IEnumerable Interface
.NET Framework 3.0
Exposes the enumerator, which supports a simple iteration over a non-generic collection.
Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)
Assembly: mscorlib (in mscorlib.dll)
'Declaration <ComVisibleAttribute(True)> _ <GuidAttribute("496B0ABE-CDEE-11d3-88E8-00902754C43A")> _ Public Interface IEnumerable 'Usage Dim instance As IEnumerable
/** @attribute ComVisibleAttribute(true) */
/** @attribute GuidAttribute("496B0ABE-CDEE-11d3-88E8-00902754C43A") */
public interface IEnumerable
ComVisibleAttribute(true) GuidAttribute("496B0ABE-CDEE-11d3-88E8-00902754C43A") public interface IEnumerable
Not applicable.
For the generic version of this interface see System.Collections.Generic.IEnumerable.
Notes to Implementers: IEnumerable must be implemented to support the foreach semantics of Microsoft Visual Basic. COM classes that allow enumerators also implement this interface.The following code example demonstrates the implementation of the IEnumerable and IEnumerator interfaces for a custom collection. In this example, members of these interfaces are not explicitly called, but they are implemented to support the use of foreach (For Each in Visual Basic) to iterate through the collection.
Imports System Imports System.Collections Public Class Person Public Sub New(ByVal fName As String, ByVal lName As String) Me.firstName = fName Me.lastName = lName End Sub Public firstName As String Public lastName As String End Class Public Class People Implements IEnumerable Private _people() As Person Public Sub New(ByVal pArray() As Person) _people = New Person(pArray.Length - 1) {} Dim i As Integer For i = 0 To pArray.Length - 1 _people(i) = pArray(i) Next i End Sub Public Function GetEnumerator() As IEnumerator _ Implements IEnumerable.GetEnumerator Return New PeopleEnum(_people) End Function End Class Public Class PeopleEnum Implements IEnumerator Public _people() As Person ' Enumerators are positioned before the first element ' until the first MoveNext() call. Dim position As Integer = -1 Public Sub New(ByVal list() As Person) _people = list End Sub Public Function MoveNext() As Boolean Implements IEnumerator.MoveNext position = position + 1 Return (position < _people.Length) End Function Public Sub Reset() Implements IEnumerator.Reset position = -1 End Sub Public ReadOnly Property Current() As Object Implements IEnumerator.Current Get Try Return _people(position) Catch ex As IndexOutOfRangeException Throw New InvalidOperationException() End Try End Get End Property End Class Class App Shared Sub Main() Dim peopleArray() As Person = { _ New Person("John", "Smith"), _ New Person("Jim", "Johnson"), _ New Person("Sue", "Rabon")} Dim peopleList As New People(peopleArray) Dim p As Person For Each p In peopleList Console.WriteLine(p.firstName + " " + p.lastName) Next End Sub End Class ' This code produces output similar to the following: ' ' John Smith ' Jim Johnson ' Sue Rabon
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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