Array.CreateInstance Method (Type, Int32, Int32)


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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


Type: System.Type

The Type of the Array to create.

Type: System.Int32

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

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.

Exception Condition

elementType is null.


elementType is not a valid Type.


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


elementType is an open generic type.


length1 is less than zero.


length2 is less than zero.

Unlike most classes, Array provides theCreateInstance 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 )  {
         } else  {
            i = 1;
         Console.Write( "\t{0}", myEnumerator.Current );
This code produces the following output.

The two-dimensional Array contains the following values:
    abc00    abc01    abc02
    abc10    abc11    abc12

.NET Framework
Available since 1.1
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