IEnumerable IEnumerable IEnumerable IEnumerable Interface

정의

제네릭이 아닌 컬렉션에서 단순하게 반복할 수 있도록 지원하는 열거자를 노출합니다. Exposes an enumerator, which supports a simple iteration over a non-generic collection.

public interface class IEnumerable
[System.Runtime.InteropServices.ComVisible(true)]
[System.Runtime.InteropServices.Guid("496B0ABE-CDEE-11d3-88E8-00902754C43A")]
public interface IEnumerable
type IEnumerable = interface
Public Interface IEnumerable
파생
특성

예제

다음 코드 예제를 구현 하 여 사용자 지정 컬렉션을 반복 하는 것에 대 한 모범 사례를 보여 줍니다.는 IEnumerableIEnumerator 인터페이스입니다.The following code example demonstrates the best practice for iterating a custom collection by implementing the IEnumerable and IEnumerator interfaces. 이 예제에서는 이러한 인터페이스의 멤버는 명시적으로 호출 되지 않습니다, 하지만의 사용을 지원 하도록 구현 됩니다 foreach (For Each Visual basic에서)의 컬렉션을 반복 합니다.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. 이 예제는 완전 한 콘솔 앱.This example is a complete Console app. Visual Basic 앱을 컴파일하려면 변경 합니다 시작 개체Sub Main 프로젝트의 속성 페이지입니다.To compile the Visual Basic app, change the Startup object to Sub Main in the project’s Properties page.

구현 하는 방법을 보여 주는 샘플에 대 한 합니다 IEnumerable 인터페이스를 참조 하십시오 컬렉션 클래스에 IEnumerable 인터페이스를 구현 합니다.For a sample that shows how to implement the IEnumerable interface, see Implementing the IEnumerable Interface in a Collection Class

using System;
using System.Collections;

// Simple business object.
public class Person
{
    public Person(string fName, string lName)
    {
        this.firstName = fName;
        this.lastName = lName;
    }

    public string firstName;
    public string lastName;
}

// Collection of Person objects. This class
// implements IEnumerable so that it can be used
// with ForEach syntax.
public class People : IEnumerable
{
    private Person[] _people;
    public People(Person[] pArray)
    {
        _people = new Person[pArray.Length];

        for (int i = 0; i < pArray.Length; i++)
        {
            _people[i] = pArray[i];
        }
    }

// Implementation for the GetEnumerator method.
    IEnumerator IEnumerable.GetEnumerator()
    {
       return (IEnumerator) GetEnumerator();
    }

    public PeopleEnum GetEnumerator()
    {
        return new PeopleEnum(_people);
    }
}

// When you implement IEnumerable, you must also implement IEnumerator.
public class PeopleEnum : IEnumerator
{
    public Person[] _people;

    // Enumerators are positioned before the first element
    // until the first MoveNext() call.
    int position = -1;

    public PeopleEnum(Person[] list)
    {
        _people = list;
    }

    public bool MoveNext()
    {
        position++;
        return (position < _people.Length);
    }

    public void Reset()
    {
        position = -1;
    }

    object IEnumerator.Current
    {
        get
        {
            return Current;
        }
    }

    public Person Current
    {
        get
        {
            try
            {
                return _people[position];
            }
            catch (IndexOutOfRangeException)
            {
                throw new InvalidOperationException();
            }
        }
    }
}

class App
{
    static void Main()
    {
        Person[] peopleArray = new Person[3]
        {
            new Person("John", "Smith"),
            new Person("Jim", "Johnson"),
            new Person("Sue", "Rabon"),
        };

        People peopleList = new People(peopleArray);
        foreach (Person p in peopleList)
            Console.WriteLine(p.firstName + " " + p.lastName);

    }
}

/* This code produces output similar to the following:
 *
 * John Smith
 * Jim Johnson
 * Sue Rabon
 *
 */
Imports System
Imports System.Collections

' Simple business object.
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

' Collection of Person objects, which implements IEnumerable so that
' it can be used with ForEach syntax.
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

    ' Implementation of GetEnumerator.
    Public Function GetEnumerator() As IEnumerator _
      Implements IEnumerable.GetEnumerator

        Return New PeopleEnum(_people)
    End Function

End Class

' When you implement IEnumerable, you must also implement IEnumerator.
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

설명

IEnumerable 열거할 수 있는 모든 제네릭이 아닌 컬렉션에 대 한 기본 인터페이스가입니다.IEnumerable is the base interface for all non-generic collections that can be enumerated. 이 인터페이스의 제네릭 버전에 대 한 참조 System.Collections.Generic.IEnumerable<T>합니다.For the generic version of this interface see System.Collections.Generic.IEnumerable<T>. IEnumerable 단일 메서드를 포함 GetEnumerator를 반환 하는 IEnumerator합니다.IEnumerable contains a single method, GetEnumerator, which returns an IEnumerator. IEnumerator 노출 하 여 컬렉션을 반복 하는 기능을 제공 된 Current 속성 및 MoveNextReset 메서드.IEnumerator provides the ability to iterate through the collection by exposing a Current property and MoveNext and Reset methods.

그러나 구현 하는 것이 좋습니다 IEnumerableIEnumerator 사용 하도록 설정 하 고 컬렉션 클래스에는 foreach (For Each Visual basic에서) 구현 구문 IEnumerable 필요 하지 않습니다.It is a best practice to implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual Basic) syntax, however implementing IEnumerable is not required. 컬렉션을 구현 하지 않는 경우 IEnumerable를 제공 하 여이 구문을 지원 하도록 반복기 패턴을 따라야 여전히를 GetEnumerator 인터페이스, 클래스 또는 구조체를 반환 하는 메서드.If your collection does not implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a GetEnumerator method that returns an interface, class or struct. Visual Basic을 사용 하는 경우 제공 해야 합니다는 IEnumerator 구현에서 반환 하는 GetEnumerator합니다.When using Visual Basic, you must provide an IEnumerator implementation, which is returned by GetEnumerator. C#를 사용 하 여 개발를 포함 하는 클래스를 제공 해야 합니다는 경우는 Current 속성 및 MoveNextReset 에 설명 된 대로 메서드 IEnumerator, 클래스를 구현 하지 않아도 되지만 IEnumerator합니다.When developing with C# you must provide a class that contains a Current property, and MoveNext and Reset methods as described by IEnumerator, but the class does not have to implement IEnumerator.

메서드

GetEnumerator() GetEnumerator() GetEnumerator() GetEnumerator()

컬렉션을 반복하는 열거자를 반환합니다. Returns an enumerator that iterates through a collection.

적용 대상

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