C# | Array.Find() Method

Last Updated : 05 Jan, 2022

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

Syntax:

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

Here, T is the type of element of the array.

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 return the first element that matches the conditions defined by the specified predicate if it is found. Otherwise, it 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.Find(T[], Predicate) Method:

Example 1:

CSharp

   // C# program to demonstrate 
// Array.Find(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", "Mon", "Tue", "Thu"}; 
  
            // Display the values of the myArr. 
            Console.WriteLine("Initial Array:"); 
  
            // calling the PrintIndexAndValues() 
            // method to print 
            PrintIndexAndValues(myArr); 
  
            // getting a element a with required  
            // condition using method Find() 
            string value = Array.Find(myArr,  
                       element => element.StartsWith("S", 
                       StringComparison.Ordinal)); 
  
            // Display the value of  
            // the found element. 
            Console.Write("Element: "); 
  
            // 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  Mon  Tue  Thu    Element: Sun

Example 2:

CSharp

   // C# program to demonstrate 
// Array.Find(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 with the null value 
            String[] myArr = null; 
  
            // getting an element a with  
            // required condition 
            // using method Find() 
            string value = Array.Find(myArr,  
                    element => element.StartsWith("S",  
                    StringComparison.Ordinal)); 
  
            // Display the value of  
            // the found element. 
            Console.Write("Element: "); 
  
            // 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.find?view=netframework-4.7.2

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