Array - IndexOf

Searches for the specified object and returns the index of the first occurrence within the entire one-dimensional.

Try it

public static void Main()
{
   String[] strings = { "the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog", "in", "the", "barn" };
   
   String searchString = "jumps";

	// C# Extension Method: Array - IndexOf
    int index = strings.IndexOf(searchString);

    Console.WriteLine("The first occurrence of \"{0}\" is at index {1}.",
                     searchString, index);
}

View Source 
using System;

public static partial class Extensions
{
    /// <summary>
    ///     Searches for the specified object and returns the index of the first occurrence within the entire one-
    ///     dimensional .
    /// </summary>
    /// <param name="array">The one-dimensional  to search.</param>
    /// <param name="value">The object to locate in .</param>
    /// <returns>
    ///     The index of the first occurrence of  within the entire , if found; otherwise, the lower bound of the array
    ///     minus 1.
    /// </returns>
    public static Int32 IndexOf(this Array array, Object value)
    {
        return Array.IndexOf(array, value);
    }

    /// <summary>
    ///     Searches for the specified object and returns the index of the first occurrence within the range of elements
    ///     in the one-dimensional  that extends from the specified index to the last element.
    /// </summary>
    /// <param name="array">The one-dimensional  to search.</param>
    /// <param name="value">The object to locate in .</param>
    /// <param name="startIndex">The starting index of the search. 0 (zero) is valid in an empty array.</param>
    /// <returns>
    ///     The index of the first occurrence of  within the range of elements in  that extends from  to the last element,
    ///     if found; otherwise, the lower bound of the array minus 1.
    /// </returns>
    public static Int32 IndexOf(this Array array, Object value, Int32 startIndex)
    {
        return Array.IndexOf(array, value, startIndex);
    }

    /// <summary>
    ///     Searches for the specified object and returns the index of the first occurrence within the range of elements
    ///     in the one-dimensional  that starts at the specified index and contains the specified number of elements.
    /// </summary>
    /// <param name="array">The one-dimensional  to search.</param>
    /// <param name="value">The object to locate in .</param>
    /// <param name="startIndex">The starting index of the search. 0 (zero) is valid in an empty array.</param>
    /// <param name="count">The number of elements in the section to search.</param>
    /// <returns>
    ///     The index of the first occurrence of  within the range of elements in  that starts at  and contains the
    ///     number of elements specified in , if found; otherwise, the lower bound of the array minus 1.
    /// </returns>
    public static Int32 IndexOf(this Array array, Object value, Int32 startIndex, Int32 count)
    {
        return Array.IndexOf(array, value, startIndex, count);
    }
}