Convert Hex string to Binary string, displaying all 4 bits of hex value [duplicate]

Question

I am new to C#. Please help me with below case

I am trying to convert Hex string to Binary string with 1's and 0's. I tried below method. The problem I am facing here is, if the hex value is 0, the conversion is just 0 instead of "0000". I want the binary string to contain all the 4 bits of the hex value.

const string hexDataReadFromTag= "FF001"  
foreach (char c in hexDataReadFromTag.ToCharArray())
            {
                binaryData.Append(Convert.ToString(Convert.ToInt32(c.ToString(), 16), 2));
}

output obtained is "11111111001" instead of "11111111000000000001"

Why do it character by character instead of just Convert.ToString(Convert.ToInt32(hexDataReadFromTag, 16), 2)? — juharr
– juharr, Commented Oct 26, 2016 at 16:03

Uriel · Accepted Answer · 2016-10-26 15:56:17Z

1

Use .PadLeft(4, '0') to ensure each hexadecimal digit converts to 4 binary digits (3 to 0011 and not 11):

Convert.ToString(Convert.ToInt32(c.ToString(), 16), 2).PadLeft(4, '0')

answered Oct 26, 2016 at 15:56

Uriel

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