C# | Array.FindLast() Method

Last Updated : 17 Dec, 2021

This method is used to search for an element that matches the conditions defined by the specified predicate and returns the last occurrence within the entire Array.

Syntax:

public static T FindLast<T> (T[] array, Predicate<T> match);

Parameters:

array: It is the one-dimensional, zero-based array to search.
match: It is the predicate that defines the conditions of the element to search for.

Return Value: This method returns the last element that matches the conditions defined by the specified predicate if it is found otherwise returns the default value for type T.

Exception: This method throws ArgumentNullException if the array is null or match is null.

Below programs illustrate the use of Array.FindLast(T[], Predicate) Method:

Example 1:

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// C# program to demonstrate 
// Array.FindLast(T[], Predicate<T>) 
// Method 
using System; 
using System.Collections.Generic; 
  
public class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        try { 
  
            // Creating and initializing 
            // new the String 
            String[] myArr = {"Sun", "Son", "Tue", "Thu"}; 
  
            // Display the values of the myArr. 
            Console.WriteLine("Initial Array:"); 
  
            // calling the PrintIndexAndValues() 
            // method to print 
            PrintIndexAndValues(myArr); 
  
            // getting a last element with required 
            // condition using method FindLast() 
            string value = Array.FindLast(myArr,  
                   element => element.StartsWith("S", 
                          StringComparison.Ordinal)); 
  
            // Display the value of 
            // the found element. 
            Console.Write("Last occurrence: "); 
  
            // printing the string 
            // following the condition 
            Console.Write("{0}", value); 
        } 
          
        catch (ArgumentNullException e) { 
  
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
  
    // Defining the method 
    // PrintIndexAndValues 
    public static void PrintIndexAndValues(String[] myArr) 
    { 
        for (int i = 0; i < myArr.Length; i++) { 
  
            Console.WriteLine("{0}", myArr[i]); 
        } 
        Console.WriteLine(); 
    } 
} 

Output:

Initial Array:
Sun
Son
Tue
Thu

Last occurrence: Son

Example 2:

CSHARP

// C# program to demonstrate 
// Array.FindLast(T[], Predicate<T>) 
// Method 
using System; 
using System.Collections.Generic; 
  
public class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        try { 
  
            // Creating and initializing 
            // new Array String with null 
            String[] myArr = null; 
  
            // getting a last element with required 
            // condition using method FindLast() 
            string value = Array.FindLast(myArr, 
                element => element.StartsWith("S", 
                       StringComparison.Ordinal)); 
  
            // Display the value of 
            // the found element. 
            Console.Write("Last occurrence: "); 
  
            // printing the string 
            // following the condition 
            Console.Write("{0}", value); 
        } 
        catch (ArgumentNullException e) { 
  
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
  
    // Defining the method 
    // PrintIndexAndValues 
    public static void PrintIndexAndValues(String[] myArr) 
    { 
        for (int i = 0; i < myArr.Length; i++) { 
  
            Console.WriteLine("{0}", myArr[i]); 
        } 
        Console.WriteLine(); 
    } 
} 

Output:

Exception Thrown: System.ArgumentNullException

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.array.findlast?view=netframework-4.7.2

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C# | Array.FindLast() Method

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