the collection. Reset method, which sets the
enumerator just before the first element. An IEnumerable interface that provides sizing and synchronization capabilities. This interface is the basis for all collections in the .NET Framework.
Count property, to retrieve the number
of elements in the collection.
SyncRoot property, to retrieve an object for synchronizing multi-threaded access to the collection. CopyTo method, which copies the elements in the collection into an Array object.
ICollection
An ICollection interface that provides indexing of its elements.
Usage
IList
Item property, to support array-style
indexing of elements using [brackets], much like a [] override in C++.
Add method, which adds a new element
Supporting this interface allows a class or structure to be treated as an array. This permits objects to be used as targets of data bound controls, as discussed in chapter 17 .
to the collection.
Contains method, which determines if
the collection contains a specific object.
Remove method, to remove the element from the collection at a given index value.
DATA COLLECTION CLASSES Looking over the interfaces in the table, the IList interface seems particularly appropriate for the task at hand. This allows elements to be added and removed from the collection, and supports array-style indexing. Some of the data collection classes in the .NET Framework are shown in the following table. Note, in particular, those classes in the table that support the IList interface.
C# CLASSES AND INTERFACES
Some .NET classes related to data collections Class
Array
Description The base class for all array objects. This class is abstract. A dynamically-sized array. An abstract class for creating a strongly typed collection. A customized view of a database table.
Interfaces supported
ICloneable, IList, ICollection, IEnumerable ICloneable, IList, ICollection, IEnumerable IList, ICollection, IEnumerable IList, ICollection, IEnumerable, and others
ArrayList
CollectionBase
DataView
Hashtable
A collection of values stored based on ICloneable, ICollection, a hash code of the value, called a key. IEnumerable, IDictionary, and others A FIFO queue; a first in, first out collection of objects. A sorted collection of keys and values accessible by both key and index. A collection of string objects. A LIFO queue; a last in, first out collection of objects.
ICloneable, ICollection, IEnumerable ICloneable, ICollection, IEnumerable, IDictionary IList, ICollection, IEnumerable ICloneable, ICollection, IEnumerable
Queue
SortedList
StringCollection
Stack
Since we do not have a database here, the DataView class is not appropriate. If all we wanted was a collection of file names, the StringCollection class would work, but then our PhotoAlbum would not be very extensible. This leaves us with a simple array or the ArrayList or CollectionBase classes. A simple fixed-size array is not appropriate since we would like our album to grow dynamically. So we are left to choose between the ArrayList and CollectionBase classes. Either class would work here, and both classes can be quite useful. An overview of the ArrayList class is shown in .NET Table 5.1. Deriving our PhotoAlbum class from ArrayList would look like this:
// Deriving PhotoAlbum from ArrayList (not our approach) public class PhotoAlbum : System.Collections.ArrayList { // Inherits all properties and methods from ArrayList }
An advantage of this approach is that we would not need to implement many of the methods, since they would be directly inherited from ArrayList. A disadvantage is that all methods would accept any object, and not just our Photograph objects. If you look at the documentation, you will see that the methods in ArrayList operate on object instances. For example, the PhotoAlbum.Add method would have the following signature:
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// PhotoAlbum.Add when derived from ArrayList public int Add( object value );
So while this would be a very easy implementation, the methods in our PhotoAlbum class would not be type-safe, and therefore not so robust.
.NET Table 5.1 ArrayList class
The ArrayList class is a collection of indexed objects where the number of objects can change dynamically. This class is part of the System.Collections namespace, and is very similar to the Array class for fixed-length collections of objects. The ArrayList class supports the ICloneable, IEnumerable, ICollection, and IList interfaces. Public Properties Capacity Count Add AddRange Clear Contains CopyTo Public Methods IndexOf Gets or sets the maximum number of objects the list can contain. Gets or sets the actual number of objects in the array. Adds an object to the end of the array. Adds the elements from an ICollection interface to the end of the array. Removes all objects from the array. Determines if an object is in the array. Comparison is done using the Object.Equals method. Copies the ArrayList, or a portion of it, into a one-dimensional Array object. Returns the zero-based index of the first occurrence of the given object in the array, or 1 if the object is not found. Comparison is done using the Object.Equals method. Removes an object from the array. Removes the object at a given index from the array. Sorts the array, using an IComparable interface to compare objects. Sets the capacity of the array to the actual number of objects in it.
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