IList Antarmuka

Referensi

Definisi

Ruang nama:: System.Collections

Rakitan:: System.Runtime.dll

Rakitan:: mscorlib.dll

Rakitan:: netstandard.dll

Penting

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Mewakili kumpulan objek yang tidak umum yang dapat diakses secara individual oleh indeks.

public interface class IList : System::Collections::ICollection

public interface IList : System.Collections.ICollection

[System.Runtime.InteropServices.ComVisible(true)]
public interface IList : System.Collections.ICollection

type IList = interface
    interface ICollection
    interface IEnumerable

[<System.Runtime.InteropServices.ComVisible(true)>]
type IList = interface
    interface ICollection
    interface IEnumerable

Public Interface IList
Implements ICollection

Turunan: Microsoft.VisualBasic.Collection

System.Activities.Presentation.Model.ModelItemCollection

System.Activities.Presentation.Toolbox.ToolboxCategory

System.Activities.Presentation.Toolbox.ToolboxCategoryItems

System.Array

Lainnya…

Atribut: ComVisibleAttribute

Penerapan: ICollection IEnumerable

Contoh

Contoh berikut menunjukkan implementasi antarmuka IList untuk membuat daftar ukuran tetap yang sederhana.

using System;
using System.Collections;

class Program
{
    static void Main()
    {
        var test = new SimpleList();

        // Populate the List.
        Console.WriteLine("Populate the List");
        test.Add("one");
        test.Add("two");
        test.Add("three");
        test.Add("four");
        test.Add("five");
        test.Add("six");
        test.Add("seven");
        test.Add("eight");
        test.PrintContents();
        Console.WriteLine();

        // Remove elements from the list.
        Console.WriteLine("Remove elements from the list");
        test.Remove("six");
        test.Remove("eight");
        test.PrintContents();
        Console.WriteLine();

        // Add an element to the end of the list.
        Console.WriteLine("Add an element to the end of the list");
        test.Add("nine");
        test.PrintContents();
        Console.WriteLine();

        // Insert an element into the middle of the list.
        Console.WriteLine("Insert an element into the middle of the list");
        test.Insert(4, "number");
        test.PrintContents();
        Console.WriteLine();

        // Check for specific elements in the list.
        Console.WriteLine("Check for specific elements in the list");
        Console.WriteLine($"List contains \"three\": {test.Contains("three")}");
        Console.WriteLine($"List contains \"ten\": {test.Contains("ten")}");
    }
}

class SimpleList : IList
{
    private object[] _contents = new object[8];
    private int _count;

    public SimpleList()
    {
        _count = 0;
    }

    // IList Members
    public int Add(object value)
    {
        if (_count < _contents.Length)
        {
            _contents[_count] = value;
            _count++;

            return (_count - 1);
        }

        return -1;
    }

    public void Clear()
    {
        _count = 0;
    }

    public bool Contains(object value)
    {
        for (int i = 0; i < Count; i++)
        {
            if (_contents[i] == value)
            {
                return true;
            }
        }
        return false;
    }

    public int IndexOf(object value)
    {
        for (int i = 0; i < Count; i++)
        {
            if (_contents[i] == value)
            {
                return i;
            }
        }
        return -1;
    }

    public void Insert(int index, object value)
    {
        if ((_count + 1 <= _contents.Length) && (index < Count) && (index >= 0))
        {
            _count++;

            for (int i = Count - 1; i > index; i--)
            {
                _contents[i] = _contents[i - 1];
            }
            _contents[index] = value;
        }
    }

    public bool IsFixedSize
    {
        get
        {
            return true;
        }
    }

    public bool IsReadOnly
    {
        get
        {
            return false;
        }
    }

    public void Remove(object value)
    {
        RemoveAt(IndexOf(value));
    }

    public void RemoveAt(int index)
    {
        if ((index >= 0) && (index < Count))
        {
            for (int i = index; i < Count - 1; i++)
            {
                _contents[i] = _contents[i + 1];
            }
            _count--;
        }
    }

    public object this[int index]
    {
        get
        {
            return _contents[index];
        }
        set
        {
            _contents[index] = value;
        }
    }

    // ICollection members.

    public void CopyTo(Array array, int index)
    {
        for (int i = 0; i < Count; i++)
        {
            array.SetValue(_contents[i], index++);
        }
    }

    public int Count
    {
        get
        {
            return _count;
        }
    }

    public bool IsSynchronized
    {
        get
        {
            return false;
        }
    }

    // Return the current instance since the underlying store is not
    // publicly available.
    public object SyncRoot
    {
        get
        {
            return this;
        }
    }

    // IEnumerable Members

    public IEnumerator GetEnumerator()
    {
        // Refer to the IEnumerator documentation for an example of
        // implementing an enumerator.
        throw new NotImplementedException("The method or operation is not implemented.");
    }

    public void PrintContents()
    {
        Console.WriteLine($"List has a capacity of {_contents.Length} and currently has {_count} elements.");
        Console.Write("List contents:");
        for (int i = 0; i < Count; i++)
        {
            Console.Write($" {_contents[i]}");
        }
        Console.WriteLine();
    }
}

// This code produces output similar to the following:
// Populate the List:
// List has a capacity of 8 and currently has 8 elements.
// List contents: one two three four five six seven eight
//
// Remove elements from the list:
// List has a capacity of 8 and currently has 6 elements.
// List contents: one two three four five seven
//
// Add an element to the end of the list:
// List has a capacity of 8 and currently has 7 elements.
// List contents: one two three four five seven nine
//
// Insert an element into the middle of the list:
// List has a capacity of 8 and currently has 8 elements.
// List contents: one two three four number five seven nine
//
// Check for specific elements in the list:
// List contains "three": True
// List contains "ten": False

Imports System.Collections

Public Class Program
    Shared Sub Main()

        Dim myList As New SimpleList()

        ' Populate the List.
        Console.WriteLine("Populate the List")
        myList.Add("one")
        myList.Add("two")
        myList.Add("three")
        myList.Add("four")
        myList.Add("five")
        myList.Add("six")
        myList.Add("seven")
        myList.Add("eight")
        myList.PrintContents()
        Console.WriteLine()

        ' Remove elements from the list.
        Console.WriteLine("Remove elements from the list")
        myList.Remove("six")
        myList.Remove("eight")
        myList.PrintContents()
        Console.WriteLine()

        ' Add an element to the end of the list.
        Console.WriteLine("Add an element to the end of the list")
        myList.Add("nine")
        myList.PrintContents()
        Console.WriteLine()

        ' Insert an element into the middle of the list.
        Console.WriteLine("Insert an element into the middle of the list")
        myList.Insert(4, "number")
        myList.PrintContents()
        Console.WriteLine()

        ' Check for specific elements in the list.
        Console.WriteLine("Check for specific elements in the list")
        Console.WriteLine($"List contains 'three': {myList.Contains("three")}")
        Console.WriteLine($"List contains 'ten': {myList.Contains("ten")}")
    End Sub
End Class

Public Class SimpleList
    Implements IList

    Private _contents(7) As Object
    Private _count As Integer

    Public Sub New()

        _count = 0
    End Sub

    ' IList members.
    Public Function Add(ByVal value As Object) As Integer Implements IList.Add
        If _count < _contents.Length Then
            _contents(_count) = value
            _count += 1

            Return _count - 1
        End If

        Return -1
    End Function

    Public Sub Clear() Implements IList.Clear
        _count = 0
    End Sub

    Public Function Contains(ByVal value As Object) As Boolean Implements IList.Contains
        For i As Integer = 0 To Count - 1
            If _contents(i) = value Then Return True
        Next

        Return False
    End Function

    Public Function IndexOf(ByVal value As Object) As Integer Implements IList.IndexOf
        For i As Integer = 0 To Count - 1
            If _contents(i) = value Then Return i
        Next
        Return -1
    End Function

    Public Sub Insert(ByVal index As Integer, ByVal value As Object) Implements IList.Insert

        If _count + 1 <= _contents.Length AndAlso index < Count AndAlso index >= 0 Then
            _count += 1

            For i As Integer = Count - 1 To index Step -1
                _contents(i) = _contents(i - 1)
            Next
            _contents(index) = value
        End If
    End Sub

    Public ReadOnly Property IsFixedSize() As Boolean Implements IList.IsFixedSize
        Get
            Return True
        End Get
    End Property

    Public ReadOnly Property IsReadOnly() As Boolean Implements IList.IsReadOnly
        Get
            Return False
        End Get
    End Property

    Public Sub Remove(ByVal value As Object) Implements IList.Remove
        RemoveAt(IndexOf(value))
    End Sub

    Public Sub RemoveAt(ByVal index As Integer) Implements IList.RemoveAt

        if index >= 0 AndAlso index < Count Then
            for i As Integer = index To Count - 2
                _contents(i) = _contents(i + 1)
            Next
            _count -= 1
        End If
    End Sub

    Public Property Item(ByVal index As Integer) As Object Implements IList.Item
        Get
            Return _contents(index)
        End Get

        Set(ByVal value As Object)
            _contents(index) = value
        End Set
    End Property

    ' ICollection members.
    Public Sub CopyTo(ByVal array As Array, ByVal index As Integer) Implements ICollection.CopyTo
        For i As Integer = 0 To Count - 1
            array.SetValue(_contents(i), index)
            index += 1
        Next
    End Sub

    Public ReadOnly Property Count() As Integer Implements ICollection.Count
        Get
            Return _count
        End Get
    End Property

    Public ReadOnly Property IsSynchronized() As Boolean Implements ICollection.IsSynchronized
        Get
            Return False
        End Get
    End Property

    ' Return the current instance since the underlying store is not
    ' publicly available.
    Public ReadOnly Property SyncRoot() As Object Implements ICollection.SyncRoot
        Get
            Return Me
        End Get
    End Property

    ' IEnumerable members.
    Public Function GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator

        ' Refer to the IEnumerator documentation for an example of
        ' implementing an enumerator.
        Throw New NotImplementedException("The method or operation is not implemented.")
    End Function

    Public Sub PrintContents()
        Console.WriteLine($"List has a capacity of {_contents.Length} and currently has {_count} elements.")
        Console.Write("List contents:")

        For i As Integer = 0 To Count - 1
            Console.Write($" {_contents(i)}")
        Next

        Console.WriteLine()
    End Sub
End Class

' This code produces output similar to the following:
' Populate the List:
' List has a capacity of 8 and currently has 8 elements.
' List contents: one two three four five six seven eight
'
' Remove elements from the list:
' List has a capacity of 8 and currently has 6 elements.
' List contents: one two three four five seven
'
' Add an element to the end of the list:
' List has a capacity of 8 and currently has 7 elements.
' List contents: one two three four five seven nine
'
' Insert an element into the middle of the list:
' List has a capacity of 8 and currently has 8 elements.
' List contents: one two three four number five seven nine
'
' Check for specific elements in the list:
' List contains "three": True
' List contains "ten": False

Keterangan

IList adalah keturunan antarmuka ICollection dan merupakan antarmuka dasar dari semua daftar non-generik. IList implementasi termasuk dalam tiga kategori: baca-saja, ukuran tetap, dan ukuran variabel. IList baca-saja tidak dapat dimodifikasi. IList ukuran tetap tidak memungkinkan penambahan atau penghapusan elemen, tetapi memungkinkan modifikasi elemen yang ada. IList ukuran variabel memungkinkan penambahan, penghapusan, dan modifikasi elemen.

Untuk versi generik antarmuka ini, lihat System.Collections.Generic.IList<T>.

Properti

Count	Mendapatkan jumlah elemen yang terkandung dalam ICollection. (Diperoleh dari ICollection)
IsFixedSize	Mendapatkan nilai yang menunjukkan apakah IList memiliki ukuran tetap.
IsReadOnly	Mendapatkan nilai yang menunjukkan apakah IList bersifat baca-saja.
IsSynchronized	Mendapatkan nilai yang menunjukkan apakah akses ke ICollection disinkronkan (utas aman). (Diperoleh dari ICollection)
Item[Int32]	Mendapatkan atau mengatur elemen pada indeks yang ditentukan.
SyncRoot	Mendapatkan objek yang dapat digunakan untuk menyinkronkan akses ke ICollection. (Diperoleh dari ICollection)

Metode

Add(Object)	Menambahkan item ke IList.
Clear()	Menghapus semua item dari IList.
Contains(Object)	Menentukan apakah IList berisi nilai tertentu.
CopyTo(Array, Int32)	Menyalin elemen ICollection ke Array, dimulai pada indeks Array tertentu. (Diperoleh dari ICollection)
GetEnumerator()	Mengembalikan enumerator yang melakukan iterasi melalui koleksi. (Diperoleh dari IEnumerable)
IndexOf(Object)	Menentukan indeks item tertentu dalam IList.
Insert(Int32, Object)	Menyisipkan item ke IList pada indeks yang ditentukan.
Remove(Object)	Menghapus kemunculan pertama objek tertentu dari IList.
RemoveAt(Int32)	Menghapus item IList pada indeks yang ditentukan.

Metode Ekstensi

Cast<TResult>(IEnumerable)	Melemparkan elemen IEnumerable ke jenis yang ditentukan.
OfType<TResult>(IEnumerable)	Memfilter elemen IEnumerable berdasarkan jenis tertentu.
AsParallel(IEnumerable)	Mengaktifkan paralelisasi kueri.
AsQueryable(IEnumerable)	Mengonversi IEnumerable menjadi IQueryable.

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