decimal保留小数位数向上或向下取

 1 public class DecimalHelper
 2 {
 3     /// <summary>
 4     /// Decimal类型截取保留N位小数并且不进行四舍五入操作
 5     /// </summary>
 6     /// <param name="d"></param>
 7     /// <param name="n"></param>
 8     /// <returns></returns>
 9     public static decimal CutDecimalWithN(decimal d, int n)
10     {
11         string strDecimal = d.ToString();
12         int index = strDecimal.IndexOf(".");
13         if (index == -1 || strDecimal.Length < index + n + 1)
14         {
15             strDecimal = string.Format("{0:F" + n + "}", d);
16         }
17         else
18         {
19             int length = index;
20             if (n != 0)
21             {
22                 length = index + n + 1;
23             }
24             strDecimal = strDecimal.Substring(0, length);
25         }
26         return Decimal.Parse(strDecimal);
27     }
28  
29     /// <summary>
30     ///  Decimal类型截取保留N位小数向上取
31     /// </summary>
32     /// <param name="d"></param>
33     /// <param name="n"></param>
34     /// <returns></returns>
35     public static decimal Ceiling(decimal d, int n)
36     {
37         decimal t = decimal.Parse(Math.Pow(10, n).ToString());
38         d = Math.Ceiling(t * d);
39         return d / t;
40     }
41 }
decimal保留小数位数 向上或向下取

decimal保留小数位数向上或向下取
