C# | Converting an array of one type to an array of another type
Last Updated :
01 Feb, 2019
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Array.ConvertAll(TInput[], Converter<TInput, TOutput>) Method is used to convert an array of one type to an array of another type.
Syntax:
CSHARP
CSHARP
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:
Example 2:
Initial Array: 10 20 30 40 Converted Array: 10 20 30 40
// 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:
Reference:
Exception Thrown: System.ArgumentNullException
