.NET：十进制到圆角字符串

Question

If I have a decimal , how do I get a string version of it with two decimal places? This isn't working:

Math.Round(myDecimal, 2).ToString("{0.00}");

Answer 1

Don't use the curly brackets, they are for embedding a formatted value in a longer string using string.Format . Use this:

myDecimal.ToString("0.00");

Answer 2

Maybe i'm wrong, but i've tried myDecimal.ToString(); and it worked.

Answer 3

Assuming myDecimal is a System.Decimal , then Math.Round(myDecimal, 2).ToString(); will display two decimal digits of precision, just as you want, without any format string (unless the absolute value of your number is greater than 10^27-1). This is because the decimal datatype retains full precision of the number. That is to say that 1m , 1.0m , and 1.00m are all stored differently and will display differently.

Note that this is not true of float or double . 1f , 1.0f , and 1.00f are stored and display identically, as do 1d , 1.0d , and 1.00d .

Since the format string must be parsed at runtime, I would probably omit it for code like this in most cases.