Array::Resize<T> Method

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

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public:
generic<typename T>
static void Resize(
	array<T>^% array, 
	int newSize
)

Type Parameters

T

The type of the elements of the array.

Parameters

array
Type: array<T>%

The one-dimensional, zero-based array to resize, or nullptr to create a new array with the specified size.

newSize
Type: System::Int32

The size of the new array.

ExceptionCondition
ArgumentOutOfRangeException

newSize is less than zero.

This method allocates a new array with the specified size, copies elements from the old array to the new one, and then replaces the old array with the new one. array must be a one-dimensional array.

If array is nullptr, this method creates a new array with the specified size.

If newSize is greater than the Length of the old array, a new array is allocated and all the elements are copied from the old array to the new one. If newSize is less than the Length of the old array, a new array is allocated and elements are copied from the old array to the new one until the new one is filled; the rest of the elements in the old array are ignored. If newSize is equal to the Length of the old array, this method does nothing.

This method is an O(n) operation, where n is newSize.

The Resize<T> method resizes a one-dimensional array only. The Array class does not include a method for resizing multi-dimensional arrays. To do this, you must either provide your own code or call a special-purpose method in a third-party library. The following code illustrates one possible implementation for a method that resizes an array of n dimensions.

No code example is currently available or this language may not be supported.

The following example shows how resizing affects the array.

using namespace System;
static void PrintIndexAndValues(array<String^>^myArr)
{
    for(int i = 0; i < myArr->Length; i++)
    {
       Console::WriteLine(L"   [{0}] : {1}", i, myArr[i]);
    }
    Console::WriteLine();
}

int main()
{

    // Create and initialize a new string array. 
    array<String^>^myArr = {L"The", L"quick", L"brown", L"fox",
        L"jumps", L"over", L"the", L"lazy", L"dog"};

    // Display the values of the array.
    Console::WriteLine( 
        L"The string array initially contains the following values:");
    PrintIndexAndValues(myArr);

    // Resize the array to a bigger size (five elements larger).
    Array::Resize(myArr, myArr->Length + 5);

    // Display the values of the array.
    Console::WriteLine(L"After resizing to a larger size, ");
    Console::WriteLine(L"the string array contains the following values:");
    PrintIndexAndValues(myArr);

    // Resize the array to a smaller size (four elements).
    Array::Resize(myArr, 4);

    // Display the values of the array.
    Console::WriteLine(L"After resizing to a smaller size, ");
    Console::WriteLine(L"the string array contains the following values:");
    PrintIndexAndValues(myArr);
    return 1;
}

/* 
This code produces the following output.

The string array initially contains the following values:
   [0] : The
   [1] : quick
   [2] : brown
   [3] : fox
   [4] : jumps
   [5] : over
   [6] : the
   [7] : lazy
   [8] : dog

After resizing to a larger size, 
the string array contains the following values:
   [0] : The
   [1] : quick
   [2] : brown
   [3] : fox
   [4] : jumps
   [5] : over
   [6] : the
   [7] : lazy
   [8] : dog
   [9] :
   [10] :
   [11] :
   [12] :
   [13] :

After resizing to a smaller size, 
the string array contains the following values:
   [0] : The
   [1] : quick
   [2] : brown
   [3] : fox

*/

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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