All Courses

Recommended Courses

BitArray Collection in C#

Updated on Sep 3, 2025

46,296 Views

Table of Content

constructors in bitarray collection
properties in bitarray collection
methods in bitarray collection
bitarray operations

The BitArray collection handles a compact matrix of bit values. These bit values are represented as boolean values where true indicates 1 and false indicates 0.

Constructors in BitArray Collection

The different constructors and their description is given as follows:

Constructors	Description
BitArray (BitArray)	This constructor initializes a new instance of the BitArray class that contains the bit values copied from the specified BitArray collection.
BitArray (Boolean [])	This constructor initializes a new instance of the BitArray class that contains the bit values copied from the specified Boolean array.
BitArray (Byte [])	This constructor initializes a new instance of the BitArray class that contains the bit values copied from the specified byte array.
BitArray (Int32)	This constructor initializes a new instance of the BitArray class that can contain the specified number of bit values, initially set to false.
BitArray (Int32, Boolean)	This constructor initializes a new instance of the BitArray class that can contain the specified number of bit values, initially set to the specified value.
BitArray (Int32 [])	This constructor initializes a new instance of the BitArray class that contains the bit values copied from the specified 32-bit integer array.

Table: Constructors in BitArray in C#
Source: MSDN

Properties in BitArray Collection

The different properties and their description is given as follows:

Properties	Description
Count	This property gets the number of elements included in BitArray.
IsReadOnly	This property gets a value that indicates whether BitArray is read-only.
IsSynchronized	This property gets a value that indicates whether access to the BitArray interface is synchronized (it is thread safe).
Item [Int32]	This property gets or sets the value of the bit that is in a specific BitArray position
Length	This property gets or sets the number of BitArray elements.
SyncRoot	This property gets an object that can be used to synchronize access to BitArray.

Table: Properties in BitArray in C#
Source: MSDN

Methods in BitArray Collection

The different methods and their description is given as follows:

Methods	Description
And(Bit Array)	This method performs the AND operation bit by bit between the elements of the current BitArray object and the corresponding elements of the specified array. The current BitArray object will be modified to store the result of the bitwise AND operation
Clone()	This method creates a surface copy of the BitArray collection.
CopyTo( Array, Int32)	This method copies the entire BitArray into a compatible one-dimensional array, starting at the specified index of the target array.
Equals(Object)	This method determines whether the specified object is equal to the current object.
Get(Int32)	This method gets the value of the bit in a specific BitArray position
GetEnumerator()	This method returns an enumerator that iterates through the BitArray collection.
GetHashCode()	This method serves as the default hash function.
GetType()	This method gets the Type of the current instance.
MemberwiseClone()	This method creates a surface copy of the current Object.
Not()	This method inverts all the bit values that are in the current BitArray collection, so that the elements set in true change to false and the elements set in false change toa true.
Or(Bit Array)	This method performs the bitwise OR operation between the elements of the current BitArrayobject and the corresponding elements of the specified array. The current BitArray object will be modified to store the result of the bitwise OR operation.
Set(Int32, Boolean)	This method sets the bit located at a specific BitArray position to the specified value
SetAll (Boolean)	This method sets all BitArray bits to the specified value.
ToString()	This method returns a string that represents the current object.
Xor(Bit Array)	This method performs the exclusive OR bitwise operation between the elements of the current BitArray object against the corresponding elements of the specified array. The current BitArray object will be modified to store the result of the bitwise exclusive OR operation.

Table: Methods in BitArray in C#
Source: MSDN

BitArray Operations

Some of the BitArray operations are given as follows:

Create a BitArray

A BitArray can be created using new. Then the appropriate boolean values can be inserted into a BitArray. The program that demonstrates this is given as follows:

using System;
using System.Collections;
namespace BitArrayDemo
{
  class Example
  {
     static void Main(string[] args)
     {
       BitArray bArr = new BitArray(5);
       bArr.Set(0, true);
       bArr.Set(1, false);
       bArr.Set(2, true);
       bArr.Set(3, true);
       bArr.Set(4, false);
       for (int i = 0; i < bArr.Count; i++)
       {
           Console.Write(bArr [i]);
           Console.Write(" ");
       }
     }
  }
}

Source Code: Program to create BitArray in C#

The output of the above program is as follows:

True False True True False

AND Operation in BitArray

The And() method performs the AND operation bit by bit between the elements of the current BitArray and the corresponding elements of the BitArray that is specified. The program that demonstrates this is given as follows:

using System;
using System.Collections;
namespace BitArrayDemo
{
  class Example
  {
     static void Main(string[] args)
     {
       BitArray bArr1 = new BitArray(5);
       BitArray bArr2 = new BitArray(5);
       bArr1.Set(0, true);
       bArr1.Set(1, false);
       bArr1.Set(2, true);
       bArr1.Set(3, true);
       bArr1.Set(4, false);
       bArr2.Set(0, true);
       bArr2.Set(1, true);
       bArr2.Set(2, false);
       bArr2.Set(3, true);
       bArr2.Set(4, false);
       Console.WriteLine("BitArray 1");
       for (int i = 0; i < bArr1.Count; i++)
       {
           Console.Write(bArr1[i]);
           Console.Write(" ");
       }
       Console.WriteLine();
       Console.WriteLine("BitArray 2");
       for (int i = 0; i < bArr2.Count; i++)
       {
           Console.Write(bArr2[i]);
           Console.Write(" ");
       }
       bArr1.And(bArr2);
       Console.WriteLine();
       Console.WriteLine("BitArray after AND operation");
       for (int i = 0; i < bArr1.Count; i++)
       {
           Console.Write(bArr1[i]);
           Console.Write(" ");      
       }
     }
  }
}

Source Code: Program to demonstrate AND operation in BitArray in C#

The output of the above program is as follows:

BitArray 1
True False True True False
BitArray 2
True True False True False
BitArray after AND operation
True False False True False

OR Operation in BitArray

The Or() method performs the OR operation bit by bit between the elements of the current BitArray and the corresponding elements of the BitArray that is specified. The program that demonstrates this is given as follows:

using System;
using System.Collections;
namespace BitArrayDemo
{
  class Example
  {
     static void Main(string[] args)
     {
       BitArray barr1 = new BitArray(5);
       BitArray barr2 = new BitArray(5);
       barr1.Set(0, true);
       barr1.Set(1, false);
       barr1.Set(2, true);
       barr1.Set(3, true);
       barr1.Set(4, false);
       barr2.Set(0, true);
       barr2.Set(1, true);
       barr2.Set(2, false);
       barr2.Set(3, true);
       barr2.Set(4, false);
       Console.WriteLine("BitArray 1");
       for (int i = 0; i < barr1.Count; i++)
       {
           Console.Write(barr1[i]);
           Console.Write(" ");
       }
       Console.WriteLine();
       Console.WriteLine("BitArray 2");
       for (int i = 0; i < barr2.Count; i++)
       {
           Console.Write(barr2[i]);
           Console.Write(" ");
       }
       barr1.Or(barr2);
       Console.WriteLine();
       Console.WriteLine("BitArray after OR operation");
       for (int i = 0; i < barr1.Count; i++)
       {
           Console.Write(barr1[i]);
           Console.Write(" ");   
       }  
     }
  }
}

Source Code: Program to demonstrate OR operation in BitArray in C#

The output of the above program is as follows:

BitArray 1
True False True True False
BitArray 2
True True False True False
BitArray after OR operation
True True True True False

NOT Operation in BitArray

The Not() method inverts all the elements in the specified BitArray so the true elements are converted to false and the false elements are converted to true. The program that demonstrates this is given as follows:

using System;
using System.Collections;
namespace BitArrayDemo
{
  class Example
  {
     static void Main(string[] args)
     {
       BitArray barr = new BitArray(5);
       barr.Set(0, true);
       barr.Set(1, false);
       barr.Set(2, true);
       barr.Set(3, true);
       barr.Set(4, false);
       Console.WriteLine("BitArray");
       for (int i = 0; i < barr.Count; i++)
       {
           Console.Write(barr[i]);
           Console.Write(" ");            
       }
       barr.Not();
       Console.WriteLine();
       Console.WriteLine("BitArray after NOT operation");
       for (int i = 0; i < barr.Count; i++)
       {
           Console.Write(barr[i]);
           Console.Write(" ");
       }
     }
  }
}

Source Code: Program to demonstrate NOT operation in BitArray in C#

The output of the above program is as follows:

BitArray
True False True True False
BitArray after NOT operation
False True False False True

Check whether the BitArray is ReadOnly or not

Use the IsReadOnly property to check whether the BitArray is ReadOnly or not. If a collection is ReadOnly, then you won’t be able to add new elements to it.

Let us see an example that checks whether the BitArray is ReadOnly or not:

using System;
using System.Collections;
namespace BitArrayDemo
{
  class Example
  {
     static void Main(string[] args)
     {
       BitArray bArr = new BitArray(5);
       bArr.Set(0, true);
       bArr.Set(1, false);
       bArr.Set(2, true);
       bArr.Set(3, true);
       for (int i = 0; i < bArr.Count; i++)
       {
           Console.Write(bArr [i]);
           Console.Write(" ");
       }
       Console.WriteLine("\nIsReadOnly? " + bArr.IsReadOnly);
     }
  }
}

Source Code: Program to check whether the BitArray is ReadOnly or not in C#

The above program gives the following output:

True False True True False
IsReadOnly? False

Get the length of the elements in a BitArray

To get the length of the BitArray elements, use the Length property. Let us see an example:

using System;
using System.Collections;
public class Example  {
  public static void Main()  {
     BitArray bArr1 = new BitArray(15);
     BitArray bArr2 = new BitArray(5);
       bArr2.Set(0, true);
       bArr2.Set(1, false);
       bArr2.Set(2, true);
       bArr2.Set(3, true);
       bArr2.Set(4, false);
       for (int i = 0; i < bArr2.Count; i++)
       {
           Console.Write(bArr2 [i]);
           Console.Write(" ");
       }
     Console.WriteLine( "\nLength: {0}", bArr1.Length );
     Console.WriteLine( "Length: {0}", bArr2.Length );
  }
}

Source Code: Program to get the length of the BitArray elements in C#

The above program gives the following output:

True False True True False
Length: 15
Length: 5

Get the count of the elements in a BitArray

To get the count of the elements in BitArray, use the Count property. Let us see an example:

using System;
using System.Collections;
public class Demo  {
  public static void Main()  {
     BitArray bArr1 = new BitArray( 10 );
     BitArray bArr2 = new BitArray(5);
       bArr2.Set(0, true);
       bArr2.Set(1, false);
       bArr2.Set(2, true);
       bArr2.Set(3, true);
       bArr2.Set(4, false);
       for (int i = 0; i < bArr2.Count; i++)
       {
           Console.Write(bArr2 [i]);
           Console.Write(" ");
       }
     Console.WriteLine( "\nCount: {0}", bArr1.Count );
     Console.WriteLine( "Count: {0}", bArr2.Count );
  }
}

Source Code: Program to get the count of the elements in BitArray in C#

The above program gives the following output:

True False True True False
Count: 10
Count: 5

Fetch a value from a BitArray Collection

In a BitArray collection, you may need to fetch a value. For that, the following is the code. Here, we are displaying a value from the BitArray elements:

using System;
using System.Collections;
public class Example  {
  public static void Main()  {
     BitArray bArr1 = new BitArray(15);
     BitArray bArr2 = new BitArray(5);
       bArr2.Set(0, true);
       bArr2.Set(1, false);
       bArr2.Set(2, true);
       bArr2.Set(3, true);
       bArr2.Set(4, false);
       for (int i = 0; i < bArr2.Count; i++)
       {
           Console.Write(bArr2 [i]);
           Console.Write(" ");
       }
     Console.WriteLine( "\nLength: {0}", bArr1.Length );
     Console.WriteLine( "Length: {0}", bArr2.Length );
     bool s = bArr2[3];
     Console.WriteLine("4th element ="+s);
  }
}

Source Code: Program to fetch a value from a BitArray collection in C#

The above program generated the following output:

True False True True False
Length: 15
Length: 5
4th element =True

Full Name*

Email*

+91

Phone Number*

United States +1

India +91

Canada +1

Australia +61

Singapore +65

New Zealand +64

Germany +49

United Arab Emirates +971

Hong Kong +852

Ireland +353

Afghanistan +93

Aland Islands +358

Albania +355

Algeria +213

AmericanSamoa +1684

Andorra +376

Angola +244

Anguilla +1264

Antarctica +672

Antigua and Barbuda +1268

Argentina +54

Armenia +374

Aruba +297

Ascension Island +247

Austria +43

Azerbaijan +994

Bahamas +1242

Bahrain +973

Bangladesh +880

Barbados +1246

Belarus +375

Belgium +32

Belize +501

Benin +229

Bermuda +1441

Bhutan +975

Bolivia +591

Bosnia and Herzegovina +387

Botswana +267

Brazil +55

British Indian Ocean Territory +246

Brunei Darussalam +673

Bulgaria +359

Burkina Faso +226

Burundi +257

Cambodia +855

Cameroon +237

Cape Verde +238

Cayman Islands +1345

Central African Republic +236

Chad +235

Chile +56

China +86

Christmas Island +61

Cocos (Keeling) Islands +61

Colombia +57

Comoros +269

Congo +242

Cook Islands +682

Costa Rica +506

Cote d'Ivoire +225

Croatia +385

Cuba +53

Cyprus +357

Czech Republic +420

Democratic Republic of the Congo +243

Denmark +45

Djibouti +253

Dominica +1767

Dominican Republic +1849

Ecuador +593

Egypt +20

El Salvador +503

Equatorial Guinea +240

Eritrea +291

Estonia +372

Eswatini +268

Ethiopia +251

Falkland Islands (Malvinas) +500

Faroe Islands +298

Fiji +679

Finland +358

France +33

French Guiana +594

French Polynesia +689

Gabon +241

Gambia +220

Georgia +995

Ghana +233

Gibraltar +350

Greece +30

Greenland +299

Grenada +1473

Guadeloupe +590

Guam +1671

Guatemala +502

Guernsey +44

Guinea +224

Guinea-Bissau +245

Guyana +592

Haiti +509

Holy See (Vatican City State) +379

Honduras +504

Hungary +36

Iceland +354

Indonesia +62

Iran +98

Iraq +964

Isle of Man +44

Israel +972

Italy +39

Jamaica +1876

Japan +81

Jersey +44

Jordan +962

Kazakhstan +77

Kenya +254

Kiribati +686

Korea, Democratic People's Republic of Korea +850

Korea, Republic of South Korea +82

Kosovo +383

Kyrgyzstan +996

Laos +856

Latvia +371

Lebanon +961

Lesotho +266

Liberia +231

Libya +218

Liechtenstein +423

Lithuania +370

Luxembourg +352

Macau +853

Madagascar +261

Malawi +265

Malaysia +60

Maldives +960

Mali +223

Malta +356

Marshall Islands +692

Martinique +596

Mauritania +222

Mauritius +230

Mayotte +262

Mexico +52

Micronesia, Federated States of Micronesia +691

Moldova +373

Monaco +377

Mongolia +976

Montenegro +382

Montserrat +1664

Morocco +212

Mozambique +258

Myanmar +95

Namibia +264

Nauru +674

Nepal +977

Netherlands +31

New Caledonia +687

Nicaragua +505

Niger +227

Nigeria +234

Niue +683

Norfolk Island +672

North Macedonia +389

Northern Mariana Islands +1670

Norway +47

Oman +968

Pakistan +92

Palau +680

Palestine +970

Papua New Guinea +675

Paraguay +595

Peru +51

Philippines +63

Pitcairn +872

Poland +48

Portugal +351

Puerto Rico +1939

Qatar +974

Reunion +262

Romania +40

Russia +7

Rwanda +250

Saint Barthelemy +590

Saint Helena, Ascension and Tristan Da Cunha +290

Saint Kitts and Nevis +1869

Saint Lucia +1758

Saint Martin +590

Saint Pierre and Miquelon +508

Saint Vincent and the Grenadines +1784

Samoa +685

San Marino +378

Sao Tome and Principe +239

Saudi Arabia +966

Senegal +221

Serbia +381

Seychelles +248

Sierra Leone +232

Sint Maarten +1721

Slovakia +421

Slovenia +386

Solomon Islands +677

Somalia +252

South Africa +27

South Georgia and the South Sandwich Islands +500

South Sudan +211

Spain +34

Sri Lanka +94

Sudan +249

Suriname +597

Svalbard and Jan Mayen +47

Sweden +46

Switzerland +41

Syrian Arab Republic +963

Taiwan +886

Tajikistan +992

Tanzania, United Republic of Tanzania +255

Thailand +66

Timor-Leste +670

Togo +228

Tokelau +690

Tonga +676

Trinidad and Tobago +1868

Tunisia +216

Turkey +90

Turkmenistan +993

Turks and Caicos Islands +1649

Tuvalu +688

Uganda +256

Ukraine +380

United Kingdom +44

Uruguay +598

Uzbekistan +998

Vanuatu +678

Venezuela, Bolivarian Republic of Venezuela +58

Vietnam +84

Virgin Islands, British +1284

Virgin Islands, U.S. +1340

Wallis and Futuna +681

Yemen +967

Zambia +260

Zimbabwe +263

By Signing up, you agree to ourTerms & Conditionsand ourPrivacy and Policy

10% OFF

Coupon Code "SMART10"

Coupon Expires 07/09

Copy

Get your free handbook for CSM!!