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Array.CreateInstance Method (Type, Int32, Int32)

Creates a two-dimensional Array of the specified Type and dimension lengths, with zero-based indexing.

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

public static Array CreateInstance(
	Type elementType,
	int length1,
	int length2
)

Parameters

elementType
Type: System.Type

The Type of the Array to create.

length1
Type: System.Int32

The size of the first dimension of the Array to create.

length2
Type: System.Int32

The size of the second dimension of the Array to create.

Return Value

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

ExceptionCondition
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

length1 is less than zero.

-or-

length2 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 the product of length1 and length2.

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

using System;
public class SamplesArray  {

   public static void Main()  {

      // Creates and initializes a two-dimensional Array of type String.
      Array my2DArray=Array.CreateInstance( typeof(String), 2, 3 );
      for ( int i = my2DArray.GetLowerBound(0); i <= my2DArray.GetUpperBound(0); i++ )
         for ( int j = my2DArray.GetLowerBound(1); j <= my2DArray.GetUpperBound(1); j++ )
            my2DArray.SetValue( "abc" + i + j, i, j );

      // Displays the values of the Array.
      Console.WriteLine( "The two-dimensional Array contains the following values:" );
      PrintValues( my2DArray );
   }


   public static 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 two-dimensional Array contains the following values:
    abc00    abc01    abc02
    abc10    abc11    abc12
*/

.NET Framework

Supported in: 4.6, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.

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