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Array.GetLowerBound Method

Gets the lower bound of the specified dimension in the Array.

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

'Declaration
Public Function GetLowerBound ( _
	dimension As Integer _
) As Integer
'Usage
Dim instance As Array
Dim dimension As Integer
Dim returnValue As Integer

returnValue = instance.GetLowerBound(dimension)
public int GetLowerBound (
	int dimension
)
public function GetLowerBound (
	dimension : int
) : int

Parameters

dimension

A zero-based dimension of the Array whose lower bound needs to be determined.

Return Value

The lower bound of the specified dimension in the Array.

Exception typeCondition

IndexOutOfRangeException

dimension is less than zero.

-or-

dimension is equal to or greater than Rank.

GetLowerBound(0) returns the lower bound for the indexes of the first dimension of the Array, and GetLowerBound(Rank - 1) returns the lower bound of the last dimension of the Array.

This method is an O(1) operation.

The following code example uses GetLowerBound and GetUpperBound to initialize a one-dimensional array and a multidimensional array.

Imports System
Imports Microsoft.VisualBasic

Public Class SamplesArray    
    
    Public Shared Sub Main()
        
        ' Creates a new one-dimensional Array of type Int32.
        Dim my1DIntArray As Array = Array.CreateInstance(GetType(Int32), 5)
        
        ' Uses GetLowerBound and GetUpperBound in the for loop.
        Dim i As Integer
        For i = my1DIntArray.GetLowerBound(0) To my1DIntArray.GetUpperBound(0)
            my1DIntArray.SetValue(i + 1, i)
        Next i 
        ' Displays the bounds and values of the one-dimensional Array.
        Console.WriteLine("One-dimensional Array:")
        Console.WriteLine("Rank" + ControlChars.Tab + "Lower" _
           + ControlChars.Tab + "Upper")
        Console.WriteLine("{0}" + ControlChars.Tab + "{1}" _
           + ControlChars.Tab + "{2}", 0, my1DIntArray.GetLowerBound(0), _
           my1DIntArray.GetUpperBound(0))
        Console.WriteLine("Values:")
        PrintValues(my1DIntArray)
        Console.WriteLine()
        
        ' Creates a new three-dimensional Array of type Int32.
        Dim my3DIntArray As Array = _
           Array.CreateInstance(GetType(Int32), 2, 3, 4)
        
        ' Uses GetLowerBound and GetUpperBound in the for loop.
        Dim j, k As Integer
        For i = my3DIntArray.GetLowerBound(0) _
        To my3DIntArray.GetUpperBound(0)
            For j = my3DIntArray.GetLowerBound(1) _
            To my3DIntArray.GetUpperBound(1)
                For k = my3DIntArray.GetLowerBound(2) _
                To my3DIntArray.GetUpperBound(2)
                    my3DIntArray.SetValue(i * 100 + j * 10 + k, i, j, k)
                Next k
            Next j 
        Next i

        ' Displays the bounds and values of the multidimensional Array.
        Console.WriteLine("Multidimensional Array:")
        Console.WriteLine("Rank" + ControlChars.Tab + "Lower" _
           + ControlChars.Tab + "Upper")
        For i = 0 To my3DIntArray.Rank - 1
            Console.WriteLine("{0}" + ControlChars.Tab + "{1}" _
               + ControlChars.Tab + "{2}", i, my3DIntArray.GetLowerBound(i), _
               my3DIntArray.GetUpperBound(i))
        Next i
        Console.WriteLine("Values:")
        PrintValues(my3DIntArray)
    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
                Console.WriteLine()
                i = 1
            End If
            Console.Write(ControlChars.Tab + "{0}", myEnumerator.Current)
        End While
        Console.WriteLine()
    End Sub
End Class

' This code produces the following output.
' 
' One-dimensional Array:
' Rank    Lower    Upper
' 0    0    4
' Values:
'     1    2    3    4    5
' 
' Multidimensional Array:
' Rank    Lower    Upper
' 0    0    1
' 1    0    2
' 2    0    3
' Values:
'     0    1    2    3
'     10    11    12    13
'     20    21    22    23
'     100    101    102    103
'     110    111    112    113
'     120    121    122    123

import System.*;

public class SamplesArray
{
    public static void main(String[] args)
    {
        // Creates a new one-dimensional Array of type Int32.
        Array my1DIntArray = Array.CreateInstance(Int32.class.ToType(), 5);
        // Uses GetLowerBound and GetUpperBound in the for loop.
        for (int i = my1DIntArray.GetLowerBound(0); i <= my1DIntArray.
            GetUpperBound(0); i++) {
            my1DIntArray.SetValue((Int32)(i + 1), i);
        }
        // Displays the bounds and values of the one-dimensional Array.
        Console.WriteLine("One-dimensional Array:");
        Console.WriteLine("Rank\tLower\tUpper");
        Console.WriteLine("{0}\t{1}\t{2}", (Int32)0, (Int32)my1DIntArray.
            GetLowerBound(0), (Int32)my1DIntArray.GetUpperBound(0));
        Console.WriteLine("Values:");
        PrintValues(my1DIntArray);
        Console.WriteLine();
        // Creates a new three-dimensional Array of type Int32.
        Array my3DIntArray = Array.CreateInstance(Int32.class.ToType(), 2, 3, 4);
        // Uses GetLowerBound and GetUpperBound in the for loop.
        for (int i = my3DIntArray.GetLowerBound(0); i <= my3DIntArray.
            GetUpperBound(0); i++) {
            for (int j = my3DIntArray.GetLowerBound(1); j <= my3DIntArray.
                GetUpperBound(1); j++) {
                for (int k = my3DIntArray.GetLowerBound(2); k <= my3DIntArray.
                    GetUpperBound(2); k++) {
                    my3DIntArray.SetValue((Int32)(i * 100 + j * 10 + k), i, j, k);
                }
            }
        }  // Displays the bounds and values of the multidimensional Array.
        Console.WriteLine("Multidimensional Array:");
        Console.WriteLine("Rank\tLower\tUpper");
        for (int i = 0; i < my3DIntArray.get_Rank(); i++) {
            Console.WriteLine("{0}\t{1}\t{2}", (Int32)i, (Int32)my3DIntArray.
                GetLowerBound(i), (Int32)my3DIntArray.GetUpperBound(i));
        }
        Console.WriteLine("Values:");
        PrintValues(my3DIntArray);
    } //main

    public static void PrintValues(Array myArr)
    {
        System.Collections.IEnumerator myEnumerator = myArr.GetEnumerator();
        int i = 0;
        int cols = myArr.GetLength(myArr.get_Rank() - 1);
        while (myEnumerator.MoveNext()) {
            if (i < cols) {
                i++;
            }
            else {
                Console.WriteLine();
                i = 1;
            }
            Console.Write("\t{0}", myEnumerator.get_Current());
        }
        Console.WriteLine();
    } //PrintValues
} //SamplesArray

/*
 This code produces the following output.
 
 One-dimensional Array:
 Rank    Lower    Upper
 0    0    4
 Values:
     1    2    3    4    5
 
 Multidimensional Array:
 Rank    Lower    Upper
 0    0    1
 1    0    2
 2    0    3
 Values:
     0    1    2    3
     10    11    12    13
     20    21    22    23
     100    101    102    103
     110    111    112    113
     120    121    122    123
*/

import System;

// Creates a new one-dimensional Array of type Int32.
var my1DIntArray : System.Array = System.Array.CreateInstance( Int32, 5 );

// Uses GetLowerBound and GetUpperBound in the for loop.
for ( var m : int = my1DIntArray.GetLowerBound(0); m <= my1DIntArray.GetUpperBound(0); m++ )
  my1DIntArray.SetValue( Int32(m+1), m );

// Displays the bounds and values of the one-dimensional Array.
Console.WriteLine( "One-dimensional Array:" );
Console.WriteLine( "Rank\tLower\tUpper" );
Console.WriteLine( "{0}\t{1}\t{2}", 0, my1DIntArray.GetLowerBound(0), my1DIntArray.GetUpperBound(0) );
Console.WriteLine( "Values:" );
PrintValues( my1DIntArray );
Console.WriteLine();

// Creates a new three-dimensional Array of type Int32.
var my3DIntArray : System.Array = System.Array.CreateInstance( Int32, 2, 3, 4 );

// Uses GetLowerBound and GetUpperBound in the for loop.
for ( var i : int = my3DIntArray.GetLowerBound(0); i <= my3DIntArray.GetUpperBound(0); i++ )
  for ( var j : int = my3DIntArray.GetLowerBound(1); j <= my3DIntArray.GetUpperBound(1); j++ )
     for ( var k : int = my3DIntArray.GetLowerBound(2); k <= my3DIntArray.GetUpperBound(2); k++ )  {
        my3DIntArray.SetValue( Int32((i*100)+(j*10)+k), i, j, k );
     }

// Displays the bounds and values of the multidimensional Array.
Console.WriteLine( "Multidimensional Array:" );
Console.WriteLine( "Rank\tLower\tUpper" );
for ( var l : int = 0; l < my3DIntArray.Rank; l++ )
  Console.WriteLine( "{0}\t{1}\t{2}", l, my3DIntArray.GetLowerBound(l), my3DIntArray.GetUpperBound(l) );
Console.WriteLine( "Values:" );
PrintValues( my3DIntArray );
 
 
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  {
         Console.WriteLine();
         i = 1;
      }
      Console.Write( "\t{0}", myEnumerator.Current );
   }
   Console.WriteLine();
}
 /*
 This code produces the following output.
 
 One-dimensional Array:
 Rank    Lower    Upper
 0    0    4
 Values:
     1    2    3    4    5
 
 Multidimensional Array:
 Rank    Lower    Upper
 0    0    1
 1    0    2
 2    0    3
 Values:
     0    1    2    3
     10    11    12    13
     20    21    22    23
     100    101    102    103
     110    111    112    113
     120    121    122    123
*/ 

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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