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Array.LastIndexOf() Method in C#
The Array.LastIndexOf() method in C# is used to search for the specified object and returns the index of the last occurrence within the entire one-dimensional Array.
Syntax
public static int LastIndexOf (Array arr, object val);
Above, arr is the one-dimensional Array to search, whereas val is the object to locate in arr.
Example
using System;
public class Demo {
public static void Main() {
string[] strArr = {"John", "Tim", "Fedric", "Gary", "Harry", "Damien", "David", "Harry"};
Array.Sort(strArr);
Console.WriteLine("Array elements...");
foreach(string s in strArr) {
Console.WriteLine(s);
}
Console.Write("Element Gary is at index = " + Array.BinarySearch(strArr, "Gary"));
Console.Write("
Element Tom is at index = " + Array.BinarySearch(strArr, "Tom"));
Console.Write("
Last index of element Harry = " + Array.LastIndexOf(strArr, "Harry"));
}
}Output
Array elements... Damien David Fedric Gary Harry Harry John Tim Element Gary is at index = 3 Element Tom is at index = -9 Last index of element Harry = 5
Example
using System;
public class Demo {
public static void Main() {
int[] intArr = {5, 10, 15, 20, 15, 25, 30};
Array.Sort(intArr);
Console.WriteLine("Array elements...");
foreach(int i in intArr) {
Console.WriteLine(i);
}
Console.Write("Element 25 is at index = " + Array.BinarySearch(intArr, 20));
Console.Write("
Last index of element 15 = " + Array.LastIndexOf(intArr, 15));
Console.Write("
Last index of element 50 = " + Array.LastIndexOf(intArr, 50));
}
}Output
Array elements... 5 10 15 15 20 25 30 Element 25 is at index = 4 Last index of element 15 = 3 Last index of element 50 = -1
Updated on: 03-Dec-2019
2K+ Views
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