C# Array Resize

Description

Array Resizechanges the number of elements of a one-dimensional array to the specified new size.

Syntax

Array.Resize has the following syntax.


public static void Resize<T>(
  ref T[] array,
  int newSize
)

Parameters

Array.Resize has the following parameters.

T - The type of the elements of the array.
array - The one-dimensional, zero-based array to resize, or null to create a new array with the specified size.
newSize - The size of the new array.

Returns

Array.Resize method returns

Example

The following code illustrates one possible implementation for a method that resizes an array of n dimensions.


using System;//from  w w w  . j  a  v  a2s  . c o m

public class Example
{
   public static void Main()
   {
      int[,] arr = new int[10,2];
      // Make a 2-D array larger in the first dimension.
      arr = (int[,]) ResizeArray(arr, new int[] { 12, 2} );
      // Make a 2-D array smaller in the first dimension.
      arr = (int[,]) ResizeArray(arr, new int[] { 2, 2} );
   }

   private static Array ResizeArray(Array arr, int[] newSizes)
   {
      if (newSizes.Length != arr.Rank)
         throw new ArgumentException("Not Equals", "newSizes"); 

      var temp = Array.CreateInstance(arr.GetType().GetElementType(), newSizes);
      int length = arr.Length <= temp.Length ? arr.Length : temp.Length;
      Array.ConstrainedCopy(arr, 0, temp, 0, length);
      return temp;
   }   
}

The code above generates the following result.