How to Convert Massive String-Formatted Integers to Hexadecimal in C#?

Convert large-scale string format integer to hexadecimal in C#

Converting large integers represented as strings to hexadecimal format can be a challenging task, especially when the integers exceed the limits of typical conversion methods.

To resolve this issue, consider the following:

var s = "843370923007003347112437570992242323";
var result = new List<byte>();
result.Add(0);
foreach (char c in s)
{
    int val = (int)(c - '0');
    for (int i = 0; i < result.Count; i++)
    {
        result[i] = (byte)((result[i] * 10 + val) % 256);
        val = (result[i] * 10 + val) / 256;
    }
    if (val != 0)
        result.Add((byte)val);
}

string hex = "";
foreach (byte b in result)
    hex = "0123456789ABCDEF"[b] + hex;

Code description:

1. Initialize input string s.
2. Create an empty list result to store intermediate calculation results.
3. Iterate over each character in the string s and convert it to an integer value.
4. For integer value of each character:
   • Multiply it by 10 and add it to the current value in result.
   • Breaks the resulting sum into single digits and stores the least significant digit in result.
   • Shift the remaining numbers right for further processing.
5. If there are any remaining numbers after the loop, add them to result.
6. Constructs a hexadecimal string result by iterating over hex and converting each byte to its hexadecimal equivalent.

Using this approach you can efficiently convert even very large string format integers to hexadecimal format in C#.

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