Manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on (1) and false indicates the bit is off (0).
(in mscorlib.dll)
Visual Basic (Declaration)
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class BitArray _
Implements ICollection, IEnumerable, ICloneable
[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class BitArray : ICollection,
IEnumerable, ICloneable
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class BitArray sealed : ICollection,
IEnumerable, ICloneable
public final class BitArray implements ICollection, IEnumerable, ICloneable
The size of a BitArray is controlled by the client; indexing past the end of the BitArray throws an ArgumentException.
Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.
The following code example shows how to create and initialize a BitArray and how to print out its values.
Imports System
Imports System.Collections
Public Class SamplesBitArray
Public Shared Sub Main()
' Creates and initializes several BitArrays.
Dim myBA1 As New BitArray(5)
Dim myBA2 As New BitArray(5, False)
Dim myBytes() As Byte = {1, 2, 3, 4, 5}
Dim myBA3 As New BitArray(myBytes)
Dim myBools() As Boolean = {True, False, True, True, False}
Dim myBA4 As New BitArray(myBools)
Dim myInts() As Integer = {6, 7, 8, 9, 10}
Dim myBA5 As New BitArray(myInts)
' Displays the properties and values of the BitArrays.
Console.WriteLine("myBA1")
Console.WriteLine(" Count: {0}", myBA1.Count)
Console.WriteLine(" Length: {0}", myBA1.Length)
Console.WriteLine(" Values:")
PrintValues(myBA1, 8)
Console.WriteLine("myBA2")
Console.WriteLine(" Count: {0}", myBA2.Count)
Console.WriteLine(" Length: {0}", myBA2.Length)
Console.WriteLine(" Values:")
PrintValues(myBA2, 8)
Console.WriteLine("myBA3")
Console.WriteLine(" Count: {0}", myBA3.Count)
Console.WriteLine(" Length: {0}", myBA3.Length)
Console.WriteLine(" Values:")
PrintValues(myBA3, 8)
Console.WriteLine("myBA4")
Console.WriteLine(" Count: {0}", myBA4.Count)
Console.WriteLine(" Length: {0}", myBA4.Length)
Console.WriteLine(" Values:")
PrintValues(myBA4, 8)
Console.WriteLine("myBA5")
Console.WriteLine(" Count: {0}", myBA5.Count)
Console.WriteLine(" Length: {0}", myBA5.Length)
Console.WriteLine(" Values:")
PrintValues(myBA5, 8)
End Sub 'Main
Public Shared Sub PrintValues(myList As IEnumerable, myWidth As Integer)
Dim i As Integer = myWidth
Dim obj As [Object]
For Each obj In myList
If i <= 0 Then
i = myWidth
Console.WriteLine()
End If
i -= 1
Console.Write("{0,8}", obj)
Next obj
Console.WriteLine()
End Sub 'PrintValues
End Class 'SamplesBitArray
' This code produces the following output.
'
' myBA1
' Count: 5
' Length: 5
' Values:
' False False False False False
' myBA2
' Count: 5
' Length: 5
' Values:
' False False False False False
' myBA3
' Count: 40
' Length: 40
' Values:
' True False False False False False False False
' False True False False False False False False
' True True False False False False False False
' False False True False False False False False
' True False True False False False False False
' myBA4
' Count: 5
' Length: 5
' Values:
' True False True True False
' myBA5
' Count: 160
' Length: 160
' Values:
' False True True False False False False False
' False False False False False False False False
' False False False False False False False False
' False False False False False False False False
' True True True False False False False False
' False False False False False False False False
' False False False False False False False False
' False False False False False False False False
' False False False True False False False False
' False False False False False False False False
' False False False False False False False False
' False False False False False False False False
' True False False True False False False False
' False False False False False False False False
' False False False False False False False False
' False False False False False False False False
' False True False True False False False False
' False False False False False False False False
' False False False False False False False False
' False False False False False False False False
using System;
using System.Collections;
public class SamplesBitArray {
public static void Main() {
// Creates and initializes several BitArrays.
BitArray myBA1 = new BitArray( 5 );
BitArray myBA2 = new BitArray( 5, false );
byte[] myBytes = new byte[5] { 1, 2, 3, 4, 5 };
BitArray myBA3 = new BitArray( myBytes );
bool[] myBools = new bool[5] { true, false, true, true, false };
BitArray myBA4 = new BitArray( myBools );
int[] myInts = new int[5] { 6, 7, 8, 9, 10 };
BitArray myBA5 = new BitArray( myInts );
// Displays the properties and values of the BitArrays.
Console.WriteLine( "myBA1" );
Console.WriteLine( " Count: {0}", myBA1.Count );
Console.WriteLine( " Length: {0}", myBA1.Length );
Console.WriteLine( " Values:" );
PrintValues( myBA1, 8 );
Console.WriteLine( "myBA2" );
Console.WriteLine( " Count: {0}", myBA2.Count );
Console.WriteLine( " Length: {0}", myBA2.Length );
Console.WriteLine( " Values:" );
PrintValues( myBA2, 8 );
Console.WriteLine( "myBA3" );
Console.WriteLine( " Count: {0}", myBA3.Count );
Console.WriteLine( " Length: {0}", myBA3.Length );
Console.WriteLine( " Values:" );
PrintValues( myBA3, 8 );
Console.WriteLine( "myBA4" );
Console.WriteLine( " Count: {0}", myBA4.Count );
Console.WriteLine( " Length: {0}", myBA4.Length );
Console.WriteLine( " Values:" );
PrintValues( myBA4, 8 );
Console.WriteLine( "myBA5" );
Console.WriteLine( " Count: {0}", myBA5.Count );
Console.WriteLine( " Length: {0}", myBA5.Length );
Console.WriteLine( " Values:" );
PrintValues( myBA5, 8 );
}
public static void PrintValues( IEnumerable myList, int myWidth ) {
int i = myWidth;
foreach ( Object obj in myList ) {
if ( i <= 0 ) {
i = myWidth;
Console.WriteLine();
}
i--;
Console.Write( "{0,8}", obj );
}
Console.WriteLine();
}
}
/*
This code produces the following output.
myBA1
Count: 5
Length: 5
Values:
False False False False False
myBA2
Count: 5
Length: 5
Values:
False False False False False
myBA3
Count: 40
Length: 40
Values:
True False False False False False False False
False True False False False False False False
True True False False False False False False
False False True False False False False False
True False True False False False False False
myBA4
Count: 5
Length: 5
Values:
True False True True False
myBA5
Count: 160
Length: 160
Values:
False True True False False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
True True True False False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
False False False True False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
True False False True False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
False True False True False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
*/
using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList, int myWidth );
int main()
{
// Creates and initializes several BitArrays.
BitArray^ myBA1 = gcnew BitArray( 5 );
BitArray^ myBA2 = gcnew BitArray( 5,false );
array<Byte>^myBytes = {1,2,3,4,5};
BitArray^ myBA3 = gcnew BitArray( myBytes );
array<Boolean>^myBools = {true,false,true,true,false};
BitArray^ myBA4 = gcnew BitArray( myBools );
array<Int32>^myInts = {6,7,8,9,10};
BitArray^ myBA5 = gcnew BitArray( myInts );
// Displays the properties and values of the BitArrays.
Console::WriteLine( "myBA1" );
Console::WriteLine( " Count: {0}", myBA1->Count );
Console::WriteLine( " Length: {0}", myBA1->Length );
Console::WriteLine( " Values:" );
PrintValues( myBA1, 8 );
Console::WriteLine( "myBA2" );
Console::WriteLine( " Count: {0}", myBA2->Count );
Console::WriteLine( " Length: {0}", myBA2->Length );
Console::WriteLine( " Values:" );
PrintValues( myBA2, 8 );
Console::WriteLine( "myBA3" );
Console::WriteLine( " Count: {0}", myBA3->Count );
Console::WriteLine( " Length: {0}", myBA3->Length );
Console::WriteLine( " Values:" );
PrintValues( myBA3, 8 );
Console::WriteLine( "myBA4" );
Console::WriteLine( " Count: {0}", myBA4->Count );
Console::WriteLine( " Length: {0}", myBA4->Length );
Console::WriteLine( " Values:" );
PrintValues( myBA4, 8 );
Console::WriteLine( "myBA5" );
Console::WriteLine( " Count: {0}", myBA5->Count );
Console::WriteLine( " Length: {0}", myBA5->Length );
Console::WriteLine( " Values:" );
PrintValues( myBA5, 8 );
}
void PrintValues( IEnumerable^ myList, int myWidth )
{
int i = myWidth;
IEnumerator^ myEnum = myList->GetEnumerator();
while ( myEnum->MoveNext() )
{
Object^ obj = safe_cast<Object^>(myEnum->Current);
if ( i <= 0 )
{
i = myWidth;
Console::WriteLine();
}
i--;
Console::Write( "{0,8}", obj );
}
Console::WriteLine();
}
/*
This code produces the following output.
myBA1
Count: 5
Length: 5
Values:
False False False False False
myBA2
Count: 5
Length: 5
Values:
False False False False False
myBA3
Count: 40
Length: 40
Values:
True False False False False False False False
False True False False False False False False
True True False False False False False False
False False True False False False False False
True False True False False False False False
myBA4
Count: 5
Length: 5
Values:
True False True True False
myBA5
Count: 160
Length: 160
Values:
False True True False False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
True True True False False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
False False False True False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
True False False True False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
False True False True False False False False
False False False False False False False False
False False False False False False False False
False False False False False False False False
*/
System..::.Object
System.Collections..::.BitArray
Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
This implementation does not provide a synchronized (thread safe) wrapper for a BitArray.
Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.
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
Reference