Don't use double.ToString() if you don't want to lose precision

[subramaniyanvgatmoback]

@xucian

Hi devs,

So I’ve just spent 2 hours figuring this out and thought I could help other devs avoid this.
This is a general C# oddity I found (java doesn’t do this)

Don’t use double.ToString() without a specifier if you plan to then parse it back. Use the “G17” specifier whose sole purpose is to assure a roundtrip conversion without loss of precision.

More info (the “R” specifier I think is kept for historical reasons, and it shouldn’t be used either): Link

Test it:

double d = new System.Random(DateTime.Now.Millisecond).NextDouble();
string asStr = d.ToString();
Console.WriteLine(d == double.Parse(asStr)); // false

It’s more intuitive to not lose any information when you don’t use any specifier, both on converting to and from a string. Again, java doesn’t do this.
Well, gotta live with that.

Thank you so much you solution helped me a lot.