Members of the IList Interface in VS .NET

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Table 8-1 Members of the IList Interface
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Syntax Count CopyTo(array, index) Item(index) Clear Add(object)
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Description Returns the number of elements in the collection (inherited from ICollection). Copies elements from the collection to an array, starting at the specified index in the array (inherited from ICollection). Gets or sets the element at the specified 0-based index. This is the default member. Removes all items from the collection. Appends an element after the last element in the collection and returns the index to where it was inserted.
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8:
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Arrays, Lists, and Collections
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Table 8-1
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Members of the IList Interface
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Description Inserts an element at a given index.
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Removes an object from the collection.
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Removes an element at the specified index.
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Returns True if an object is in the collection.
Returns the index of the object in the collection, or -1 if not found.
Returns True if no item can be added to the collection.
Returns True if items can t be written to.
Syntax Insert(index, object) Remove(object) RemoveAt(index) Contains(object) IndexOf(object) IsFixedSize IsReadOnly
The IDictionary interface defines a collectionlike object that contains one or more (key, value) pairs for which the key can be any object (not just a string, as in Visual Basic 6 collections). The IDictionary interface inherits from ICollection and extends it using the methods defined in Table 8-2. As for the IList interface, implementations of the IDic tionary interface can be read-only, fixed-size, or variable-size.
Table 8-2
Members of the IDictionary Interface
Description Returns the number of elements in the dictionary (inherited from ICollection). Copies elements from the dictionary to an array, starting at the specified index in the array (inherited from ICollection). Gets or sets the element associated with the specified key. This is the default member. Removes all items from the dictionary. Inserts a (key, value) pair into the dictionary; key must not be Nothing. Removes the dictionary element associated with a given key. Returns True if an element with the specified key is in the dictio nary. Returns an ICollection object that contains all the keys in the dic tionary. Returns an ICollection object that contains all the values in the dic tionary. Returns True if no item can be added to the dictionary. Returns True if items can t be written to.
Syntax Count CopyTo(array, index) Item(key) Clear Add(key, value) Remove(key) Contains(key) Keys Values IsFixedSize IsReadOnly
Part III:
Programming the .NET Framework
A class that implements the ICollection, IList, or IDictionary interface isn t required to expose all the interface s properties and methods as Public members. For example, the Array class implements IList, but the Add, Insert, and Remove members don t appear in the Array class interface because the array has a fixed size. You get an exception if you try to access these methods by casting an array to an IList variable. A trait that all the classes in System.Collections except the BitArray class have in com mon is that they can store Object values. This means that you can store any type of value inside them and even mix data types inside the same structure. In this sense, they re similar to the Collection object in Visual Basic 6, which used Variants internally and could therefore store numbers, strings, dates, and objects.
The BitArray Class
The BitArray object can hold a large number of Boolean values in a compact format, using a single bit for each element. This class implements IEnumerable (and thus supports For Each), ICollection (and thus supports indexing of individual elements), and ICloneable (and thus supports the Clone method). You can create a BitArray object in many ways:
Provide the number of elements (all initialized to False).
Dim ba As New BitArray(1024)
Provide the number of elements, and initialize them to a value.
Dim ba2 As New BitArray(1024, True)
Initialize the BitArray from an array of Boolean, Byte, or Integer.
Dim boolArr(1023) As Boolean
...(Initialize the boolArr array)...
Dim ba3 As New BitArray(boolArr)
Initialize the BitArray from another BitArray object.
Dim ba4 As New BitArray(ba)
You can retrieve the number of elements in a BitArray by using either the Count prop erty or the Length property. The Get method reads and the Set method modifies the element at the specified index:
Set element at index 9, and read it back. ba.Set(9, True) Console.WriteLine(ba.Get(9)) => True
The CopyTo method can move all elements back to an array of Booleans, or it can perform a bitwise copy of the BitArray to a 0-based Byte or Integer array:
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