问题
Dim number = 5.678
Console.WriteLine(number.ToString("#,##0.##"))
displays 5.68. Is there any number format string without rounding it?
UPDATE: desired result is 5.67
回答1:
Console.Write(Math.Truncate(number * 100) / 100);
This should work. Read more answers here
回答2:
If you always have to truncate till 2 places, you can use:
Console.WriteLine("{0:F2}", number - 0.005);
Otherwise you can change number '0.005' as per your need.
Update: If you want to treat this as string, I don't think there is any readymade solution in C#, so you might have to do some extra work like below(You can create a helper method):
const double number = 5.678; //input number
var split = number.ToString(CultureInfo.InvariantCulture).Split('.');
Console.WriteLine(split[0] + (split.Length > 1 ? "." : "") + (split.Length > 1 ? split[1].Substring(0, split[1].Length > 1 ? 2 : split[1].Length) : ""));
Input: 5.678; Output: 5.67;
Input: 5.6325; Output: 5.63;
Input: 5.64; Output: 5.64
Input: 5.6; Output: 5.6;
input: 585.6138 output: 585.61
来源：https://stackoverflow.com/questions/33337453/net-number-tostring-without-rounding