Format a number to always have a sign and decimal separator [duplicate]

Answer 1

Try something like this:

double x = -12.43;
string xStr = x.ToString("+0.#####;-0.#####");

But this wouldn't help to display trailing decimal point. You can handle such situations using this method:

public static string MyToString(double x)
{
    return x == Math.Floor(x)
        ? x.ToString("+0;-0;0") + CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator
        : x.ToString("+0.####;-0.####");
}

Answer 2

The format string you want to use is

ToString("N", CultureInfo.InvariantCulture) // Displays -12,445.68

See here for additional options for format strings

Answer 3

You can try like this:

string myFormatedString = number.ToString("+#;-#");