C# List FindIndex(Int32, Int32, Predicate)

Description

List FindIndex(Int32, 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 List that starts at the specified index and contains the specified number of elements.

Syntax

public int FindIndex(
  int startIndex,
  int count,/*from w  w  w  .  j  a v a 2  s . c  o m*/
  Predicate<T> match
)

Parameters

• startIndex - The zero-based starting index of the search.
• count - The number of elements in the section to search.
• match - The Predicate delegate that defines the conditions of the element to search for.

Returns

List.FindIndex(Int32, 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

using System;//from  w w w. ja v a  2  s. c om
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;

class Program
{
    private static List<Book> Books = new List<Book>();
    public static void Main(string[] args)
    {
        int ndx = Books.FindIndex(1,2,FindComputer);
    }
    private static bool FindComputer(Book bk)
    {

        if (bk.Genre == "Computer")
        {
            return true;
        }else{
            return false;
        }

    }
}

public class Book
{
    public string Genre { get; set; }
}