Find an index of a value in a matrix

Question

I’m looking for a matrix index for a value:

List<string> list = new List<string>() { "Leão", "Guepardo", "Elefante" };
String[] array = new String[3] { "Leão", "Guepardo", "Elefante" };

For example, I want to search the value index "Elephant", how can I do that? Do you have any method? , the linq is able to do this search and return me an index?

Answer 1

Index

Searches the specified object and returns the zero-based index of first occurrence within the entire List

 list.IndexOf("Elefante")

Array.Indexof

Searches the specified object and returns the index of the first occurrence in a one-dimensional matrix.

Array.IndexOf(array, "Elefante")

^{Running on dot.net fiddle}

Answer 2

I think this might solve your problem:

int index = list.FindIndex(a => a == "Elefante");

Do a linear search to get the index.

Answer 3

To the array has it:

Array.IndexOf(array, "Elefante")

For list is:

list.IndexOf("Elefante")

Example:

using System;
using static System.Console;
using System.Collections.Generic;

public class Program {
    public static void Main() {
        var list = new List<string>() { "Leão", "Guepardo", "Elefante" };
        var array = new string[3] { "Leão", "Guepardo", "Elefante" };
        WriteLine(list.IndexOf("Elefante"));
        WriteLine(Array.IndexOf(array, "Elefante"));
    }
}

Behold working in the ideone. And in the .NET Fiddle. Also put on the Github for future reference.