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BitArray.Get Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets the value of the bit at a specific position in the BitArray.

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

Syntax

'Declaration
Public Function Get ( _
 index As Integer _
) As Boolean
public bool Get(
 int index
)

Parameters

  • index
    Type: System.Int32
    The zero-based index of the value to get.

Return Value

Type: System.Boolean
The value of the bit at position index.

Exceptions

Exception Condition
ArgumentOutOfRangeException

index is less than zero.

-or-

index is greater than or equal to the number of elements in the BitArray.

Remarks

This method is an O(1) operation.

Examples

The following code example shows how to set and get specific elements in a BitArray.

Imports System.Collections
Public Class Example
 Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
 ' Creates and initializes a BitArray.
 Dim myBA As New BitArray(5)
 ' Displays the properties and values of the BitArray.
 outputBlock.Text &= "myBA values:" & vbCrLf
 PrintIndexAndValues(outputBlock, myBA)
 ' Sets all the elements to true.
 myBA.SetAll(True)
 ' Displays the properties and values of the BitArray.
 outputBlock.Text &= String.Format("After setting all elements to true,") & vbCrLf
 PrintIndexAndValues(outputBlock, myBA)
 ' Sets the last index to false.
 myBA.Set(myBA.Count - 1, False)
 ' Displays the properties and values of the BitArray.
 outputBlock.Text &= String.Format("After setting the last element to false,") & vbCrLf
 PrintIndexAndValues(outputBlock, myBA)
 ' Gets the value of the last two elements.
 outputBlock.Text &= "The last two elements are: " & vbCrLf
 outputBlock.Text &= String.Format(" at index {0} : {1}", _
 myBA.Count - 2, myBA.Get(myBA.Count - 2)) & vbCrLf
 outputBlock.Text &= String.Format(" at index {0} : {1}", _
 myBA.Count - 1, myBA.Get(myBA.Count - 1)) & vbCrLf
 End Sub 'Main
 Public Shared Sub PrintIndexAndValues(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal myCol As IEnumerable)
 Dim i As Integer
 Dim obj As Object
 i = 0
 For Each obj In myCol
 outputBlock.Text &= String.Format(" [{0}]: {1}", i, obj) & vbCrLf
 i = i + 1
 Next obj
 outputBlock.Text &= vbCrLf
 End Sub 'PrintValues
End Class
' This code produces the following output.
' 
' myBA values:
' [0]: False
' [1]: False
' [2]: False
' [3]: False
' [4]: False
' 
' After setting all elements to true,
' [0]: True
' [1]: True
' [2]: True
' [3]: True
' [4]: True
' 
' After setting the last element to false,
' [0]: True
' [1]: True
' [2]: True
' [3]: True
' [4]: False
' 
' The last two elements are:
' at index 3 : True
' at index 4 : False
using System;
using System.Collections;
public class Example
{
 public static void Demo(System.Windows.Controls.TextBlock outputBlock)
 {
 // Creates and initializes a BitArray.
 BitArray myBA = new BitArray(5);
 // Displays the properties and values of the BitArray.
 outputBlock.Text += "myBA values:" + "\n";
 PrintIndexAndValues(outputBlock, myBA);
 // Sets all the elements to true.
 myBA.SetAll(true);
 // Displays the properties and values of the BitArray.
 outputBlock.Text += String.Format("After setting all elements to true,") + "\n";
 PrintIndexAndValues(outputBlock, myBA);
 // Sets the last index to false.
 myBA.Set(myBA.Count - 1, false);
 // Displays the properties and values of the BitArray.
 outputBlock.Text += String.Format("After setting the last element to false,") + "\n";
 PrintIndexAndValues(outputBlock, myBA);
 // Gets the value of the last two elements.
 outputBlock.Text += "The last two elements are: " + "\n";
 outputBlock.Text += String.Format(" at index {0} : {1}", myBA.Count - 2, myBA.Get(myBA.Count - 2)) + "\n";
 outputBlock.Text += String.Format(" at index {0} : {1}", myBA.Count - 1, myBA.Get(myBA.Count - 1)) + "\n";
 }
 public static void PrintIndexAndValues(System.Windows.Controls.TextBlock outputBlock, IEnumerable myCol)
 {
 int i = 0;
 foreach (Object obj in myCol)
 {
 outputBlock.Text += String.Format(" [{0}]: {1}", i++, obj) + "\n";
 }
 outputBlock.Text += "\n";
 }
}
/* 
This code produces the following output.
myBA values:
 [0]: False
 [1]: False
 [2]: False
 [3]: False
 [4]: False
After setting all elements to true,
 [0]: True
 [1]: True
 [2]: True
 [3]: True
 [4]: True
After setting the last element to false,
 [0]: True
 [1]: True
 [2]: True
 [3]: True
 [4]: False
The last two elements are:
 at index 3 : True
 at index 4 : False
*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.


  • Last updated on 2011年11月17日