C# Array FindIndex(T[], Int32, Predicate)

Description

Array FindIndex (T[], Int32, Predicate )searches for an element that matches the conditions defined by the specified predicate, and returns the zero-based index of the first occurrence within the range of elements in the Array that extends from the specified index to the last element.

Syntax

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

public static int FindIndex<T>(
  T[] array,/*from   ww w  .jav  a  2 s .  c  o m*/
  int startIndex,
  Predicate<T> match
)

Parameters

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

• T - The type of the elements of the array.
• array - The one-dimensional, zero-based Array to search.
• startIndex - The zero-based starting index of the search.
• match - The Predicate that defines the conditions of the element to search for.

Returns

Array.FindIndex(T[], Int32, Predicate) method returns The zero-based index of the first occurrence of an element that matches the conditions defined by match, if found; otherwise, -1.

Example

/*from w w w  .  j  a  v a  2s.  c o m*/
using System;

public class MainClass
{
    public static void Main()
    {
        string[] myValues ={
            "1234", "19", "3456",
            "3456", "200","5678",
            "6543", "9876"
        };

        Predicate<string> myPredicate = LenCheck;
        Console.WriteLine(Array.FindIndex(myValues, 0, myPredicate));


    }
    private static bool LenCheck(String s)
    {
        if (s.Length > 3)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

The code above generates the following result.