illustrates the use of the Hashtable methods

  
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
  Example11_7.cs illustrates the use of the Hashtable methods
*/

using System;
using System.Collections;

public class Example11_7
{

  public static void Main()
  {

    // create a Hashtable object
    Hashtable myHashtable = new Hashtable();

    // add elements containing US state abbreviations and state
    // names to myHashtable using the Add() method
    myHashtable.Add("AL", "Alabama");
    myHashtable.Add("CA", "California");
    myHashtable.Add("FL", "Florida");
    myHashtable.Add("NY", "New York");
    myHashtable.Add("WY", "Wyoming");

    // display the keys for myHashtable using the Keys property
    foreach (string myKey in myHashtable.Keys)
    {
      Console.WriteLine("myKey = " + myKey);
    }

    // display the values for myHashtable using the Values property
    foreach(string myValue in myHashtable.Values)
    {
      Console.WriteLine("myValue = " + myValue);
    }

    // use the ContainsKey() method to check if myHashtable
    // contains the key "FL"
    if (myHashtable.ContainsKey("FL"))
    {
      Console.WriteLine("myHashtable contains the key FL");
    }

    // use the ContainsValue() method to check if myHashtable
    // contains the value "Florida"
    if (myHashtable.ContainsValue("Florida"))
    {
      Console.WriteLine("myHashtable contains the value Florida");
    }

    // use the Remove() method to remove FL from myHashtable
    Console.WriteLine("Removing FL from myHashtable");
    myHashtable.Remove("FL");

    // get the number of elements in myHashtable using the Count
    // property
    int count = myHashtable.Count;

    // copy the keys from myHashtable into an array using
    // the CopyTo() method and then display the array contents
    Console.WriteLine("Copying keys to myKeys array");
    string[] myKeys = new string[count];
    myHashtable.Keys.CopyTo(myKeys, 0);
    for (int counter = 0; counter < myKeys.Length; counter++)
    {
      Console.WriteLine("myKeys[" + counter + "] = " +
        myKeys[counter]);
    }

    // copy the values from myHashtable into an array using
    // the CopyTo() method and then display the array contents
    Console.WriteLine("Copying values to myValues array");
    string[] myValues = new string[count];
    myHashtable.Values.CopyTo(myValues, 0);
    for (int counter = 0; counter < myValues.Length; counter++)
    {
      Console.WriteLine("myValues[" + counter + "] = " +
        myValues[counter]);
    }

  }

}

Related examples in the same category

1.	Compares the efficiency of the hash map implementation with the tree map
2.	Implement GetHashCode method and store it in a hashtable
3.	Add value to Hashtable and loop through the value key pairs
4.	Enumerating a hash table collection
5.	illustrates the use of a Hashtable
6.	Demonstrate Hashtable
7.	Get IDictionaryEnumerator enumerator from Hashtable
8.	Properties based on Hashtable
9.	DictionaryEntry Structure Defines a dictionary key/value pair that can be set or retrieved.
10.	Create Hashtable by copying the elements from the specified dictionary to the new Hashtable object.
11.	Hashtable.Clear Method removes all elements from the Hashtable.
12.	Hashtable.Contains Method determines whether the Hashtable contains a specific key.
13.	Hashtable.CopyTo Method copies the Hashtable elements to a one-dimensional Array instance at the specified index.
14.	Hashtable.GetEnumerator Method returns an IDictionaryEnumerator that iterates through the Hashtable.
15.	Hashtable.IsSynchronized Property gets a value indicating whether access to the Hashtable is synchronized (thread safe).
16.	Hashtable.Remove Method removes the element with the specified key from the Hashtable.
17.	IComparer Interface exposes a method that compares two objects.

illustrates the use of the Hashtable methods : Hashtable « Collections Data Structure « C# / C Sharp

Related examples in the same category