C#中设定小数位数

 

System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo(); 

02 provider.NumberDecimalDigits =intDecLength; //要设定的小数位数 

03 double strCashAmt=Convert.ToDouble(this.txtCashAmt.Text); //先把控件內的值转成double 

04   

05 this.txtCashAmt.Text = strCashAmt.ToString("N",provider); //再利用ToString函数格式化小数位数 

06   

07    

08 //2.保留N位,四舍五入 . 

09   

10 decimal d= decimal.Round(decimal.Parse("0.55555"),2); 

11   

12    

13 //3.保留N位四舍五入 

14   

15 Math.Round(0.55555,2) 

16   

17    

18 //4,保留N位四舍五入 

19 double dbdata = 0.55555; 

20 string str1 = dbdata.ToString("f2");//fN 保留N位，四舍五入 

21   

22    

23 //5.保留N位四舍五入 

24   

25 string result = String.Format("{0:N2}", 0.55555);//2位 

26   

27 string result = String.Format("{0:N3}", 0.55555);//3位 

28   

29    

30 //6. 保留N位四舍五入 (不错) 

31   

32 double s=0.55555; 

33 result=s.ToString("#0.00");//点后面几个0就保留几位 

34   

35    

36 //C#下如果显示保留小数位数，及百分号的解决方法: 

37   

38 //1、用NumberFormatInfo类来解决: 

39 System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo(); 

40   

41 provider.PercentDecimalDigits = 2;//小数点保留几位数. 

42 provider.PercentPositivePattern = 2;//百分号出现在何处. 

43 double result = (double)1 / 3;//一定要用double类型. 

44 Response.Write(result.ToString("P", provider)); 

45   

46 //2、用toString方法.: 

47 public string getRate(double hcount, double task) 

48 { 

49 string rValue; 

50 string temp = ""; 

51   

52 if (task == 0) 

53 { 

54 task = 1; 

55 } 

56   

57 double db = (hcount / task) * 100; 

58   

59 if (hcount >= task) 

60 { 

61 rValue = "100%"; 

62 } 

63 else

64 { 

65 rValue = db.ToString("#0.#0") + "%"; 

66 } 

67 return rValue; 

68 } 

69   

70 string str1 = String.Format("{0:N1}",56789); //result: 56,789.0 

71 string str2 = String.Format("{0:N2}",56789); //result: 56,789.00 

72 string str3 = String.Format("{0:N3}",56789); //result: 56,789.000 

73 string str8 = String.Format("{0:F1}",56789); //result: 56789.0 

74 string str9 = String.Format("{0:F2}",56789); //result: 56789.00 

75 string str11 =(56789 / 100.0).ToString("#.##"); //result: 567.89 

76 string str12 =(56789 / 100).ToString("#.##"); //result: 567