How to Format a C# Double to a String with Two Decimal Places and No Rounding?

C# Double - ToString() Formatting with Two Decimal Places and No Rounding

Problem:

How can you format a double to a string in C# with only two decimal places, without rounding? Additionally, the conversion should be culture-sensitive.

Solution:

To achieve this, use the following steps:

1. Truncate:

   • Use Math.Truncate to eliminate decimal places beyond the desired precision.
   • Multiply the value by 100 to shift the decimal point, then truncate the result, and finally divide by 100 to restore the original scale.

2. Format:

   • Use string.Format to convert the truncated value to a string.
   • Specify the "{0:N2}" format string to display the value with two decimal places and use the default number format based on the current culture.

Example:

Consider the number 50.947563:

double x = Math.Truncate(50.947563 * 100) / 100;
// x now contains 50.94

string s = string.Format("{0:N2}%", x);
// s now contains "50.94%" without rounding

By following these steps, you can format a double with two decimal places without rounding, while maintaining culture-sensitive formatting.

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