How to Format a C# Double to Two Decimal Places Without Rounding?

Formatting a Double in C#: Two Decimal Places Without Rounding

When working with Double values in C#, it often becomes necessary to format them into strings. A common requirement is to display the number with a specific number of decimal places without rounding the result.

To address this issue, you can utilize the combination of Math.Truncate() and String.Format(). Here's a step-by-step explanation:

1. Truncation: The Math.Truncate() method truncates the Double value to remove trailing decimal places. The result is a Double with the specified number of decimal places, effectively truncating any fractional digits.
2. Conversion to String: The formatted Double value is converted to a string using String.Format(). By specifying the format string "{0:N2}%", you instruct the method to display the number with two decimal places and use the default number format for your current culture.

For example:

double myDoubleValue = 50.947563;
double truncatedValue = Math.Truncate(myDoubleValue * 100) / 100;
string formattedString = string.Format("{0:N2}%", truncatedValue); // 50.94%

In this example, the myDoubleValue is truncated to two decimal places using Math.Truncate() and then formatted as a percentage using String.Format().

This technique ensures that the converted string representation of the Double has the desired number of decimal places without any rounding or truncation errors.

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