How to Truncate a Double to Two Decimal Places in a Culture-Sensitive String in C#?

Formatting a Double to a String with Precise Decimal Precision in C#

When converting a Double to a String representation, it's essential to control the number of decimal places to avoid rounding. In C#, we can achieve this without compromising culture-sensitivity.

Specific Problem:

How do we format a Double to a String with only two decimal places, truncating any remaining digits without rounding?

Solution:

To truncate the decimal value without rounding, we utilize the following steps:

1. Truncation: Multiply the Double by 100, truncate the result using Math.Truncate, then divide by 100. This effectively removes any digits beyond the hundredths place.
2. Culture-Sensitive Formatting: Use the "N2" format specifier for the string.Format method to apply the default number format for the current culture, ensuring culture-sensitive formatting.

Example Implementation:

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

Explanation:

Using this method, the result will be "50.94%", where the value has been truncated to two decimal places without any rounding. The "N2" format specifier ensures the number is formatted according to the culture's number format settings, handling thousands separators, decimal separators, and any other culture-specific formatting conventions.

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