.Globalization.NumberFormatInfo provider = 
.Globalization.NumberFormatInfo
;
provider.NumberDecimalDigits =
DecLength; //要设定
小数位数
double strCashAmt=Convert.ToDouble(this.txtCashAmt.Text); //先把Control控件內值转成double
this.txtCashAmt.Text = strCashAmt.
("N",provider); //再利用
格式化小数位数2.保留N位, 4舍 5入 .
decimal d= decimal.Round(decimal.Parse("0.55555"),2);
3.保留N位 4舍 5入
Math.Round(0.55555,2)
4,保留N位 4舍 5入
double dbdata = 0.55555;
str1 = dbdata.("f2");//fN 保留N位
4舍 5入5.保留N位 4舍 5入
result = String.Format("{0:N2}", 0.55555);//2位
result = String.Format("{0:N3}", 0.55555);//3位6. 保留N位 4舍 5入 (不错)
double s=0.55555;
result=s.
("#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
及百分号解决思路方法:1、用NumberFormatInfo类来解决:
.Globalization.NumberFormatInfo provider = .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;//
定要用double类型.
Response.Write(result.("P", provider));
2、用toString思路方法.:
public getRate(double hcount, double task)
{
rValue;
temp = "";
(task 
0)
{
task = 1;
}
double db = (hcount / task) * 100;
(hcount >= task)
{
rValue = "100%";
}
{
rValue = db.("#0.#0") + "%";
}
rValue;
}
str1 = String.Format("{0:N1}",56789); //result: 56,789.0
str2 = String.Format("{0:N2}",56789); //result: 56,789.00
str3 = String.Format("{0:N3}",56789); //result: 56,789.000
str8 = String.Format("{0:F1}",56789); //result: 56789.0
str9 = String.Format("{0:F2}",56789); //result: 56789.00
str11 =(56789 / 100.0).("#.##"); //result: 567.89
str12 =(56789 / 100).("#.##"); //result: 567
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