NameObjectCollectionBase.BaseClear メソッド

.NET Framework クラス ライブラリ リファレンス

NameObjectCollectionBase.BaseClear メソッド

NameObjectCollectionBase インスタンス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

Visual Basic (宣言)

Protected Sub BaseClear

Visual Basic (使用法)

Me.BaseClear

C#

protected void BaseClear ()

C++

protected:
void BaseClear ()

J#

protected void BaseClear ()

JScript

protected function BaseClear ()

例外

例外の種類	条件
NotSupportedException	コレクションが読み取り専用です。

解説

Count はゼロに設定され、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。

このメソッドは O(1) 操作です。

使用例

BaseClear を使用して、すべての要素を NameObjectCollectionBase から削除する方法については、次のコード例を参照してください。

Visual Basic

Imports System
Imports System.Collections
Imports System.Collections.Specialized

Public Class MyCollection
   Inherits NameObjectCollectionBase

   Private _de As New DictionaryEntry()

   ' Gets a key-and-value pair (DictionaryEntry) using an index.
   Default Public ReadOnly
 Property Item(index As Integer)
 As DictionaryEntry
      Get
         _de.Key = Me.BaseGetKey(index)
         _de.Value = Me.BaseGet(index)
         Return _de
      End Get
   End Property

   ' Adds elements from an IDictionary into the new collection.
   Public Sub New(d As
 IDictionary)
      Dim de As DictionaryEntry
      For Each de In  d
         Me.BaseAdd(CType(de.Key, [String]), de.Value)
      Next de
   End Sub 'New

   ' Clears all the elements in the collection.
   Public Sub Clear()
      Me.BaseClear()
   End Sub 'Clear

End Class 'MyCollection


Public Class SamplesNameObjectCollectionBase
   

   Public Shared Sub Main()

      ' Creates and initializes a new MyCollection instance.
      Dim d = New ListDictionary()
      d.Add("red", "apple")
      d.Add("yellow", "banana")
      d.Add("green", "pear")
      Dim myCol As New MyCollection(d)
      Console.WriteLine("Initial state of the collection (Count
 = {0}):", myCol.Count)
      PrintKeysAndValues(myCol)

      ' Removes all elements from the collection.
      myCol.Clear()
      Console.WriteLine("After clearing the collection (Count
 = {0}):", myCol.Count)
      PrintKeysAndValues(myCol)

   End Sub 'Main

   Public Shared Sub PrintKeysAndValues(myCol
 As MyCollection)
      Dim i As Integer
      For i = 0 To myCol.Count - 1
         Console.WriteLine("[{0}] : {1}, {2}", i,
 myCol(i).Key, myCol(i).Value)
      Next i
   End Sub 'PrintKeysAndValues

End Class 'SamplesNameObjectCollectionBase
 


'This code produces the following output.
'
'Initial state of the collection (Count = 3):
'[0] : red, apple
'[1] : yellow, banana
'[2] : green, pear
'After clearing the collection (Count = 0):

C#

using System;
using System.Collections;
using System.Collections.Specialized;

public class MyCollection : NameObjectCollectionBase
  {

   private DictionaryEntry _de = new DictionaryEntry();

   // Gets a key-and-value pair (DictionaryEntry) using an index.
   public DictionaryEntry this[ int
 index ]  {
      get  {
         _de.Key = this.BaseGetKey( index );
         _de.Value = this.BaseGet( index );
         return( _de );
      }
   }

   // Adds elements from an IDictionary into the new collection.
   public MyCollection( IDictionary d )  {
      foreach ( DictionaryEntry de in d ) 
 {
         this.BaseAdd( (String) de.Key, de.Value );
      }
   }

   // Clears all the elements in the collection.
   public void Clear()  {
      this.BaseClear();
   }

}

public class SamplesNameObjectCollectionBase
  {

   public static void Main()
  {

      // Creates and initializes a new MyCollection instance.
      IDictionary d = new ListDictionary();
      d.Add( "red", "apple" );
      d.Add( "yellow", "banana" );
      d.Add( "green", "pear" );
      MyCollection myCol = new MyCollection( d );
      Console.WriteLine( "Initial state of the collection (Count = {0}):",
 myCol.Count );
      PrintKeysAndValues( myCol );

      // Removes all elements from the collection.
      myCol.Clear();
      Console.WriteLine( "After clearing the collection (Count = {0}):",
 myCol.Count );
      PrintKeysAndValues( myCol );

   }

   public static void PrintKeysAndValues(
 MyCollection myCol )  {
      for ( int i = 0; i < myCol.Count;
 i++ )  {
         Console.WriteLine( "[{0}] : {1}, {2}", i, myCol[i].Key, myCol[i].Value
 );
      }
   }

}


/*
This code produces the following output.

Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
After clearing the collection (Count = 0):

*/

C++

#using <system.dll>

using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
public ref class MyCollection: public
 NameObjectCollectionBase
{
private:
   DictionaryEntry _de;

public:

   property DictionaryEntry Item [ int ]
   {
      // Gets a key-and-value pair (DictionaryEntry) using an index.
      DictionaryEntry get( int index )
      {
         _de.Key = this->BaseGetKey( index );
         _de.Value = this->BaseGet( index );
         return (_de);
      }
   }

   // Adds elements from an IDictionary* into the new collection.
   MyCollection( IDictionary^ d )
   {
      IEnumerator^ myEnum = d->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         DictionaryEntry^ de = safe_cast<DictionaryEntry^>(myEnum->Current);
         this->BaseAdd( safe_cast<String^>(de->Key),
 de->Value );
      }
   }

   // Clears all the elements in the collection.
   void Clear()
   {
      this->BaseClear();
   }
};

static void PrintKeysAndValues( MyCollection^
 myCol )
{
   for ( int i = 0; i < myCol->Count;
 i++ )
   {
      Console::WriteLine( "[{0}] : {1}, {2}", i, myCol->Item[ i ].Key,
 myCol->Item[ i ].Value );

   }
}

int main()
{
   // Creates and initializes a new MyCollection instance.
   IDictionary^ d = gcnew ListDictionary;
   d->Add( "red", "apple" );
   d->Add( "yellow", "banana" );
   d->Add( "green", "pear" );
   MyCollection^ myCol = gcnew MyCollection( d );
   Console::WriteLine( "Initial state of the collection (Count = {0}):",
 myCol->Count );
   PrintKeysAndValues( myCol );

   // Removes all elements from the collection.
   myCol->Clear();
   Console::WriteLine( "After clearing the collection (Count = {0}):",
 myCol->Count );
   PrintKeysAndValues( myCol );
}

/*
This code produces the following output.

Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
After clearing the collection (Count = 0):

*/

J#

import System.* ;
import System.Collections.* ;
import System.Collections.Specialized.* ;

public class MyCollection extends NameObjectCollectionBase
{   
    private DictionaryEntry _de =  new DictionaryEntry();

    // Gets a key-and-value pair (DictionaryEntry) using an index.
    /** @property 
     */
    public DictionaryEntry get_Item(int index)
    {
        _de.set_Key(this.BaseGetKey(index));
        _de.set_Value(this.BaseGet(index));
        return _de ;
    } //get_Item

    // Adds elements from an IDictionary into the new collection.
    public MyCollection(IDictionary d)
    {
        IDictionaryEnumerator objEnum = d.GetEnumerator();

        while (objEnum.MoveNext()) {        
            DictionaryEntry de = (DictionaryEntry)objEnum.get_Current();
            this.BaseAdd(((String)(de.get_Key())), de.get_Value());
        }
    } //MyCollection

    // Clears all the elements in the collection.
    public void Clear() 
    {
        this.BaseClear();
    } //Clear
} //MyCollection


public class SamplesNameObjectCollectionBase
{
    public static void main(String[]
 args)
    {
        // Creates and initializes a new MyCollection instance.
        IDictionary d = new ListDictionary();
        d.Add("red", "apple");
        d.Add("yellow", "banana");
        d.Add("green", "pear");
        MyCollection myCol =  new MyCollection(d);
        Console.WriteLine("Initial state of the collection (Count = {0}):"
,
            System.Convert.ToString(myCol.get_Count()));
        PrintKeysAndValues(myCol);
        
        // Removes all elements from the collection.
        myCol.Clear();
        Console.WriteLine("After clearing the collection (Count = {0}):"
,
            System.Convert.ToString(myCol.get_Count()));
        PrintKeysAndValues(myCol);
    } //main

    public static void PrintKeysAndValues(MyCollection
 myCol)
    {
        for(int i=0 ; i < myCol.get_Count();
 i++) {        
            Console.WriteLine("[{0}] : {1}, {2}",System.Convert.ToString(i)
,
                myCol.get_Item(i).get_Key(), myCol.get_Item(i).get_Value());
        } 
    } //PrintKeysAndValues
} //SamplesNameObjectCollectionBase

/*
This code produces the following output.

Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
After clearing the collection (Count = 0):

*/

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
NameObjectCollectionBase クラス
NameObjectCollectionBase メンバ
System.Collections.Specialized 名前空間