Export (0) Print
Expand All

Array::CreateInstance Method (Type, array<Int32>)

Creates a multidimensional Array of the specified Type and dimension lengths, with zero-based indexing. The dimension lengths are specified in an array of 32-bit integers.

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

public:
static Array^ CreateInstance(
	Type^ elementType, 
	... array<int>^ lengths
)

Parameters

elementType
Type: System::Type

The Type of the Array to create.

lengths
Type: array<System::Int32>

An array of 32-bit integers that represent the size of each dimension of the Array to create.

Return Value

Type: System::Array
A new multidimensional Array of the specified Type with the specified length for each dimension, using zero-based indexing.

ExceptionCondition
ArgumentNullException

elementType is nullptr.

-or-

lengths is nullptr.

ArgumentException

elementType is not a valid Type.

-or-

The lengths array contains less than one element.

NotSupportedException

elementType is not supported. For example, Void is not supported.

-or-

elementType is an open generic type.

ArgumentOutOfRangeException

Any value in lengths is less than zero.

Unlike most classes, Array provides the CreateInstance method, instead of public constructors, to allow for late bound access.

The number of elements in the lengths array must equal the number of dimensions in the new Array. Each element of the lengths array must specify the length of the corresponding dimension in the new Array.

Reference-type elements are initialized to nullptr. Value-type elements are initialized to zero.

This method is an O(n) operation, where n is the product of all values in lengths.

The following code example shows how to create and initialize a multidimensional Array.

using namespace System;
void PrintValues( Array^ myArr );
void main()
{
   // Creates and initializes a multidimensional Array instance of type String. 
   array<int>^myLengthsArray = {2,3,4,5};
   Array^ my4DArray = Array::CreateInstance( String::typeid, myLengthsArray );
   for ( int i = my4DArray->GetLowerBound( 0 ); i <= my4DArray->GetUpperBound( 0 ); i++ )
      for ( int j = my4DArray->GetLowerBound( 1 ); j <= my4DArray->GetUpperBound( 1 ); j++ )
         for ( int k = my4DArray->GetLowerBound( 2 ); k <= my4DArray->GetUpperBound( 2 ); k++ )
            for ( int l = my4DArray->GetLowerBound( 3 ); l <= my4DArray->GetUpperBound( 3 ); l++ )
            {
               array<int>^myIndicesArray = {i,j,k,l};
               my4DArray->SetValue( String::Concat( Convert::ToString( i ), j, k, l ), myIndicesArray );

            }

   // Displays the values of the Array.
   Console::WriteLine(  "The four-dimensional Array instance contains the following values:" );
   PrintValues( my4DArray );
}

void PrintValues( Array^ myArr )
{
   System::Collections::IEnumerator^ myEnumerator = myArr->GetEnumerator();
   int i = 0;
   int cols = myArr->GetLength( myArr->Rank - 1 );
   while ( myEnumerator->MoveNext() )
   {
      if ( i < cols )
      {
         i++;
      }
      else
      {
         Console::WriteLine();
         i = 1;
      }

      Console::Write(  "\t{0}", myEnumerator->Current );
   }

   Console::WriteLine();
}

/*
 This code produces the following output.

 The four-dimensional Array instance contains the following values:
     0000    0001    0002    0003    0004
     0010    0011    0012    0013    0014
     0020    0021    0022    0023    0024
     0030    0031    0032    0033    0034
     0100    0101    0102    0103    0104
     0110    0111    0112    0113    0114
     0120    0121    0122    0123    0124
     0130    0131    0132    0133    0134
     0200    0201    0202    0203    0204
     0210    0211    0212    0213    0214
     0220    0221    0222    0223    0224
     0230    0231    0232    0233    0234
     1000    1001    1002    1003    1004
     1010    1011    1012    1013    1014
     1020    1021    1022    1023    1024
     1030    1031    1032    1033    1034
     1100    1101    1102    1103    1104
     1110    1111    1112    1113    1114
     1120    1121    1122    1123    1124
     1130    1131    1132    1133    1134
     1200    1201    1202    1203    1204
     1210    1211    1212    1213    1214
     1220    1221    1222    1223    1224
     1230    1231    1232    1233    1234
 */

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft