C# Array BinarySearch(Array, Object, IComparer)

Description

Array BinarySearch(Array, Object, IComparer) searches an entire one-dimensional sorted array for a value using the specified IComparer interface.

Syntax

Array.BinarySearch(Array, Object, IComparer) has the following syntax.


public static int BinarySearch(
  Array array,//from   www .ja  v a2 s.  c o m
  Object value,
  IComparer comparer
)

Parameters

Array.BinarySearch(Array, Object, IComparer) has the following parameters.

array - The sorted one-dimensional Array to search.
value - The object to search for.
comparer - The IComparer implementation to use when comparing elements.
comparer - -or-
comparer - null to use the IComparable implementation of each element.

Returns

Array.BinarySearch(Array, Object, IComparer) method returns The index of the specified value in the specified array, if value is found.

Example


//from   w ww . ja  v a 2  s .  com
using System;

public class SamplesArray
{
    public static void Main()
    {
        // Creates and initializes a new Array.
        Array myIntArray = Array.CreateInstance(typeof(String), 5);

        myIntArray.SetValue("a", 0);
        myIntArray.SetValue("b", 1);
        myIntArray.SetValue("c", 2);
        myIntArray.SetValue("d", 3);
        myIntArray.SetValue("java2s.com", 4);

        Array.Sort(myIntArray);

        object myObjectOdd = "c";
        FindMyObject(myIntArray, myObjectOdd);

    }

    public static void FindMyObject(Array myArr, object myObject)
    {
        int myIndex=Array.BinarySearch(myArr, myObject,StringComparer.CurrentCulture);
        if (myIndex < 0)
        {
            Console.WriteLine("The object to search for ({0}) is not found. The next larger object is at index {1}.", myObject, ~myIndex );
        }
        else
        {
            Console.WriteLine("The object to search for ({0}) is at index {1}.", myObject, myIndex );
        }
    }
}

The code above generates the following result.