Doing a Math.Round(x,2) on a decimal value, but need to ensure 2 numbers after decimal as its money

问题

Some values are returning 2.0 but I need it to be 2.00 as this is a money value that is displayed to the web page.

I am doing:

Math.Round(value, 2);

Is there a way to force it to 2 numbers after the decimal?

回答1:

You should be using a decimal to store monetary values.

But regardless of whether you are using a decimal or floating point type, your question asks how the number can be displayed with two decimal places. Use money.ToString("0.00") to display two decimal places.

回答2:

If your using VB.Net use

FormatNumber(number, digitsAfter)

or

FormatCurrency(number, digitsAfter)

or this can be in both (C# and Vb.Net)

doubleNumber = -1898300.1987;
Console.WriteLine(doubleNumber.ToString("F2", CultureInfo.InvariantCulture));  
// Displays -1898300.20

See this link for the full ToString() formats: http://msdn.microsoft.com/en-us/library/dwhawy9k.aspx

回答3:

Either .ToString("0.00") as Mark suggested if you only need to display .00 or Math.Round(value * 100.0) / 100.0; if you need an actual value with cent accuracy.

来源：https://stackoverflow.com/questions/2375735/doing-a-math-roundx-2-on-a-decimal-value-but-need-to-ensure-2-numbers-after-d