Dictionary.System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Remove メソッド

.NET Framework クラス ライブラリ リファレンス

Dictionary.System.Collections.Generic.ICollection>.Remove メソッド

メモ : このメソッドは、.NET Framework version 2.0 で新しく追加されたものです。

ディクショナリからキーと値を削除します。

名前空間: System.Collections.Generic
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Private Function System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Remove
 ( _
    keyValuePair As KeyValuePair(Of TKey, TValue)
 _
) As Boolean Implements
 ICollection(Of KeyValuePair(Of TKey, TValue)).Remove

Visual Basic (使用法)

Dim instance As Dictionary(Of
 TKey, TValue)
Dim keyValuePair As KeyValuePair(Of
 TKey, TValue)
Dim returnValue As Boolean

returnValue = CType(instance, ICollection(Of KeyValuePair(Of
 TKey, TValue))).Remove(keyValuePair)

C#

bool ICollection<KeyValuePair<TKey,TValue>>.Remove
 (
    KeyValuePair<TKey,TValue> keyValuePair
)

C++

private:
virtual bool System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Remove
 (
    KeyValuePair<TKey, TValue> keyValuePair
) sealed = ICollection<KeyValuePair<TKey, TValue>>::Remove

J#

J# では、明示的なインタフェースの実装は使用できますが、新規に宣言することはできません。

JScript

JScript では、明示的なインタフェースの実装は使用できますが、新規に宣言することはできません。

パラメータ

keyValuePair

Dictionary から削除するキーと値を表す KeyValuePair 構造体。

戻り値
keyValuePair で表されたキーと値が見つかり、正常に削除された場合は true。それ以外の場合は false。このメソッドは、keyValuePair が ICollection に見つからない場合、false を返します。

解説

このメソッドは、Comparer を使用してキーが等しいかどうかを確認し、既定の等値比較演算子 EqualityComparer.Default を使用して値が等しいかどうかを確認します。

このメソッドは O(1) 操作に近くなります。

使用例

System.Collections.Generic.ICollection ジェネリック インターフェイスの System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Add、System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Contains、System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.CopyTo、および System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Remove の各メソッドを使用して、Dictionary オブジェクトを操作する方法を次のコード例に示します。

Visual Basic

Imports System
Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main()
 

        ' Create a new dictionary of strings, with string keys, and
        ' access it through the generic ICollection interface. The
        ' generic ICollection interface views the dictionary as a
        ' collection of KeyValuePair objects with the same type
        ' arguments as the dictionary.
        '
        Dim openWith As ICollection(Of
 KeyValuePair(Of String, String))
 _
            = New Dictionary(Of String,
 String)
        
        ' Add some elements to the dictionary. When elements are 
        ' added through the ICollection(Of T) interface, the keys
        ' and values must be wrapped in KeyValuePair objects.
        '
        openWith.Add(New KeyValuePair(Of String,String)("txt",
 "notepad.exe"))
        openWith.Add(New KeyValuePair(Of String,String)("bmp",
 "paint.exe"))
        openWith.Add(New KeyValuePair(Of String,String)("dib",
 "paint.exe"))
        openWith.Add(New KeyValuePair(Of String,String)("rtf",
 "wordpad.exe"))
        
        Console.WriteLine()
        For Each element As
 KeyValuePair(Of String, String)
 in openWith
            Console.WriteLine("{0}, {1}", element.Key,
 element.Value)
        Next
           
        ' The Contains method also takes a KeyValuePair object.
        '
        Console.WriteLine(vbLf & _
            "Contains(KeyValuePair(""txt"",
 ""notepad.exe"")):
 {0}", _
            openWith.Contains(New KeyValuePair(Of
 String,String)("txt", "notepad.exe")))

        ' The Remove method takes a KeyValuePair object.)
        '
        ' Use the Remove method to remove a key/value pair.
        Console.WriteLine(vbLf &  _
            "Remove(New KeyValuePair(""dib"",
 ""paint.exe""))")
        openWith.Remove(New KeyValuePair(Of
 String,String)("dib", "paint.exe"))
        
        Console.WriteLine()
        For Each element As
 KeyValuePair(Of String, String)
 in openWith
            Console.WriteLine("{0}, {1}", element.Key,
 element.Value)
        Next

        ' Create an array of KeyValuePair objects and copy the 
        ' contents of the dictionary to it. Subtract one from the
        ' array size because Visual Basic allocates an extra array
        ' element.
        Dim copy(openWith.Count - 1) As KeyValuePair(Of
 String, String)
        openWith.CopyTo(copy, 0)
    
        ' List the contents of the array.
        '
        Console.WriteLine()
        For Each element As
 KeyValuePair(Of String, String)
 in copy
            Console.WriteLine("{0}, {1}", element.Key,
 element.Value)
        Next

    End Sub

End Class

' This code example produces the following output:
'
'txt, notepad.exe
'bmp, paint.exe
'dib, paint.exe
'rtf, wordpad.exe
'
'Contains(KeyValuePair("txt", "notepad.exe")): True
'
'Remove(New KeyValuePair("dib", "paint.exe"))
'
'txt, notepad.exe
'bmp, paint.exe
'rtf, wordpad.exe
'
'txt, notepad.exe
'bmp, paint.exe
'rtf, wordpad.exe 

C#

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new dictionary of strings, with string keys, and
        // access it through the generic ICollection interface. The
        // generic ICollection interface views the dictionary as a
        // collection of KeyValuePair objects with the same type
        // arguments as the dictionary.
        //
        ICollection<KeyValuePair<String, String>> openWith =
            new Dictionary<String, String>();
        
        // Add some elements to the dictionary. When elements are 
        // added through the ICollection<T> interface, the keys
        // and values must be wrapped in KeyValuePair objects.
        //
        openWith.Add(new KeyValuePair<String,String>("txt",
 "notepad.exe"));
        openWith.Add(new KeyValuePair<String,String>("bmp",
 "paint.exe"));
        openWith.Add(new KeyValuePair<String,String>("dib",
 "paint.exe"));
        openWith.Add(new KeyValuePair<String,String>("rtf",
 "wordpad.exe"));
        
        Console.WriteLine();
        foreach( KeyValuePair<string, string>
 element in openWith )
        {
            Console.WriteLine("{0}, {1}", element.Key, element.Value);
        }
           
        // The Contains method also takes a KeyValuePair object.
        //
        Console.WriteLine(
            "\nContains(KeyValuePair(\"txt\", \"notepad.exe\")):
 {0}", 
            openWith.Contains(new KeyValuePair<String,String>("txt",
 "notepad.exe")));

        // The Remove method takes a KeyValuePair object.)
        //
        // Use the Remove method to remove a key/value pair.
        Console.WriteLine("\nRemove(new KeyValuePair(\"dib\",
 \"paint.exe\"))");
        openWith.Remove(new KeyValuePair<String,String>("dib",
 "paint.exe"));
        
        Console.WriteLine();
        foreach( KeyValuePair<string, string>
 element in openWith )
        {
            Console.WriteLine("{0}, {1}", element.Key, element.Value);
        }

        // Create an array of KeyValuePair objects and copy the 
        // contents of the dictionary to it. 
        // 
        KeyValuePair<string, string>[]
 copy = 
            new KeyValuePair<string, string>[openWith.Count];
        openWith.CopyTo(copy, 0);
    
        // List the contents of the array.
        //
        Console.WriteLine();
        foreach( KeyValuePair<string, string>
 element in copy )
        {
            Console.WriteLine("{0}, {1}", element.Key, element.Value);
        }
    }
}

/* This code example produces the following output:

txt, notepad.exe
bmp, paint.exe
dib, paint.exe
rtf, wordpad.exe

Contains(KeyValuePair("txt", "notepad.exe")): True

Remove(new KeyValuePair("dib", "paint.exe"))

txt, notepad.exe
bmp, paint.exe
rtf, wordpad.exe

txt, notepad.exe
bmp, paint.exe
rtf, wordpad.exe
 */

プラットフォーム

Windows 98, Windows 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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0
.NET Compact Framework
サポート対象 : 2.0

参照

関連項目
Dictionary ジェネリック クラス
Dictionary メンバ
System.Collections.Generic 名前空間