C# Double - ToString() formatting with two decimal places but no rounding

c# string double
kjv picture kjv · Mar 16, 2010 · Viewed 413.7k times · Source

How do I format a Double to a String in C# so as to have only two decimal places?

If I use String.Format("{0:0.00}%", myDoubleValue) the number is then rounded and I want a simple truncate without any rounding. I also want the conversion to String to be culture sensitive.

Answer

Kyle Rosendo picture Kyle Rosendo · Mar 16, 2010

I use the following:

double x = Math.Truncate(myDoubleValue * 100) / 100;

For instance:

If the number is 50.947563 and you use the following, the following will happen:

- Math.Truncate(50.947563 * 100) / 100;
- Math.Truncate(5094.7563) / 100;
- 5094 / 100
- 50.94

And there's your answer truncated, now to format the string simply do the following:

string s = string.Format("{0:N2}%", x); // No fear of rounding and takes the default number format

Related questions

Converting string to double in C#

I have a long string with double-type values separated by # -value1#value2#value3# etc I splitted it to string table. Then, I want to convert every single element from this table to double type and I get an error. What …

Read More
How do I parse a string with a decimal point to a double?

I want to parse a string like "3.5" to a double. However, double.Parse("3.5") yields 35 and double.Parse("3.5", System.Globalization.NumberStyles.AllowDecimalPoint) throws a FormatException. Now my computer's locale is set to German, wherein a comma is used as decimal separator. …

Read More
Converting double to string with N decimals, dot as decimal separator, and no thousand separator

I need to convert a decimal to a string with N decimals (two or four) and NO thousand separator: 'XXXXXXX (dot) DDDDD' The problem with CultureInfo.InvariantCulture is that is places ',' to separate thousands. UPDATE This should work …

Read More