GetLowerBound Method

Array.GetLowerBound Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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.

Version Notes

Windows Phone

 Array.GetLowerBound(System.Int32) does not throw IndexOutOfRangeException when the passed in dimension is equal to the rank of the array. Instead, it returns zero as the lower bound value.

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


using System;
public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

      // 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.
      outputBlock.Text += "One-dimensional Array:" + "\n";
      outputBlock.Text += "Rank\tLower\tUpper" + "\n";
      outputBlock.Text += String.Format("{0}\t{1}\t{2}", 0, my1DIntArray.GetLowerBound(0), my1DIntArray.GetUpperBound(0)) + "\n";
      outputBlock.Text += "Values:" + "\n";
      PrintValues(outputBlock, my1DIntArray);
      outputBlock.Text += "\n";

      // 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.
      outputBlock.Text += "Multidimensional Array:" + "\n";
      outputBlock.Text += "Rank\tLower\tUpper" + "\n";
      for (int i = 0; i < my3DIntArray.Rank; i++)
         outputBlock.Text += String.Format("{0}\t{1}\t{2}", i, my3DIntArray.GetLowerBound(i), my3DIntArray.GetUpperBound(i)) + "\n";
      outputBlock.Text += "Values:" + "\n";
      PrintValues(outputBlock, my3DIntArray);
   }


   public static void PrintValues(System.Windows.Controls.TextBlock outputBlock, 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
         {
            outputBlock.Text += "\n";
            i = 1;
         }
         outputBlock.Text += String.Format("\t{0}", myEnumerator.Current);
      }
      outputBlock.Text += "\n";
   }
}
/*
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 Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Show:
© 2017 Microsoft