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Array::CreateInstance Method (Type^, Int32)

 

Creates a one-dimensional Array of the specified Type and length, with zero-based indexing.

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

public:
static Array^ CreateInstance(
	Type^ elementType,
	int length
)

Parameters

elementType
Type: System::Type^

The Type of the Array to create.

length
Type: System::Int32

The size of the Array to create.

Return Value

Type: System::Array^

A new one-dimensional Array of the specified Type with the specified length, using zero-based indexing.

Exception Condition
ArgumentNullException

elementType is null.

ArgumentException

elementType is not a valid Type.

NotSupportedException

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

-or-

elementType is an open generic type.

ArgumentOutOfRangeException

length is less than zero.

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

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

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

The following code example shows how to create and initialize a one-dimensional Array.

using namespace System;
void PrintValues( Array^ myArr );
void main()
{
   // Creates and initializes a one-dimensional Array instance of type Int32.
   Array^ my1DArray = Array::CreateInstance( Int32::typeid, 5 );
   for ( int i = my1DArray->GetLowerBound( 0 ); i <= my1DArray->GetUpperBound( 0 ); i++ )
      my1DArray->SetValue( i + 1, i );

   // Displays the values of the Array.
   Console::WriteLine(  "The one-dimensional Array instance contains the following values:" );
   PrintValues( my1DArray );
}

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 one-dimensional Array instance contains the following values:
     1    2    3    4    5
 */

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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