Hashtable.Clear Method

public virtual void Clear ()

public void Clear ()

public function Clear ()

Not applicable.

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-

*/ 

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-