Looking to check for one's or zeros in a Bitstring

Question

Does anyone have an idea how to check for one's or zeros in a Bitstring? The below code checks for ones and zeros in a string, but I would like to add an extension bitstring that does the same thing. This way, I can use the method on the bitstring itself with out having to first evaluate the string.

Currently, I have to check before I entered the bitstring method.

            string MustBeBitsInStringOnesOrZeros = "11001";
        bool boTesting = Is1Or0(MustBeBitsInStringOnesOrZeros);
        // I would like to add an extension to check for ones and zeros
        // Example: MustBeBitsInStringOnesOrZeros.Is1Or0();
        if (boTesting == true)
        {
            Bitstring a = new Bitstring(MustBeBitsInStringOnesOrZeros);
        }
        else
        {
            string b = MustBeBitsInStringOnesOrZeros;
        }
    private static bool Is1Or0(string stringBit)
    {
        // This function check each
        // character in a string for "1"
        // or "0".
        bool results = false;
        for (int i = 0; i < stringBit.Length; i++)
        {
            var x = stringBit[i];
            if (x == '1' || x == '0')
            {
                results = true;
            }
            else
            {
                results = false;
                break;
            }
        }
        return results;
    }

=== Modified to show results of Bassie's example from a sealed class.

Bassie,

Well, what I was trying to say was that I cannot place the method in the sealed class with the keyword 'this' in the method. So I created another class but, I have to use it a different way and I wanted to use it the way you call it.

//I have to use it this way:
Bitstring OnesAndZeroCheck = new Bitstring(); // Bitstring is in a sealed class
Boolean g = OnesAndZeroCheck.IsBitstring2("1100111100011100101010101010101101010101010"); // Is in the sealed class
//but want to call it this way:
var successInput = "1101";
successInput.Is1Or0(); // true

user_4671754 · Answer

If I understand you correctly, you could define your extension method like this

public static class StringExtensions
{
    public static bool Is1Or0(this string stringBit) 
        => stringBit.All(c => c == '1' || c == '0');
}

And call with

var successInput = "1101";
successInput.Is1Or0(); // true

var failureInput = "1121"
failureInput.Is1Or0(); // false

From MSDN Enumerable.All:

Determines whether all elements of a sequence satisfy a condition.

This works because a string is actually just an IEnumerable of char - so when we call the IEnumerable.All() extension method, we check the condition against each individual char in the string

Note you will need to include using System.Linq; to your file that contains the extension method

user_13537222 · Answer

tested in video.

https://youtu.be/CgMFYctc3Ak

public static bool isBitstring(string s)
{
    foreach (char c in s)
    {
        if (!(c >= '0' && c <= '1')) {
            return false;
        }
    }

    return true;
}


    string str = "100000011100101010010101";

    if (isBitstring(str))
    {
        Console.WriteLine("is Bitstring");
    }
    else
    {
        Console.WriteLine("is not Bitstring");
    }

Looking to check for one's or zeros in a Bitstring

2 Answers