C#| How to change the size of one-dimensional array - GeeksforGeeks

28 Aug, 2019
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 arrayusing 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 arrayusing 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
Akanksha_Rai
CSharp-Arrays
CSharp-method
C#
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