C# | Converting an array of one type to an array of another type

Array.ConvertAll(TInput[], Converter<TInput, TOutput>) Method is used to convert an array of one type to an array of another type.

Syntax:

public static TOutput[] ConvertAll<TInput,TOutput> (TInput[] array, 
Converter<TInput,TOutput> converter);

Here, TInput and TOutput is the source array and target array respectively.

Parameters:

array: It is the one-dimensional, zero-based Array to convert to a target type.
converter: It is a Converter that converts each element from one type to another type.

Return Value: This method returns an array of the target type containing the converted elements from the source array.

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

Below programs illustrate the use of Array.ConvertAll(TInput[], Converter<TInput, TOutput>) Method

Example 1:

// C# program to demonstrate 
// Array.ConvertAll() Method 
using System; 
using System.Collections.Generic; 
  
public class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        try { 
  
            // Creating and initializing 
            // new the Array of int 
            int[] myArr = {10, 20, 30, 40}; 
  
            // Display the values of the myArr. 
            Console.WriteLine("Initial Array:"); 
  
            // calling the PrintIndexAndValues() 
            // method to print 
            PrintIndexAndValues(myArr); 
  
            // converting int myArr to String conarr 
            String[] conarr = Array.ConvertAll(myArr,  
              new Converter<int, String>(intToString)); 
  
            // Display the values of the myArr. 
            Console.WriteLine("Converted Array:"); 
  
            // calling the PrintIndexAndValues() 
            // method to print 
            PrintIndexAndValues(conarr); 
        } 
        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(); 
    } 
  
    // Defining the method 
    // PrintIndexAndValues 
    public static void PrintIndexAndValues(int[] myArr) 
    { 
        for (int i = 0; i < myArr.Length; i++) { 
  
            Console.WriteLine("{0}", myArr[i]); 
        } 
        Console.WriteLine(); 
    } 
  
    // Defining the method 
    // intToString 
    public static String intToString(int pf) 
    { 
        return pf.ToString(); 
    } 
} 

Output:

Initial Array:
10
20
30
40

Converted Array:
10
20
30
40

Example 2:

// C# program to demonstrate 
// Array.ConvertAll() Method 
using System; 
using System.Collections.Generic; 
  
public class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        try { 
  
            // Creating and initializing new  
            // the Array of int with null value 
            int[] myArr = null; 
  
            // converting int myArr to String conarr 
            String[] conarr = Array.ConvertAll(myArr,  
             new Converter<int, String>(intToString)); 
  
            // calling the PrintIndexAndValues() 
            // method to print 
            PrintIndexAndValues(conarr); 
        } 
        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(); 
    } 
  
    // Defining the method 
    // intToString 
    public static String intToString(int pf) 
    { 
        return pf.ToString(); 
    } 
} 

Output:

Exception Thrown: System.ArgumentNullException

Reference:

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

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