Number of elements contained in the BitArray in C#?

The Count property in C# is used to get the number of elements contained in a BitArray. This property returns an integer value representing the total number of bits in the BitArray, regardless of their values (true or false).

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 total number of elements (bits) in the BitArray.

Using Count Property with BitArray Operations

The following example demonstrates how to use the Count property with BitArray operations −

using System;
using System.Collections;

public class Demo {
    public static void Main() {
        BitArray arr1 = new BitArray(5);
        BitArray arr2 = new BitArray(5);
        arr1[0] = false;
        arr1[1] = false;
        arr2[0] = false;
        arr2[1] = true;
        
        Console.WriteLine("BitArray1 elements...");
        foreach (bool res in arr1) {
            Console.WriteLine(res);
        }
        
        Console.WriteLine("\nBitArray2 elements...");
        foreach (bool res in arr2) {
            Console.WriteLine(res);
        }
        
        Console.WriteLine("\nBitwise OR operation...");
        IEnumerable demoEnum = arr1.Or(arr2);
        foreach(Object ob in demoEnum) {
            Console.WriteLine(ob);
        }
        
        Console.WriteLine("\nNumber of elements in the resultant BitArray = " + arr1.Count);
    }
}

The output of the above code is −

BitArray1 elements...
False
False
False
False
False

BitArray2 elements...
False
True
False
False
False

Bitwise OR operation...
False
True
False
False
False

Number of elements in the resultant BitArray = 5

Using Count with CopyTo Method

The Count property is useful when copying elements from BitArray to other arrays −

using System;
using System.Collections;

public class Demo {
    public static void Main() {
        BitArray arr = new BitArray(2);
        arr[0] = false;
        arr[1] = true;
        
        Console.WriteLine("Elements in BitArray...");
        foreach (bool res in arr) {
            Console.WriteLine(res);
        }
        
        Console.WriteLine("\nNumber of elements in the BitArray = " + arr.Count);
        
        bool[] boolArr = new bool[arr.Count];
        boolArr[0] = true;
        boolArr[1] = false;
        
        arr.CopyTo(boolArr, 0);
        Console.WriteLine("\nArray after copying BitArray...");
        foreach(Object obj in boolArr) {
            Console.WriteLine(obj);
        }
    }
}

The output of the above code is −

Elements in BitArray...
False
True

Number of elements in the BitArray = 2

Array after copying BitArray...
False
True

Conclusion

The Count property provides an efficient way to determine the number of elements in a BitArray. This property is particularly useful when performing operations like copying elements to other arrays or iterating through specific ranges of the BitArray.