总结C#保留小数位数
2013-11-21 20:08
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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
[csharp]
view plaincopyprint?
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 .
[csharp]
view plaincopyprint?
decimal d= decimal.Round(decimal.Parse("0.55555"),2);
3.C#保留小数位N位四舍五入
[csharp]
view plaincopyprint?
Math.Round(0.55555,2)
4,C#保留小数位N位四舍五入
[csharp]
view plaincopyprint?
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
[csharp]
view plaincopyprint?
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
[csharp]
view plaincopyprint?
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:
[csharp]
view plaincopyprint?
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.:
[csharp]
view plaincopyprint?
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
补充SQL 四舍五入 保留小数位
保留两位小数
CAST(324.345123 AS DECIMAL(18,2))
CAST(324.346123 AS NUMERIC(18,2))
值为:324.35(默认进行了四舍五入)
四舍五入
round(324.345123,2)
值为:324.350000
1.简单的例子
[csharp]
view plaincopyprint?
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
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 .
[csharp]
view plaincopyprint?
decimal d= decimal.Round(decimal.Parse("0.55555"),2);
decimal d= decimal.Round(decimal.Parse("0.55555"),2);
3.C#保留小数位N位四舍五入
[csharp]
view plaincopyprint?
Math.Round(0.55555,2)
Math.Round(0.55555,2)
4,C#保留小数位N位四舍五入
[csharp]
view plaincopyprint?
double dbdata = 0.55555;
string str1 = dbdata.ToString("f2");//fN 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.C#保留小数位N位四舍五入
[csharp]
view plaincopyprint?
string result = String.Format("{0:N2}", 0.55555);//2位
string result = String.Format("{0:N3}", 0.55555);//3位
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
[csharp]
view plaincopyprint?
double s=0.55555;
result=s.ToString("#0.00");//点后面几个0就保留几位
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:
[csharp]
view plaincopyprint?
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));
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.:
[csharp]
view plaincopyprint?
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
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
补充SQL 四舍五入 保留小数位
保留两位小数
CAST(324.345123 AS DECIMAL(18,2))
CAST(324.346123 AS NUMERIC(18,2))
值为:324.35(默认进行了四舍五入)
四舍五入
round(324.345123,2)
值为:324.350000
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