本文向大家介绍C#保留小数位，可能好多人还不了解C#保留小数位，没有关系，看完本文你肯定有不少收获，希望本文能教会你更多东西。
1.简单的例子
- System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();
- provider.NumberDecimalDigits =intDecLength; //要設定的小數位數
- double strCashAmt=Convert.ToDouble(this.txtCashAmt.Text); //先把控件內的值轉成double
- this.txtCashAmt.Text = strCashAmt.ToString("N",provider); //再利用ToString函數格式化小數位數
2.C#保留小数位N位,四舍五入 .
- decimal d= decimal.Round(decimal.Parse("0.55555"),2);
3.C#保留小数位N位四舍五入
Math.Round(0.55555,2)
- Math.Round(0.55555,2)
4,C#保留小数位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.C#保留小数位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. C#保留小数位N位四舍五入
- double s=0.55555;
- result=s.ToString("#0.00");//点后面几个0就保留几位
C#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)
- {
- string rValue;
- string temp = "";
- if (task == 0)
- {
- task = 1;
- }
- double db = (hcount / task) * 100;
- if (hcount >= task)
- {
- rValue = "100%";
- }
- else
- {
- rValue = db.ToString("#0.#0") + "%";
- }
- return rValue;
- }
- string str1 = String.Format("{0:N1}",56789); //result: 56,789.0
- string str2 = String.Format("{0:N2}",56789); //result: 56,789.00
- string str3 = String.Format("{0:N3}",56789); //result: 56,789.000
- string str8 = String.Format("{0:F1}",56789); //result: 56789.0
- string str9 = String.Format("{0:F2}",56789); //result: 56789.00
- string str11 =(56789 / 100.0).ToString("#.##"); //result: 567.89
- string str12 =(56789 / 100).ToString("#.##"); //result: 567
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