C# | Copying BitArray elements to an Array

Last Updated : 01 Feb, 2019

The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.CopyTo(Array, Int32) method is used to copy the entire BitArray to a compatible one-dimensional Array, starting at the specified index of the target array. Properties:

The BitArray class is a collection class in which the capacity is always the same as the count.
Elements are added to a BitArray by increasing the Length property.
Elements are deleted by decreasing the Length property.
Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.

Syntax:

public void CopyTo (Array arr, int index);

Parameters:

arr: It is the one-dimensional array which is the destination of the elements copied from BitArray. The Array must have zero-based indexing.
index: It is the zero-based index in array at which copying begins.

Exceptions:

ArgumentNullException : If the arr is null.
ArgumentOutOfRangeException : If the index is less than zero.
ArgumentException : If the arr is multidimensional OR the number of elements in the source BitArray is greater than the available space from index to the end of the destination array.
InvalidCastException : If type of the source BitArray cannot be cast automatically to the type of the destination array.

Below given are some examples to understand the implementation in a better way: Example 1:

CSHARP

// C# code to copy BitArray to Array,
// starting at the specified index
// of the target array
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr = new BitArray(4);

        myBitArr[0] = true;
        myBitArr[1] = true;
        myBitArr[2] = true;
        myBitArr[3] = true;

        // Creating a bool array
        bool[] myBoolArr = new bool[8];

        myBoolArr[0] = false;
        myBoolArr[1] = false;

        // Copying BitArray to Array,
        // starting at the specified index
        // of the target array
        myBitArr.CopyTo(myBoolArr, 3);

        // Displaying elements in myBoolArr
        foreach(Object obj in myBoolArr)
        {
            Console.WriteLine(obj);
        }
    }
}

Output:

False
False
False
True
True
True
True
False

Example 2:

CSHARP

// C# code to copy BitArray to Array,
// starting at the specified index
// of the target array
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr = new BitArray(3);

        myBitArr[0] = true;
        myBitArr[1] = true;
        myBitArr[2] = true;

        // Creating a bool array
        bool[] myBoolArr = new bool[8];

        myBoolArr[0] = false;
        myBoolArr[1] = false;
        myBoolArr[2] = false;

        // Copying BitArray to Array,
        // starting at the specified index
        // of the target array
        // This should raise "ArgumentOutOfRangeException"
        // as index is less than 0
        myBitArr.CopyTo(myBoolArr, -2);

        // Displaying elements in myBoolArr
        foreach(Object obj in myBoolArr)
        {
            Console.WriteLine(obj);
        }
    }
}

Runtime Error:

Unhandled Exception: System.ArgumentOutOfRangeException: Non-negative number required. Parameter name: index

Note:

The specified array must be of a compatible type. Only bool, int, and byte types of arrays are supported.
This method uses Array.Copy to copy the elements.
This method is an O(n) operation, where n is Count.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.bitarray.copyto?view=netframework-4.7.2

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