Hashtable.Clear 메서드

아티클
08/21/2007

Hashtable에서 요소를 모두 제거합니다.

네임스페이스: System.Collections
어셈블리: mscorlib(mscorlib.dll)

구문

‘선언
Public Overridable Sub Clear
‘사용 방법
Dim instance As Hashtable

instance.Clear

public virtual void Clear ()

public:
virtual void Clear ()

public void Clear ()

public function Clear ()

예외

예외 형식	조건
NotSupportedException	Hashtable가 읽기 전용인 경우

설명

Count는 0으로 설정되고, 컬렉션 요소의 다른 개체에 대한 참조도 해제됩니다. 용량은 변경되지 않습니다.

이 메서드는 O(n) 연산이며, 여기서 n은 Count입니다.

예제

다음 예제에서는 Hashtable의 값을 지우는 방법을 설명합니다.

Imports System
Imports System.Collections

Public Class SamplesHashtable

    Public Shared Sub Main()

        ' Creates and initializes a new Hashtable.
        Dim myHT As New Hashtable()
        myHT.Add("one", "The")
        myHT.Add("two", "quick")
        myHT.Add("three", "brown")
        myHT.Add("four", "fox")
        myHT.Add("five", "jumped")

        ' Displays the count and values of the Hashtable.
        Console.WriteLine("Initially,")
        Console.WriteLine("   Count    : {0}", myHT.Count)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(myHT)

        ' Clears the Hashtable.
        myHT.Clear()

        ' Displays the count and values of the Hashtable.
        Console.WriteLine("After Clear,")
        Console.WriteLine("   Count    : {0}", myHT.Count)
        Console.WriteLine("   Values:")
        PrintKeysAndValues(myHT)

    End Sub 'Main


    Public Shared Sub PrintKeysAndValues(myHT As Hashtable)
        Console.WriteLine(vbTab + "-KEY-" + vbTab + "-VALUE-")
        Dim de As DictionaryEntry
        For Each de In  myHT
            Console.WriteLine(vbTab + "{0}:" + vbTab + "{1}", de.Key, de.Value)
        Next de
        Console.WriteLine()
    End Sub 'PrintKeysAndValues

End Class 'SamplesHashtable 


' This code produces the following output.
' 
' Initially,
'    Count    : 5
'    Values:
'         -KEY-   -VALUE-
'         two:    quick
'         three:  brown
'         four:   fox
'         five:   jumped
'         one:    The
'
' After Clear,
'    Count    : 0
'    Values:
'         -KEY-   -VALUE-
'

using System;
using System.Collections;
public class SamplesHashtable  {

   public static void Main()  {

      // Creates and initializes a new Hashtable.
      Hashtable myHT = new Hashtable();
      myHT.Add( "one", "The" );
      myHT.Add( "two", "quick" );
      myHT.Add( "three", "brown" );
      myHT.Add( "four", "fox" );
      myHT.Add( "five", "jumped" );

      // Displays the count and values of the Hashtable.
      Console.WriteLine( "Initially," );
      Console.WriteLine( "   Count    : {0}", myHT.Count );
      Console.WriteLine( "   Values:" );
      PrintKeysAndValues( myHT );

      // Clears the Hashtable.
      myHT.Clear();

      // Displays the count and values of the Hashtable.
      Console.WriteLine( "After Clear," );
      Console.WriteLine( "   Count    : {0}", myHT.Count );
      Console.WriteLine( "   Values:" );
      PrintKeysAndValues( myHT );
   }


   public static void PrintKeysAndValues( Hashtable myHT )  {
      Console.WriteLine( "\t-KEY-\t-VALUE-" );
      foreach ( DictionaryEntry de in myHT )
         Console.WriteLine( "\t{0}:\t{1}", de.Key, de.Value );
      Console.WriteLine();
   }

}


/* 
This code produces the following output.

Initially,
   Count    : 5
   Values:
        -KEY-   -VALUE-
        two:    quick
        three:  brown
        four:   fox
        five:   jumped
        one:    The

After Clear,
   Count    : 0
   Values:
        -KEY-   -VALUE-

*/

using namespace System;
using namespace System::Collections;
void PrintKeysAndValues( Hashtable^ myHT );
int main()
{
   
   // Creates and initializes a new Hashtable.
   Hashtable^ myHT = gcnew Hashtable;
   myHT->Add( "one", "The" );
   myHT->Add( "two", "quick" );
   myHT->Add( "three", "brown" );
   myHT->Add( "four", "fox" );
   myHT->Add( "five", "jumped" );
   
   // Displays the count and values of the Hashtable.
   Console::WriteLine( "Initially," );
   Console::WriteLine( "   Count    : {0}", myHT->Count );
   Console::WriteLine( "   Values:" );
   PrintKeysAndValues( myHT );
   
   // Clears the Hashtable.
   myHT->Clear();
   
   // Displays the count and values of the Hashtable.
   Console::WriteLine( "After Clear," );
   Console::WriteLine( "   Count    : {0}", myHT->Count );
   Console::WriteLine( "   Values:" );
   PrintKeysAndValues( myHT );
}

void PrintKeysAndValues( Hashtable^ myHT )
{
   Console::WriteLine( "\t-KEY-\t-VALUE-" );
   IEnumerator^ myEnum = myHT->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      DictionaryEntry de = *safe_cast<DictionaryEntry ^>(myEnum->Current);
      Console::WriteLine( "\t{0}:\t{1}", de.Key, de.Value );
   }

   Console::WriteLine();
}

/* 
 This code produces the following output.
 
 Initially,
    Count    : 5
    Values:
         -KEY-   -VALUE-
         two:    quick
         three:  brown
         four:   fox
         five:   jumped
         one:    The

 After Clear,
    Count    : 0
    Values:
         -KEY-   -VALUE-

 */

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

public class SamplesHashtable
{
    public static void main(String[] args)
    {
        // Creates and initializes a new Hashtable.
        Hashtable myHT = new Hashtable();

        myHT.Add("one", "The");
        myHT.Add("two", "quick");
        myHT.Add("three", "brown");
        myHT.Add("four", "fox");
        myHT.Add("five", "jumped");

        // Displays the count and values of the Hashtable.
        Console.WriteLine("Initially,");
        Console.WriteLine("   Count    : {0}", 
            System.Convert.ToString(myHT.get_Count()));
        Console.WriteLine("   Values:");
        PrintKeysAndValues(myHT);

        // Clears the Hashtable.
        myHT.Clear();

        // Displays the count and values of the Hashtable.
        Console.WriteLine("After Clear,");
        Console.WriteLine("   Count    : {0}", 
            System.Convert.ToString(myHT.get_Count()));
        Console.WriteLine("   Values:");
        PrintKeysAndValues(myHT);
    } //main

    public static void PrintKeysAndValues(Hashtable myHT)
    {
        Console.WriteLine("\t-KEY-\t-VALUE-");
        IEnumerator myEnumerator = myHT.GetEnumerator();

        while (myEnumerator.MoveNext()) {
            DictionaryEntry de = (DictionaryEntry)myEnumerator.get_Current();
            Console.WriteLine("\t{0}:\t{1}", de.get_Key(), de.get_Value());
        }
        Console.WriteLine();
    } //PrintKeysAndValues
} //SamplesHashtable 

/* 
 This code produces the following output.
 
 Initially,
    Count    : 5
    Values:
         -KEY-   -VALUE-
         two:    quick
         three:  brown
         four:   fox
         five:   jumped
         one:    The

 After Clear,
    Count    : 0
    Values:
         -KEY-   -VALUE-
 */

import System
import System.Collections
import Microsoft.VisualBasic

// Creates and initializes a new Hashtable.
var myHT : Hashtable = new Hashtable()
myHT.Add("one", "The")
myHT.Add("two", "quick")
myHT.Add("three", "brown")
myHT.Add("four", "fox")
myHT.Add("five", "jumped")

// Displays the count and values of the Hashtable.
Console.WriteLine("Initially,")
Console.WriteLine("   Count    : {0}", myHT.Count)
Console.WriteLine("   Values:")
PrintKeysAndValues(myHT)

// Clears the Hashtable.
myHT.Clear()

// Displays the count and values of the Hashtable.
Console.WriteLine("After Clear,")
Console.WriteLine("   Count    : {0}", myHT.Count)
Console.WriteLine("   Values:")
PrintKeysAndValues(myHT)
    
function PrintKeysAndValues(myList : Hashtable){
    var myEnumerator : IDictionaryEnumerator = myList.GetEnumerator()
    Console.WriteLine("\t-KEY-\t-VALUE-")
    while(myEnumerator.MoveNext())
        Console.WriteLine("\t{0}:\t{1}", myEnumerator.Key, myEnumerator.Value)
    Console.WriteLine()
}

// This code produces the following output.
// 
// Initially,
//    Count    : 5
//    Values:
//     -KEY-    -VALUE-
//     five:    jumped
//     three:   brown
//     four:    fox
//     two:     quick
//     one:     The
// 
// After Clear,
//    Count    : 0
//    Values:
//     -KEY-    -VALUE-

플랫폼

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

.NET Framework에서 모든 플래폼의 모든 버전을 지원하지는 않습니다. 지원되는 버전의 목록은 시스템 요구 사항을 참조하십시오.

버전 정보

.NET Framework

2.0, 1.1, 1.0에서 지원

.NET Compact Framework

2.0, 1.0에서 지원

참고 항목

참조

Hashtable 클래스
Hashtable 멤버
System.Collections 네임스페이스
IDictionary.Clear

다음을 통해 공유

Hashtable.Clear 메서드

구문

예외

설명

예제

플랫폼

버전 정보

.NET Framework

.NET Compact Framework

참고 항목

참조

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