What is the Count property of BitArray class in C#?

The Count property of the BitArray class in C# returns the total number of elements (bits) in the BitArray. This is a read-only property that gives you the size of the BitArray, which is determined when the BitArray is created.

Syntax

Following is the syntax for accessing the Count property −

int count = bitArray.Count;

Return Value

The Count property returns an int value representing the number of bits in the BitArray.

Using Count Property with BitArray

Let us first create a BitArray and then use the Count property to get the number of elements −

Example

using System;
using System.Collections;

public class Demo {
   public static void Main() {
      BitArray arr = new BitArray(10);
      Console.WriteLine("Count: {0}", arr.Count);
   }
}

The output of the above code is −

Count: 10

Count Property with Different BitArray Sizes

Example

using System;
using System.Collections;

public class Demo {
   public static void Main() {
      BitArray arr1 = new BitArray(5);
      BitArray arr2 = new BitArray(new bool[] {true, false, true});
      BitArray arr3 = new BitArray(20);
      
      Console.WriteLine("BitArray 1 Count: {0}", arr1.Count);
      Console.WriteLine("BitArray 2 Count: {0}", arr2.Count);
      Console.WriteLine("BitArray 3 Count: {0}", arr3.Count);
   }
}

The output of the above code is −

BitArray 1 Count: 5
BitArray 2 Count: 3
BitArray 3 Count: 20

Count vs Length Property

The BitArray class has both Count and Length properties, and they return the same value −

Example

using System;
using System.Collections;

public class Demo {
   public static void Main() {
      BitArray arr = new BitArray(15);
      
      Console.WriteLine("Count: {0}", arr.Count);
      Console.WriteLine("Length: {0}", arr.Length);
      Console.WriteLine("Are they equal? {0}", arr.Count == arr.Length);
   }
}

The output of the above code is −

Count: 15
Length: 15
Are they equal? True

Conclusion

The Count property of BitArray class provides a simple way to determine the total number of bits in a BitArray. It returns the same value as the Length property and reflects the size specified during BitArray creation.