1.保留N痊四舍五入
System.Globalization.NumberFormatInfo provider =
new System.Globalization.NumberFormatInfo();
//要设定的小数位数
provider.NumberDecimalDigits =intDecLength;
//先把控件內的值转成double
double strCashAmt=Convert.ToDouble(
this.txtCashAmt.Text);
//再利用ToString函数格式化小数位数
this.txtCashAmt.Text = strCashAmt.ToString(
"N",provider);
2.保留N位,四舍五入 .
decimal d=
decimal.Round(
decimal.Parse(
"0.55555"),2);
3.保留N位四舍五入
Math.Round(0.55555,2)
4,保留N位四舍五入
double dbdata = 0.55555;
string str1 = dbdata.ToString(
"f2");
//fN 保留N位，四舍五入
5.保留N位四舍五入
string result = String.Format(
"{0:N2}", 0.55555);
//2位
string result = String.Format(
"...{0:N3}", 0.55555);
//3位
6. 保留N位四舍五入 (推荐)
double s=0.55555;
result=s.ToString(
"#0.00");
//点后面几个0就保留几位
C#下如果显示保留小数位数，及百分号的解决方法:
1、用NumberFormatInfo类来解决:
System.Globalization.NumberFormatInfo provider =
new System.Globalization.NumberFormatInfo();
provider.PercentDecimalDigits = 2;
//小数点保留几位数.
provider.PercentPositivePattern = 2;
//百分号出现在何处.
double result = (
double)1 / 3;
//一定要用double类型.
Response.Write(result.ToString(
"P", provider));
2、用toString方法:
public string getRate(double hcount, double task) 
...{