Array.CreateInstance Method (Type, Int32, Int32, Int32)


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Creates a three-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,
	int length3


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.

Type: System.Int32

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

Return Value

Type: System.Array

A new three-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.


length3 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, length2, and length3.

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

using System;
public class SamplesArray  {

   public static void Main()  {

      // Creates and initializes a three-dimensional Array of type Object.
      Array my3DArray=Array.CreateInstance( typeof(Object), 2, 3, 4 );
      for ( int i = my3DArray.GetLowerBound(0); i <= my3DArray.GetUpperBound(0); i++ )
         for ( int j = my3DArray.GetLowerBound(1); j <= my3DArray.GetUpperBound(1); j++ )
            for ( int k = my3DArray.GetLowerBound(2); k <= my3DArray.GetUpperBound(2); k++ )
               my3DArray.SetValue( "abc" + i + j + k, i, j, k );

      // Displays the values of the Array.
      Console.WriteLine( "The three-dimensional Array contains the following values:" );
      PrintValues( my3DArray );

   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 three-dimensional Array contains the following values:
    abc000    abc001    abc002    abc003
    abc010    abc011    abc012    abc013
    abc020    abc021    abc022    abc023
    abc100    abc101    abc102    abc103
    abc110    abc111    abc112    abc113
    abc120    abc121    abc122    abc123

.NET Framework
Available since 1.1
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