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 }
