我目前正在为客户网站建立一个销售模块。到目前为止，我已经得到销售价格计算完美，但我遇到的问题是格式化输出到2位小数。
我目前在一个变量中调用它，以便我可以将结果数据绑定到一个列表视图。
Sale = float.Parse(((x.Sale_Price - (x.Sale_Price * (x.Discount_Price / 100))).ToString())),
谁能告诉我如何格式化输出到小数点后2位??很多谢谢!
当前回答
string outString= number.ToString("####0.00");
其他回答
这适用于你想要使用插值字符串的情况。实际上，我发布这个是因为我厌倦了反复试验，最终每次我需要格式化某个标量时都要翻阅大量的文档。
$"{1234.5678:0.00}" "1234.57" 2 decimal places, notice that value is rounded
$"{1234.5678,10:0.00}" " 1234.57" right-aligned
$"{1234.5678,-10:0.00}" "1234.57 " left-aligned
$"{1234.5678:0.#####}" "1234.5678" 5 optional digits after the decimal point
$"{1234.5678:0.00000}" "1234.56780" 5 forced digits AFTER the decimal point, notice the trailing zero
$"{1234.5678:00000.00}" "01234.57" 5 forced digits BEFORE the decimal point, notice the leading zero
$"{1234.5612:0}" "1235" as integer, notice that value is rounded
$"{1234.5678:F2}" "1234.57" standard fixed-point
$"{1234.5678:F5}" "1234.56780" 5 digits after the decimal point, notice the trailing zero
$"{1234.5678:g2}" "1.2e+03" standard general with 2 meaningful digits, notice "e"
$"{1234.5678:G2}" "1.2E+03" standard general with 2 meaningful digits, notice "E"
$"{1234.5678:G3}" "1.23E+03" standard general with 3 meaningful digits
$"{1234.5678:G5}" "1234.6" standard general with 5 meaningful digits
$"{1234.5678:e2}" "1.23e+003" standard exponential with 2 digits after the decimal point, notice "e"
$"{1234.5678:E3}" "1.235E+003" standard exponential with 3 digits after the decimal point, notice "E"
$"{1234.5678:N2}" "1,234.57" standard numeric, notice the comma
$"{1234.5678:C2}" "$1,234.57" standard currency, notice the dollar sign
$"{1234.5678:P2}" "123,456.78 %" standard percent, notice that value is multiplied by 100
$"{1234.5678:2}" "2" :)
性能警告
插值字符串很慢。根据我的经验，顺序是(快到慢):
value.ToString(format)+" blah blah" 字符串。格式("{0:Format} blah blah"， value) $"{value:format} blah blah"
我相信:
String.Format("{0:0.00}",Sale);
应该这么做。
看到链接 字符串格式示例c#
您需要做的第一件事是使用十进制类型而不是浮点类型来计算价格。使用浮点数是绝对不可接受的，因为它不能准确地表示大多数小数。
一旦你这样做了，Decimal.Round()可以用来四舍五入到2位。
string outString= number.ToString("####0.00");
private float LimitDecimalPlace(double number,int limitPlace)
{
float result = 0;
string sNumber = number.ToString();
int decimalIndex = sNumber.IndexOf(".");
if (decimalIndex != -1)
{
sNumber = sNumber.Remove(decimalIndex + limitPlace + 1);
}
result = float.Parse(sNumber);
return result;
}
