C# Array IndexOf(T[], T, Int32, Int32)

Description

Array IndexOf(T[], T, Int32, Int32)searches for the specified object and returns the index of the first occurrence within the range of elements in the Array that starts at the specified index and contains the specified number of elements.

Syntax

Array.IndexOf(T[], T, Int32, Int32) has the following syntax.

public static int IndexOf<T>(
  T[] array,//from  w  w w  .  ja va  2 s.  com
  T value,
  int startIndex,
  int count
)

Parameters

Array.IndexOf(T[], T, Int32, Int32) has the following parameters.

• T - The type of the elements of the array.
• array - The one-dimensional, zero-based Array to search.
• value - The object to locate in array.
• startIndex - The zero-based starting index of the search. 0 (zero) is valid in an empty array.
• count - The number of elements in the section to search.

Returns

Array.IndexOf(T[], T, Int32, Int32) method returns The zero-based index of the first occurrence of value within the range of elements in array that starts at startIndex and contains the number of elements specified in count, if found; otherwise, -1.

Example

The following code example demonstrates all three generic overloads of the IndexOf method.

/*from w  ww. j  ava 2s  .c  om*/
using System;

public class Example
{
    public static void Main()
    {
        string[] myValues = { "2001",
            "1999",
            "2000",
            "1234",
            "2002",
            "2001",
            "4567" };


        Console.WriteLine(Array.IndexOf(myValues, "2001"));

        Console.WriteLine(Array.IndexOf(myValues, "2001", 3));

        Console.WriteLine(Array.IndexOf(myValues, "2001", 2, 2));
    }
}

The code above generates the following result.