c# Convert String to double loss of precision

Question

I have the following:

string value = "9223372036854775807";
double parsedVal = double.Parse(value, CultureInfo.InvariantCulture);

... and the result is 9.2233720368547758E+18 which is not the exact same number. How should I convert string to double without loss of precision?

Answer 1

double can only guarantee 16 (approx) decimal digits of accuracy. You might try switching to decimal (which has a few more bits to play with, and holds that value with plenty of headroom).