C# Hashtable Contains

Description

Hashtable Contains determines whether the Hashtable contains a specific key.

Syntax

Hashtable.Contains has the following syntax.

public virtual bool Contains(
  Object key
)

Parameters

Hashtable.Contains has the following parameters.

• key - The key to locate in the Hashtable.

Returns

Hashtable.Contains method returns true if the Hashtable contains an element with the specified key; otherwise, false.

Example

The following example shows how to determine whether the Hashtable contains a specific element.

//from w  w  w.j a  v a 2 s. c o  m
using System;
using System.Collections;
public class SamplesHashtable  {

   public static void Main()  {
      Hashtable myHT = new Hashtable();
      myHT.Add( 0, "zero" );
      myHT.Add( 1, "one" );
      myHT.Add( 2, "two" );
      myHT.Add( 3, "three" );
      myHT.Add( 4, "four" );

      Console.WriteLine(myHT.Contains( 2 ));
      Console.WriteLine(myHT.ContainsKey( 2 ));
      Console.WriteLine(myHT.ContainsValue( "two" ));
   }
}

The code above generates the following result.