KeyedCollection.GetKeyForItem メソッドとは？ わかりやすく解説

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KeyedCollection.GetKeyForItem 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。

派生クラスで実装された場合、指定した要素からキーを抽出します。

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

Visual Basic (宣言)
Protected MustOverride Function
 GetKeyForItem ( _
    item As TItem _
) As TKey
Visual Basic (使用法)
Dim item As TItem
Dim returnValue As TKey

returnValue = Me.GetKeyForItem(item)
C#
protected abstract TKey GetKeyForItem (
    TItem item
)
C++
protected:
virtual TKey GetKeyForItem (
    TItem item
) abstract
J#
protected abstract TKey GetKeyForItem (
    TItem item
)
JScript
protected abstract function GetKeyForItem (
    item : TItem
) : TKey

パラメータ

item

キーの抽出元要素。

戻り値
指定した要素のキー。

解説解説

検索ディクショナリのキーが item に埋め込まれたキーと異なる場合は、GetKeyForItem で返されるキーを使用して item にアクセスすることはできません。

このメソッドは O(1) 操作です。

実装についてのメモ

このメソッドをオーバーライドして、ディクショナリに、ディクショナリの項目からキーを抽出する手段を提供する必要があります。

このメソッドは内部的に呼び出されます。パブリックにする必要はありません。

使用例使用例

このコード例は、KeyedCollection からコレクション クラスを派生させるために必要な最小限のコードを示しています。GetKeyForItem メソッドをオーバーライドし、基本クラス コンストラクタに処理を代行させるパブリック コンストラクタを用意しています。また、KeyedCollection クラスおよび Collection クラスから継承されたプロパティおよびメソッドも多数示しています。

SimpleOrder クラスは、OrderItem オブジェクトを含んでいる非常に単純な発注リストです。各オブジェクトは行項目を順番に表します。OrderItem のキーは変更できません。これは、KeyedCollection の派生クラスを使用する際に考慮する必要がある重要な事項です。変更可能なキーを使用するコード例の詳細については、ChangeItemKey のトピックを参照してください。

Visual Basic
Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel

' This class represents a very simple keyed list of OrderItems,
' inheriting most of its behavior from the KeyedCollection and 
' Collection classes. The immediate base class is the constructed
' type KeyedCollection(Of Integer, OrderItem). When you inherit
' from KeyedCollection, the second generic type argument is the 
' type that you want to store in the collection -- in this case
' OrderItem. The first generic argument is the type that you want
' to use as a key. Its values must be calculated from OrderItem; 
' in this case it is the Integer field PartNumber, so SimpleOrder
' inherits KeyedCollection(Of Integer, OrderItem).
'
Public Class SimpleOrder
    Inherits KeyedCollection(Of Integer,
 OrderItem)

    ' The parameterless constructor of the base class creates a 
    ' KeyedCollection with an internal dictionary. For this code 
    ' example, no other constructors are exposed.
    '
    Public Sub New()
        MyBase.New()
    End Sub
    
    ' This is the only method that absolutely must be overridden,
    ' because without it the KeyedCollection cannot extract the
    ' keys from the items. The input parameter type is the 
    ' second generic type argument, in this case OrderItem, and 
    ' the return value type is the first generic type argument,
    ' in this case Integer.
    '
    Protected Overrides Function
 GetKeyForItem( _
        ByVal item As OrderItem) As
 Integer

        ' In this example, the key is the part number.
        Return item.PartNumber   
    End Function

End Class

Public Class Demo
    
    Public Shared Sub Main()
 
        Dim weekly As New
 SimpleOrder()

        ' The Add method, inherited from Collection, takes OrderItem.
        '
        weekly.Add(New OrderItem(110072674, "Widget",
 400, 45.17))
        weekly.Add(New OrderItem(110072675, "Sprocket",
 27, 5.3))
        weekly.Add(New OrderItem(101030411, "Motor",
 10, 237.5))
        weekly.Add(New OrderItem(110072684, "Gear",
 175, 5.17))
        
        Display(weekly)
    
        ' The Contains method of KeyedCollection takes TKey.
        '
        Console.WriteLine(vbLf & "Contains(101030411): {0}",
 _
            weekly.Contains(101030411))

        ' The default Item property of KeyedCollection takes the key
        ' type, Integer.
        '
        Console.WriteLine(vbLf & "weekly(101030411).Description:
 {0}", _
            weekly(101030411).Description)

        ' The Remove method of KeyedCollection takes a key.
        '
        Console.WriteLine(vbLf & "Remove(101030411)")
        weekly.Remove(101030411)
        Display(weekly)

        ' The Insert method, inherited from Collection, takes an 
        ' index and an OrderItem.
        '
        Console.WriteLine(vbLf & "Insert(2, New OrderItem(...))")
        weekly.Insert(2, New OrderItem(111033401, "Nut",
 10, .5))
        Display(weekly)

        ' The default Item property is overloaded. One overload comes
        ' from KeyedCollection(Of Integer, OrderItem); that overload
        ' is read-only, and takes Integer because it retrieves by key.
 
        ' The other overload comes from Collection(Of OrderItem), the
 
        ' base class of KeyedCollection(Of Integer, OrderItem); it 
        ' retrieves by index, so it also takes an Integer. The compiler
        ' uses the most-derived overload, from KeyedCollection, so the
        ' only way to access SimpleOrder by index is to cast it to
        ' Collection(Of OrderItem). Otherwise the index is interpreted
        ' as a key, and KeyNotFoundException is thrown.
        '
        Dim coweekly As Collection(Of
 OrderItem) = weekly
        Console.WriteLine(vbLf & "coweekly(2).Description:
 {0}", _
            coweekly(2).Description)
 
        Console.WriteLine(vbLf & "coweekly(2) = New OrderItem(...)")
        coweekly(2) = New OrderItem(127700026, "Crank",
 27, 5.98)

        Dim temp As OrderItem = coweekly(2)

        ' The IndexOf method, inherited from Collection(Of OrderItem),
 
        ' takes an OrderItem instead of a key.
        ' 
        Console.WriteLine(vbLf & "IndexOf(temp): {0}",
 _
            weekly.IndexOf(temp))

        ' The inherited Remove method also takes an OrderItem.
        '
        Console.WriteLine(vbLf & "Remove(temp)")
        weekly.Remove(temp)
        Display(weekly)

        Console.WriteLine(vbLf & "RemoveAt(0)")
        weekly.RemoveAt(0)
        Display(weekly)

    End Sub
    
    Private Shared Sub Display(ByVal
 order As SimpleOrder) 
        Console.WriteLine()
        For Each item As
 OrderItem In  order
            Console.WriteLine(item)
        Next item
    End Sub
End Class

' This class represents a simple line item in an order. All the 
' values are immutable except quantity.
' 
Public Class OrderItem
    Public ReadOnly PartNumber As
 Integer
    Public ReadOnly Description As
 String
    Public ReadOnly UnitPrice As
 Double
    
    Private _quantity As Integer
 = 0
    
    Public Sub New(ByVal
 partNumber As Integer, _
                   ByVal description As String,
 _
                   ByVal quantity As Integer,
 _
                   ByVal unitPrice As Double)
 
        Me.PartNumber = partNumber
        Me.Description = description
        Me.Quantity = quantity
        Me.UnitPrice = unitPrice
    End Sub 'New
    
    Public Property Quantity() As
 Integer 
        Get
            Return _quantity
        End Get
        Set
            If value < 0 Then
                Throw New ArgumentException("Quantity
 cannot be negative.")
            End If
            _quantity = value
        End Set
    End Property
        
    Public Overrides Function
 ToString() As String 
        Return String.Format( _
            "{0,9} {1,6} {2,-12} at {3,8:#,###.00} = {4,10:###,###.00}",
 _
            PartNumber, _quantity, Description, UnitPrice, _
            UnitPrice * _quantity)
    End Function
End Class

' This code example produces the following output:
'
'110072674    400 Widget       at    45.17 =  18,068.00
'110072675     27 Sprocket     at     5.30 =     143.10
'101030411     10 Motor        at   237.50 =   2,375.00
'110072684    175 Gear         at     5.17 =     904.75
'
'Contains(101030411): True
'
'weekly(101030411).Description: Motor
'
'Remove(101030411)
'
'110072674    400 Widget       at    45.17 =  18,068.00
'110072675     27 Sprocket     at     5.30 =     143.10
'110072684    175 Gear         at     5.17 =     904.75
'
'Insert(2, New OrderItem(...))
'
'110072674    400 Widget       at    45.17 =  18,068.00
'110072675     27 Sprocket     at     5.30 =     143.10
'111033401     10 Nut          at      .50 =       5.00
'110072684    175 Gear         at     5.17 =     904.75
'
'coweekly(2).Description: Nut
'
'coweekly(2) = New OrderItem(...)
'
'IndexOf(temp): 2
'
'Remove(temp)
'
'110072674    400 Widget       at    45.17 =  18,068.00
'110072675     27 Sprocket     at     5.30 =     143.10
'110072684    175 Gear         at     5.17 =     904.75
'
'RemoveAt(0)
'
'110072675     27 Sprocket     at     5.30 =     143.10
'110072684    175 Gear         at     5.17 =     904.75
C#
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

// This class represents a very simple keyed list of OrderItems,
// inheriting most of its behavior from the KeyedCollection and 
// Collection classes. The immediate base class is the constructed
// type KeyedCollection<int, OrderItem>. When you inherit
// from KeyedCollection, the second generic type argument is the 
// type that you want to store in the collection -- in this case
// OrderItem. The first type argument is the type that you want
// to use as a key. Its values must be calculated from OrderItem; 
// in this case it is the int field PartNumber, so SimpleOrder
// inherits KeyedCollection<int, OrderItem>.
//
public class SimpleOrder : KeyedCollection<int,
 OrderItem>
{
    // The parameterless constructor of the base class creates a 
    // KeyedCollection with an internal dictionary. For this code 
    // example, no other constructors are exposed.
    //
    public SimpleOrder() : base() {}
    
    // This is the only method that absolutely must be overridden,
    // because without it the KeyedCollection cannot extract the
    // keys from the items. The input parameter type is the 
    // second generic type argument, in this case OrderItem, and 
    // the return value type is the first generic type argument,
    // in this case int.
    //
    protected override int GetKeyForItem(OrderItem
 item)
    {
        // In this example, the key is the part number.
        return item.PartNumber;
    }
}

public class Demo
{    
    public static void Main()
    {
        SimpleOrder weekly = new SimpleOrder();

        // The Add method, inherited from Collection, takes OrderItem.
        //
        weekly.Add(new OrderItem(110072674, "Widget",
 400, 45.17));
        weekly.Add(new OrderItem(110072675, "Sprocket",
 27, 5.3));
        weekly.Add(new OrderItem(101030411, "Motor",
 10, 237.5));
        weekly.Add(new OrderItem(110072684, "Gear",
 175, 5.17));
        
        Display(weekly);
    
        // The Contains method of KeyedCollection takes the key, 
        // type, in this case int.
        //
        Console.WriteLine("\nContains(101030411): {0}", 
            weekly.Contains(101030411));

        // The default Item property of KeyedCollection takes a key.
        //
        Console.WriteLine("\nweekly[101030411].Description: {0}", 
            weekly[101030411].Description);

        // The Remove method of KeyedCollection takes a key.
        //
        Console.WriteLine("\nRemove(101030411)");
        weekly.Remove(101030411);
        Display(weekly);

        // The Insert method, inherited from Collection, takes an 
        // index and an OrderItem.
        //
        Console.WriteLine("\nInsert(2, New OrderItem(...))");
        weekly.Insert(2, new OrderItem(111033401, "Nut",
 10, .5));
        Display(weekly);

        // The default Item property is overloaded. One overload comes
        // from KeyedCollection<int, OrderItem>; that overload
        // is read-only, and takes Integer because it retrieves by key.
 
        // The other overload comes from Collection<OrderItem>,
 the 
        // base class of KeyedCollection<int, OrderItem>; it 
        // retrieves by index, so it also takes an Integer. The compiler
        // uses the most-derived overload, from KeyedCollection, so
 the
        // only way to access SimpleOrder by index is to cast it to
        // Collection<OrderItem>. Otherwise the index is interpreted
        // as a key, and KeyNotFoundException is thrown.
        //
        Collection<OrderItem> coweekly = weekly;
        Console.WriteLine("\ncoweekly[2].Description: {0}", 
            coweekly[2].Description);
 
        Console.WriteLine("\ncoweekly[2] = new OrderItem(...)");
        coweekly[2] = new OrderItem(127700026, "Crank",
 27, 5.98);

        OrderItem temp = coweekly[2];

        // The IndexOf method inherited from Collection<OrderItem>
 
        // takes an OrderItem instead of a key
        // 
        Console.WriteLine("\nIndexOf(temp): {0}", weekly.IndexOf(temp));

        // The inherited Remove method also takes an OrderItem.
        //
        Console.WriteLine("\nRemove(temp)");
        weekly.Remove(temp);
        Display(weekly);

        Console.WriteLine("\nRemoveAt(0)");
        weekly.RemoveAt(0);
        Display(weekly);

    }
    
    private static void
 Display(SimpleOrder order)
    {
        Console.WriteLine();
        foreach( OrderItem item in order )
        {
            Console.WriteLine(item);
        }
    }
}

// This class represents a simple line item in an order. All the 
// values are immutable except quantity.
// 
public class OrderItem
{
    public readonly int PartNumber;
    public readonly string Description;
    public readonly double UnitPrice;
    
    private int _quantity = 0;
    
    public OrderItem(int partNumber, string
 description, 
        int quantity, double unitPrice)
    {
        this.PartNumber = partNumber;
        this.Description = description;
        this.Quantity = quantity;
        this.UnitPrice = unitPrice;
    } 
    
    public int Quantity    
    {
        get { return _quantity; }
        set
        {
            if (value<0)
                throw new ArgumentException("Quantity cannot
 be negative.");
            
            _quantity = value;
        }
    }
        
    public override string ToString()
    {
        return String.Format(
            "{0,9} {1,6} {2,-12} at {3,8:#,###.00} = {4,10:###,###.00}",
 
            PartNumber, _quantity, Description, UnitPrice, 
            UnitPrice * _quantity);
    }
}

/* This code example produces the following output:

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
101030411     10 Motor        at   237.50 =   2,375.00
110072684    175 Gear         at     5.17 =     904.75

Contains(101030411): True

weekly[101030411].Description: Motor

Remove(101030411)

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
110072684    175 Gear         at     5.17 =     904.75

Insert(2, New OrderItem(...))

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
111033401     10 Nut          at      .50 =       5.00
110072684    175 Gear         at     5.17 =     904.75

coweekly[2].Description: Nut

coweekly[2] = new OrderItem(...)

IndexOf(temp): 2

Remove(temp)

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
110072684    175 Gear         at     5.17 =     904.75

RemoveAt(0)

110072675     27 Sprocket     at     5.30 =     143.10
110072684    175 Gear         at     5.17 =     904.75
 */
C++
using namespace System;
using namespace System::Collections::Generic;
using namespace System::Collections::ObjectModel;

// This class represents a simple line item in an order. All the 
// values are immutable except quantity.
// 
public ref class OrderItem
{
private:
    int _quantity;
    
public:
    initonly int PartNumber;
    initonly String^ Description;
    initonly double UnitPrice;
    
    OrderItem(int partNumber, String^ description, 
        int quantity, double unitPrice)
    {
        this->PartNumber = partNumber;
        this->Description = description;
        this->Quantity = quantity;
        this->UnitPrice = unitPrice;
    } 
    
    property int Quantity    
    {
        int get() { return
 _quantity; }
        void set(int value)
        {
            if (value < 0)
                throw gcnew ArgumentException("Quantity cannot be negative.");
            
            _quantity = value;
        }
    }
        
    virtual String^ ToString() override 
    {
        return String::Format(
            "{0,9} {1,6} {2,-12} at {3,8:#,###.00} = {4,10:###,###.00}",
 
            PartNumber, _quantity, Description, UnitPrice, 
            UnitPrice * _quantity);
    }
};

// This class represents a very simple keyed list of OrderItems,
// inheriting most of its behavior from the KeyedCollection and 
// Collection classes. The immediate base class is the constructed
// type KeyedCollection<int, OrderItem>. When you inherit
// from KeyedCollection, the second generic type argument is the 
// type that you want to store in the collection -- in this case
// OrderItem. The first type argument is the type that you want
// to use as a key. Its values must be calculated from OrderItem; 
// in this case it is the int field PartNumber, so SimpleOrder
// inherits KeyedCollection<int, OrderItem>.
//
public ref class SimpleOrder : KeyedCollection<int,
 OrderItem^>
{
    // The parameterless constructor of the base class creates a 
    // KeyedCollection with an internal dictionary. For this code 
    // example, no other constructors are exposed.
    //
public:
    SimpleOrder() {}
    
    // This is the only method that absolutely must be overridden,
    // because without it the KeyedCollection cannot extract the
    // keys from the items. The input parameter type is the 
    // second generic type argument, in this case OrderItem, and 
    // the return value type is the first generic type argument,
    // in this case int.
    //
protected:
    virtual int GetKeyForItem(OrderItem^ item) override 
    {
        // In this example, the key is the part number.
        return item->PartNumber;
    }
};

public ref class Demo
{    
public:
    static void Main()
    {
        SimpleOrder^ weekly = gcnew SimpleOrder();

        // The Add method, inherited from Collection, takes OrderItem.
        //
        weekly->Add(gcnew OrderItem(110072674, "Widget", 400, 45.17));
        weekly->Add(gcnew OrderItem(110072675, "Sprocket", 27, 5.3));
        weekly->Add(gcnew OrderItem(101030411, "Motor", 10, 237.5));
        weekly->Add(gcnew OrderItem(110072684, "Gear", 175, 5.17));
        
        Display(weekly);
    
        // The Contains method of KeyedCollection takes the key, 
        // type, in this case int.
        //
        Console::WriteLine("\nContains(101030411): {0}", 
            weekly->Contains(101030411));

        // The default Item property of KeyedCollection takes a key.
        //
        Console::WriteLine("\nweekly(101030411)->Description: {0}",
 
            weekly[101030411]->Description);

        // The Remove method of KeyedCollection takes a key.
        //
        Console::WriteLine("\nRemove(101030411)");
        weekly->Remove(101030411);
        Display(weekly);

        // The Insert method, inherited from Collection, takes an 
        // index and an OrderItem.
        //
        Console::WriteLine("\nInsert(2, New OrderItem(...))");
        weekly->Insert(2, gcnew OrderItem(111033401, "Nut", 10, .5));
        Display(weekly);

        // The default Item property is overloaded. One overload comes
        // from KeyedCollection<int, OrderItem>; that overload
        // is read-only, and takes Integer because it retrieves by key.
 
        // The other overload comes from Collection<OrderItem>,
 the 
        // base class of KeyedCollection<int, OrderItem>; it 
        // retrieves by index, so it also takes an Integer. The compiler
        // uses the most-derived overload, from KeyedCollection, so
 the
        // only way to access SimpleOrder by index is to cast it to
        // Collection<OrderItem>. Otherwise the index is interpreted
        // as a key, and KeyNotFoundException is thrown.
        //
        Collection<OrderItem^>^ coweekly = weekly;
        Console::WriteLine("\ncoweekly[2].Description: {0}", 
            coweekly[2]->Description);
 
        Console::WriteLine("\ncoweekly[2] = gcnew OrderItem(...)");
        coweekly[2] = gcnew OrderItem(127700026, "Crank", 27, 5.98);

        OrderItem^ temp = coweekly[2];

        // The IndexOf method inherited from Collection<OrderItem>
 
        // takes an OrderItem instead of a key
        // 
        Console::WriteLine("\nIndexOf(temp): {0}", weekly->IndexOf(temp));

        // The inherited Remove method also takes an OrderItem.
        //
        Console::WriteLine("\nRemove(temp)");
        weekly->Remove(temp);
        Display(weekly);

        Console::WriteLine("\nRemoveAt(0)");
        weekly->RemoveAt(0);
        Display(weekly);

    }
    
private:
    static void Display(SimpleOrder^ order)
    {
        Console::WriteLine();
        for each( OrderItem^ item in order
 )
        {
            Console::WriteLine(item);
        }
    }
};

void main()
{
    Demo::Main();
}

/* This code example produces the following output:

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
101030411     10 Motor        at   237.50 =   2,375.00
110072684    175 Gear         at     5.17 =     904.75

Contains(101030411): True

weekly(101030411)->Description: Motor

Remove(101030411)

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
110072684    175 Gear         at     5.17 =     904.75

Insert(2, New OrderItem(...))

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
111033401     10 Nut          at      .50 =       5.00
110072684    175 Gear         at     5.17 =     904.75

coweekly(2)->Description: Nut

coweekly[2] = gcnew OrderItem(...)

IndexOf(temp): 2

Remove(temp)

110072674    400 Widget       at    45.17 =  18,068.00
110072675     27 Sprocket     at     5.30 =     143.10
110072684    175 Gear         at     5.17 =     904.75

RemoveAt(0)

110072675     27 Sprocket     at     5.30 =     143.10
110072684    175 Gear         at     5.17 =     904.75
 */
プラットフォームプラットフォーム

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
参照参照
関連項目
KeyedCollection ジェネリック クラス
KeyedCollection メンバ
System.Collections.ObjectModel 名前空間
KeyedCollection.ChangeItemKey メソッド
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KeyedCollection.GetKeyForItem メソッドのお隣キーワード

KeyedCollection メンバ

KeyedCollection.ChangeItemKey メソッド

KeyedCollection.ClearItems メソッド

KeyedCollection.Comparer プロパティ

KeyedCollection.Contains メソッド

KeyedCollection.Dictionary プロパティ

KeyedCollection.GetKeyForItem メソッド

KeyedCollection.InsertItem メソッド

KeyedCollection.Item プロパティ

KeyedCollection.Remove メソッド

KeyedCollection.RemoveItem メソッド

KeyedCollection.SetItem メソッド

KeyedHashAlgorithm クラス

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