Question

How to use Array.BinarySearch() method in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] arr = { "C#", "C", "PHP", "C++", "VB.NET" };

            Array.Sort(arr);

            foreach (string value in arr)
                Console.WriteLine(value);

            Console.WriteLine();

            try
            {
                int index = Array.BinarySearch(arr, "C++");
                Console.WriteLine("arr[{0}] = {1}", index, arr[index]);
            }
            catch (Exception e)
            {
                Console.WriteLine("{0} - {1}", e.GetType(), e.Message);
            }
        }
    }
}


/*
run:
 
C
C#
C++
PHP
VB.NET

arr[2] = C++
 
*/

 

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Answer 2

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "dd", "ff", "cc", "bb", "ee", "aa" };

            int i = Array.BinarySearch(array, "ff");

            try
            {
                Console.WriteLine(i); // -7
                Console.WriteLine(array[i]); // Error - array not sorted
            }
            catch (Exception e)
            {
                Console.WriteLine("{0} - {1}", e.GetType(), e.Message);
            }
        }
    }
}


/*
run:

-7
System.IndexOutOfRangeException - Index was outside the bounds of the array.

*/

 

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