How to Convert a Double to a Floating-Point String Without Scientific Notation in .NET?

Conversion of double precision floating point number to floating point number string in .NET (without scientific notation)

Question:

How to convert a double precision floating point number to a floating point string representation in .NET Framework without using scientific notation? This is true even for extremely large or small numbers that fall outside the standard number format.

Solution:

A reliable and efficient method is to utilize the following format string, which preserves all significant digits even for extremely large or small double values:

doubleValue.ToString("0." + new string('#', 339))

Instructions:

This format string contains:

• 0.: Specify the decimal separator.
• #: Placeholder for valid digits.
• 339: The number of placeholders after the decimal point.

To understand why this format works, it is important to consider the range and precision of floating point numbers. The maximum number of nonzero decimal digits in a double-precision floating-point number is 15, and the exponent can shift these numbers up to 324 bits to the right. By providing a large number of placeholder numbers (339) we ensure that all significant digits are shown without rounding or scientific notation.

Advantages:

• Lossless conversion of all double values ​​regardless of their size.
• Easy to use.
• Better performance compared to regular expression or string manipulation solutions.

Tips:

For convenience, a constant format string can be created to simplify usage:

public static class FormatStrings
{
    public const string DoubleFixedPoint = "0.###################################################################################################################################################################################################################################################################################################################################################";
}

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