为了将小数点后的数字四舍五入，我们可以使用String.Format()方法，这是示例。
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
//只有两个小数点
Console.WriteLine("Two digits after decimal point");
Console.WriteLine(String.Format("{0:0.00}", 512.4246));
Console.WriteLine(String.Format("{0:0.00}", 512.4));
Console.WriteLine(String.Format("{0:0.00}", 512.0));
Console.WriteLine("\n\nThree digits after decimal point");
Console.WriteLine(String.Format("{0:0.000}", 512.4246));
Console.WriteLine(String.Format("{0:0.000}", 512.4));
Console.WriteLine(String.Format("{0:0.000}", 512.0));
Console.WriteLine();
}
}
}输出结果
Two digits after decimal point 512.42 512.40 512.00 Three digits after decimal point 512.425 512.400 512.000