C#| How to change the size of one-dimensional array
Array.Resize(T[], Int32) Method is used to resize the number of elements present in the array. Or in other words, this method is used to change the number of elements of a one-dimensional array to the specified new size. It resizes the only 1-D array, not multidimensional array.
Syntax:
public static void Resize<T> (ref T[] array, int newSize);
Parameters:
array: It is a one-dimensional, zero-based array to resize, or null to create a new array with the specified size.
newsize: It is the size of the new array.
Exception:If the value of nsize is less than zero, then this method will give ArgumentOutOfRangeException.
Note: This method is an O(n) operation, where n is new size.
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# program to resize the // elements of the 1-D array using System; public class GFG { // Main method static public void Main() { // create and initialize array string [] myarray = { "C#" , "Java" , "C++" , "Python" , "HTML" , "CSS" , "JavaScript" }; // Display original array before Resize Console.WriteLine( "Original Array:" ); foreach ( string i in myarray) { Console.WriteLine(i); } int len = myarray.Length; Console.WriteLine( "Length of myarray: " +len); Console.WriteLine(); // Resize the element of myarray and // create a new array. Here new array // is smaller than the original array // so, elements are copied from the // myarray to the new array until the // new one is filled. The rest of the // elements in the old array are ignored Array.Resize( ref myarray, len - 3); Console.WriteLine( "New array is less than myarray:" ); foreach ( string j in myarray) { Console.WriteLine(j); } } } |
Original Array: C# Java C++ Python HTML CSS JavaScript Length of myarray: 7 New array is less than myarray: C# Java C++ Python
Example 2:
// C# program to resize the // elements of the 1-D array using System; public class GFG { // Main method static public void Main() { // create and initialize array string [] myarray = { "C#" , "C++" , "Ruby" , "Java" , "PHP" , "Perl" }; // Display original string before Resize Console.WriteLine( "Original Array:" ); foreach ( string i in myarray) { Console.WriteLine(i); } // Length of old array int len = myarray.Length; Console.WriteLine( "Length of myarray: " +len); Console.WriteLine(); // Resize the element of myarray // and create a new array // Here new array is greater than // original array so, all the element // from myarray is copied to new array // and remaining will be null Array.Resize( ref myarray, 10); Console.WriteLine( "New array is greater than myarray:" ); foreach ( string j in myarray) { Console.WriteLine(j); } // Length of new array int len1 = myarray.Length; Console.WriteLine( "Length of New Array: " +len1); } } |
Original Array: C# C++ Ruby Java PHP Perl Length of myarray: 6 New array is greater than myarray: C# C++ Ruby Java PHP Perl Length of New Array: 10
Reference: https://docs.microsoft.com/en-us/dotnet/api/system.array.resize?view=netcore-2.1
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