C＃| 使用String.Format（）方法将小数点前的数字四舍五入

To round the digits before the decimal point, we can use String.Format() method, here is the example.

为了将小数点前的数字四舍五入，我们可以使用String.Format()方法，这里是示例。

using System;

namespace ConsoleApplication1
{
     
    class Program
    {
     
        static void Main(string[] args)
        {
     
            //Minimum two digits before decimal point
            Console.WriteLine("Minimum Two digits before decimal point");
            Console.WriteLine(String.Format("{0:00.0}", 12512.4567));
            Console.WriteLine(String.Format("{0:00.0}", 512.4567));
            Console.WriteLine(String.Format("{0:00.0}", 2.4567)); 
            Console.WriteLine(String.Format("{0:00.0}", -2.4567));

            //Minimum three digits before decimal point
            Console.WriteLine("Minimum Three digits before decimal point");
            Console.WriteLine(String.Format("{0:000.0}", 12512.4567));
            Console.WriteLine(String.Format("{0:000.0}", 12.4567));
            Console.WriteLine(String.Format("{0:000.0}", 2.4567));
            Console.WriteLine(String.Format("{0:000.0}", -2.4567));

            Console.WriteLine();  
        }
    }
}

Output

输出量

Minimum Two digits before decimal point
12512.5
512.5
02.5
-02.5
Minimum Three digits before decimal point
12512.5
012.5
002.5
-002.5

翻译自: https://www.includehelp.com/dot-net/rounding-digits-before-decimal-point-using-string-format-method.aspx