System Namespace   Array Class

---

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

[ VB ]
<Serializable>
Overloads Public Shared Function CreateInstance ( _
   ByVal elementType As Type, _
   ByVal length1 As Integer, _
   ByVal length2 As Integer _
) As Array

[ C# ]
[Serializable]
public static Array CreateInstance (
   Type elementType,
   int length1,
   int length2
);

[ C++ ]
[Serializable]
public: static Array* CreateInstance (
   Type* elementType,
   int length1,
   int length2
);

[JScript ]
public Serializable
static function CreateInstance (
   elementType : Type,
   length1 : int,
   length2 : int
) : Array;

elementType

The Type of the Array to create.

length1

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

length2

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

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

Exception Type	Condition
ArgumentNullException	elementType is a null reference ( Nothing in Visual Basic ).
ArgumentException	elementType is not a valid 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 a null reference ( Nothing in Visual Basic ). Value-type elements are initialized to zero.

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

[ VB ] 
Imports System
Imports Microsoft.VisualBasic

Public Class SamplesArray    
    
    Public Shared Sub Main ( ) 
        
        ' Creates and initializes a two-dimensional Array of type String.
        Dim my2DArray As Array = Array.CreateInstance ( GetType ( String ) , 2, 3 ) 
        Dim i, j As Integer        
        For i = my2DArray.GetLowerBound ( 0 ) To my2DArray.GetUpperBound ( 0 ) 
            For j = my2DArray.GetLowerBound ( 1 ) To my2DArray.GetUpperBound ( 1 ) 
                my2DArray.SetValue ( "abc" + i.ToString ( ) + j.ToString ( ) , i, j ) 
            Next j 
        Next i

        ' Displays the values of the Array.
        Response.WriteLine ( "The two-dimensional Array contains the " _
           + "following values:" ) 
        PrintValues ( my2DArray ) 
    End Sub   
    
    Public Shared Sub PrintValues ( myArr As Array ) 
        Dim myEnumerator As System.Collections.IEnumerator = _
           myArr.GetEnumerator ( ) 
        Dim i As Integer = 0
        Dim cols As Integer = myArr.GetLength ( myArr.Rank - 1 ) 
        While myEnumerator.MoveNext ( ) 
            If i < cols Then
                i += 1
            Else
                Response.WriteLine ( ) 
                i = 1
            End If
            Response.Write ( ControlChars.Tab + "{0}", myEnumerator.Current ) 
        End While
        Response.WriteLine ( ) 
    End Sub
End Class

' This code produces the following output.
' 
' The two-dimensional Array contains the following values:
'     abc00    abc01    abc02
'     abc10    abc11    abc12 

[ C# ] 
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.
      Response.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  {
            Response.WriteLine ( );
            i = 1;
         }
         Response.Write ( "\t{0}", myEnumerator.Current );
      }
      Response.WriteLine ( );
   }
}
/* 
This code produces the following output.

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

[JScript ] 
import System;

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

// Displays the values of the Array.
Response.WriteLine ( "The two-dimensional Array contains the following values:" );
PrintValues ( my2DArray );
 
 
function PrintValues ( myArr : System.Array )  {
   var myEnumerator : System.Collections.IEnumerator = myArr.GetEnumerator ( );
   var i : int = 0;
   var cols : int = myArr.GetLength ( myArr.Rank - 1 );
   while ( myEnumerator.MoveNext ( ) )  {
      if ( i < cols )  {
         i++;
      } else  {
         Response.WriteLine ( );
         i = 1;
      }
      Response.Write ( "\t{0}", myEnumerator.Current );
   }
   Response.WriteLine ( );
}
 /* 
 This code produces the following output.
 
 The two-dimensional Array contains the following values:
     abc00    abc01    abc02
     abc10    abc11    abc12
 */

Array Members   Array.CreateInstance Overload List

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