Sorting and Searching an ArrayList
An ArrayList can be sorted by Sort( ). Once sorted, it can be efficiently searched by BinarySearch( ). The following program demonstrates these methods:
Example
using System;
using System.IO;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main()
{
// Create an array list.
ArrayList al = new ArrayList();
// Add elements to the array list.
al.Add(55);
al.Add(43);
al.Add(-4);
al.Add(88);
al.Add(3);
al.Add(19);
Console.Write("Original contents: ");
foreach (int i in al)
Console.Write(i + " ");
Console.WriteLine("\n");
// Sort
al.Sort();
// Use foreach loop to display the list.
Console.Write("Contents after sorting: ");
foreach (int i in al)
Console.Write(i + " ");
Console.WriteLine("\n");
Console.WriteLine("Index of 43 is " +
al.BinarySearch(43));
Console.Read();
}
}
}
