HybridDictionary.Clear メソッド
HybridDictionary からすべてのエントリを削除します。
名前空間: System.Collections.Specialized
アセンブリ: System (system.dll 内)
構文
'宣言
Public Sub Clear
'使用
Dim instance As HybridDictionary
instance.Clear
public void Clear ()
public:
virtual void Clear () sealed
public final void Clear ()
public final function Clear ()
解説
Count は 0 に設定され、コレクションの要素からの他のオブジェクトへの参照も解放されます。
そのコレクションが Hashtable に既に格納されている場合、そのコレクションは Hashtable に残ります。
このメソッドは O(n) 操作です。ここで、n は Count です。
使用例
HybridDictionary に対して要素を追加および削除するコード例を次に示します。
Imports System
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesHybridDictionary
Public Shared Sub Main()
' Creates and initializes a new HybridDictionary.
Dim myCol As New HybridDictionary()
myCol.Add("Braeburn Apples", "1.49")
myCol.Add("Fuji Apples", "1.29")
myCol.Add("Gala Apples", "1.49")
myCol.Add("Golden Delicious Apples", "1.29")
myCol.Add("Granny Smith Apples", "0.89")
myCol.Add("Red Delicious Apples", "0.99")
myCol.Add("Plantain Bananas", "1.49")
myCol.Add("Yellow Bananas", "0.79")
myCol.Add("Strawberries", "3.33")
myCol.Add("Cranberries", "5.98")
myCol.Add("Navel Oranges", "1.29")
myCol.Add("Grapes", "1.99")
myCol.Add("Honeydew Melon", "0.59")
myCol.Add("Seedless Watermelon", "0.49")
myCol.Add("Pineapple", "1.49")
myCol.Add("Nectarine", "1.99")
myCol.Add("Plums", "1.69")
myCol.Add("Peaches", "1.99")
' Displays the values in the HybridDictionary in three different ways.
Console.WriteLine("Initial contents of the HybridDictionary:")
PrintKeysAndValues(myCol)
' Deletes a key.
myCol.Remove("Plums")
Console.WriteLine("The collection contains the following elements after removing ""Plums"":")
PrintKeysAndValues(myCol)
' Clears the entire collection.
myCol.Clear()
Console.WriteLine("The collection contains the following elements after it is cleared:")
PrintKeysAndValues(myCol)
End Sub 'Main
Public Shared Sub PrintKeysAndValues(myCol As IDictionary)
Console.WriteLine(" KEY VALUE")
Dim de As DictionaryEntry
For Each de In myCol
Console.WriteLine(" {0,-25} {1}", de.Key, de.Value)
Next de
Console.WriteLine()
End Sub 'PrintKeysAndValues
End Class 'SamplesHybridDictionary
'This code produces the following output.
'
'Initial contents of the HybridDictionary:
' KEY VALUE
' Seedless Watermelon 0.49
' Nectarine 1.99
' Cranberries 5.98
' Plantain Bananas 1.49
' Honeydew Melon 0.59
' Pineapple 1.49
' Strawberries 3.33
' Grapes 1.99
' Braeburn Apples 1.49
' Peaches 1.99
' Red Delicious Apples 0.99
' Golden Delicious Apples 1.29
' Yellow Bananas 0.79
' Granny Smith Apples 0.89
' Gala Apples 1.49
' Plums 1.69
' Navel Oranges 1.29
' Fuji Apples 1.29
'
'The collection contains the following elements after removing "Plums":
' KEY VALUE
' Seedless Watermelon 0.49
' Nectarine 1.99
' Cranberries 5.98
' Plantain Bananas 1.49
' Honeydew Melon 0.59
' Pineapple 1.49
' Strawberries 3.33
' Grapes 1.99
' Braeburn Apples 1.49
' Peaches 1.99
' Red Delicious Apples 0.99
' Golden Delicious Apples 1.29
' Yellow Bananas 0.79
' Granny Smith Apples 0.89
' Gala Apples 1.49
' Navel Oranges 1.29
' Fuji Apples 1.29
'
'The collection contains the following elements after it is cleared:
' KEY VALUE
'
using System;
using System.Collections;
using System.Collections.Specialized;
public class SamplesHybridDictionary {
public static void Main() {
// Creates and initializes a new HybridDictionary.
HybridDictionary myCol = new HybridDictionary();
myCol.Add( "Braeburn Apples", "1.49" );
myCol.Add( "Fuji Apples", "1.29" );
myCol.Add( "Gala Apples", "1.49" );
myCol.Add( "Golden Delicious Apples", "1.29" );
myCol.Add( "Granny Smith Apples", "0.89" );
myCol.Add( "Red Delicious Apples", "0.99" );
myCol.Add( "Plantain Bananas", "1.49" );
myCol.Add( "Yellow Bananas", "0.79" );
myCol.Add( "Strawberries", "3.33" );
myCol.Add( "Cranberries", "5.98" );
myCol.Add( "Navel Oranges", "1.29" );
myCol.Add( "Grapes", "1.99" );
myCol.Add( "Honeydew Melon", "0.59" );
myCol.Add( "Seedless Watermelon", "0.49" );
myCol.Add( "Pineapple", "1.49" );
myCol.Add( "Nectarine", "1.99" );
myCol.Add( "Plums", "1.69" );
myCol.Add( "Peaches", "1.99" );
// Displays the values in the HybridDictionary in three different ways.
Console.WriteLine( "Initial contents of the HybridDictionary:" );
PrintKeysAndValues( myCol );
// Deletes a key.
myCol.Remove( "Plums" );
Console.WriteLine( "The collection contains the following elements after removing \"Plums\":" );
PrintKeysAndValues( myCol );
// Clears the entire collection.
myCol.Clear();
Console.WriteLine( "The collection contains the following elements after it is cleared:" );
PrintKeysAndValues( myCol );
}
public static void PrintKeysAndValues( IDictionary myCol ) {
Console.WriteLine( " KEY VALUE" );
foreach ( DictionaryEntry de in myCol )
Console.WriteLine( " {0,-25} {1}", de.Key, de.Value );
Console.WriteLine();
}
}
/*
This code produces the following output.
Initial contents of the HybridDictionary:
KEY VALUE
Seedless Watermelon 0.49
Nectarine 1.99
Cranberries 5.98
Plantain Bananas 1.49
Honeydew Melon 0.59
Pineapple 1.49
Strawberries 3.33
Grapes 1.99
Braeburn Apples 1.49
Peaches 1.99
Red Delicious Apples 0.99
Golden Delicious Apples 1.29
Yellow Bananas 0.79
Granny Smith Apples 0.89
Gala Apples 1.49
Plums 1.69
Navel Oranges 1.29
Fuji Apples 1.29
The collection contains the following elements after removing "Plums":
KEY VALUE
Seedless Watermelon 0.49
Nectarine 1.99
Cranberries 5.98
Plantain Bananas 1.49
Honeydew Melon 0.59
Pineapple 1.49
Strawberries 3.33
Grapes 1.99
Braeburn Apples 1.49
Peaches 1.99
Red Delicious Apples 0.99
Golden Delicious Apples 1.29
Yellow Bananas 0.79
Granny Smith Apples 0.89
Gala Apples 1.49
Navel Oranges 1.29
Fuji Apples 1.29
The collection contains the following elements after it is cleared:
KEY VALUE
*/
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void PrintKeysAndValues( IDictionary^ myCol )
{
Console::WriteLine( " KEY VALUE" );
IEnumerator^ myEnum = myCol->GetEnumerator();
while ( myEnum->MoveNext() )
{
DictionaryEntry de = safe_cast<DictionaryEntry>(myEnum->Current);
Console::WriteLine( " {0,-25} {1}", de.Key, de.Value );
}
Console::WriteLine();
}
int main()
{
// Creates and initializes a new HybridDictionary.
HybridDictionary^ myCol = gcnew HybridDictionary;
myCol->Add( "Braeburn Apples", "1.49" );
myCol->Add( "Fuji Apples", "1.29" );
myCol->Add( "Gala Apples", "1.49" );
myCol->Add( "Golden Delicious Apples", "1.29" );
myCol->Add( "Granny Smith Apples", "0.89" );
myCol->Add( "Red Delicious Apples", "0.99" );
myCol->Add( "Plantain Bananas", "1.49" );
myCol->Add( "Yellow Bananas", "0.79" );
myCol->Add( "Strawberries", "3.33" );
myCol->Add( "Cranberries", "5.98" );
myCol->Add( "Navel Oranges", "1.29" );
myCol->Add( "Grapes", "1.99" );
myCol->Add( "Honeydew Melon", "0.59" );
myCol->Add( "Seedless Watermelon", "0.49" );
myCol->Add( "Pineapple", "1.49" );
myCol->Add( "Nectarine", "1.99" );
myCol->Add( "Plums", "1.69" );
myCol->Add( "Peaches", "1.99" );
// Displays the values in the HybridDictionary in three different ways.
Console::WriteLine( "Initial contents of the HybridDictionary:" );
PrintKeysAndValues( myCol );
// Deletes a key.
myCol->Remove( "Plums" );
Console::WriteLine( "The collection contains the following elements after removing \"Plums\":" );
PrintKeysAndValues( myCol );
// Clears the entire collection.
myCol->Clear();
Console::WriteLine( "The collection contains the following elements after it is cleared:" );
PrintKeysAndValues( myCol );
}
/*
This code produces the following output.
Initial contents of the HybridDictionary:
KEY VALUE
Seedless Watermelon 0.49
Nectarine 1.99
Cranberries 5.98
Plantain Bananas 1.49
Honeydew Melon 0.59
Pineapple 1.49
Strawberries 3.33
Grapes 1.99
Braeburn Apples 1.49
Peaches 1.99
Red Delicious Apples 0.99
Golden Delicious Apples 1.29
Yellow Bananas 0.79
Granny Smith Apples 0.89
Gala Apples 1.49
Plums 1.69
Navel Oranges 1.29
Fuji Apples 1.29
The collection contains the following elements after removing "Plums":
KEY VALUE
Seedless Watermelon 0.49
Nectarine 1.99
Cranberries 5.98
Plantain Bananas 1.49
Honeydew Melon 0.59
Pineapple 1.49
Strawberries 3.33
Grapes 1.99
Braeburn Apples 1.49
Peaches 1.99
Red Delicious Apples 0.99
Golden Delicious Apples 1.29
Yellow Bananas 0.79
Granny Smith Apples 0.89
Gala Apples 1.49
Navel Oranges 1.29
Fuji Apples 1.29
The collection contains the following elements after it is cleared:
KEY VALUE
*/
import System.*;
import System.Collections.*;
import System.Collections.Specialized.*;
public class SamplesHybridDictionary
{
public static void main(String[] args)
{
// Creates and initializes a new HybridDictionary.
HybridDictionary myCol = new HybridDictionary();
myCol.Add("Braeburn Apples", "1.49");
myCol.Add("Fuji Apples", "1.29");
myCol.Add("Gala Apples", "1.49");
myCol.Add("Golden Delicious Apples", "1.29");
myCol.Add("Granny Smith Apples", "0.89");
myCol.Add("Red Delicious Apples", "0.99");
myCol.Add("Plantain Bananas", "1.49");
myCol.Add("Yellow Bananas", "0.79");
myCol.Add("Strawberries", "3.33");
myCol.Add("Cranberries", "5.98");
myCol.Add("Navel Oranges", "1.29");
myCol.Add("Grapes", "1.99");
myCol.Add("Honeydew Melon", "0.59");
myCol.Add("Seedless Watermelon", "0.49");
myCol.Add("Pineapple", "1.49");
myCol.Add("Nectarine", "1.99");
myCol.Add("Plums", "1.69");
myCol.Add("Peaches", "1.99");
// Displays the values in the HybridDictionary in three different ways.
Console.WriteLine("Initial contents of the HybridDictionary:");
PrintKeysAndValues(myCol);
// Deletes a key.
myCol.Remove("Plums");
Console.WriteLine("The collection contains the following elements"
+ " after removing \"Plums\":");
PrintKeysAndValues(myCol);
// Clears the entire collection.
myCol.Clear();
Console.WriteLine("The collection contains the following elements"
+ " after it is cleared:");
PrintKeysAndValues(myCol);
} //main
public static void PrintKeysAndValues(IDictionary myCol)
{
IEnumerator objEnum = myCol.GetEnumerator();
Console.WriteLine(" KEY VALUE");
while (objEnum.MoveNext()) {
DictionaryEntry de = (DictionaryEntry)objEnum.get_Current();
Console.WriteLine(" {0,-25} {1}", de.get_Key(), de.get_Value());
}
Console.WriteLine();
} //PrintKeysAndValues
} //SamplesHybridDictionary
/*
This code produces the following output.
Initial contents of the HybridDictionary:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection contains the following elements after removing "Plums":
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection contains the following elements after it is cleared:
KEY VALUE
*/
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、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0
参照
関連項目
HybridDictionary クラス
HybridDictionary メンバ
System.Collections.Specialized 名前空間
IDictionary.Clear