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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)

public int GetLowerBound(
	int dimension
)

Parameters

dimension
Type: System.Int32

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

Return Value

Type: System.Int32
The lower bound of the specified dimension in the Array.

ExceptionCondition
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.

using System;
 public class SamplesArray  {

    public static void Main()  {

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

       // Uses GetLowerBound and GetUpperBound in the for loop. 
       for ( int i = my1DIntArray.GetLowerBound(0); i <= my1DIntArray.GetUpperBound(0); i++ )
          my1DIntArray.SetValue( 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}", 0, my1DIntArray.GetLowerBound(0), my1DIntArray.GetUpperBound(0) );
       Console.WriteLine( "Values:" );
       PrintValues( my1DIntArray );
       Console.WriteLine();

       // Creates a new three-dimensional Array of type Int32.
       Array my3DIntArray = Array.CreateInstance( typeof(Int32), 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( (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.Rank; i++ )
          Console.WriteLine( "{0}\t{1}\t{2}", i, my3DIntArray.GetLowerBound(i), my3DIntArray.GetUpperBound(i) );
       Console.WriteLine( "Values:" );
       PrintValues( my3DIntArray );
    }


    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.

 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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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