如何舍入字符串中的两位小数？ [重复]

Possible Duplicate:
c# - How do I round a decimal value to 2 decimal places (for output on a page)

可能重复：c＃ - 如何将十进制值舍入到2个小数位（用于页面上的输出）

string strTemp = "0.51667308807373";

convert to decimal by rounding of two decimal places.

通过舍入两位小数来转换为十进制。

6 个解决方案

#1

Math.Round(Convert.ToDecimal(strTemp), 2);

#2

First convert string to decimal (Using Decimal.Parse or Decimal.TryParse).

首先将字符串转换为十进制（使用Decimal.Parse或Decimal.TryParse）。

decimal d = Decimal.Parse("123.45678");

Then round the decimal value using Round(d, m) where d is your number, m is the number of decimals, see http://msdn.microsoft.com/en-us/library/6be1edhb.aspx

然后使用Round（d，m）舍入十进制值，其中d是您的数字，m是小数位数，请参阅http://msdn.microsoft.com/en-us/library/6be1edhb.aspx

decimal rounded = Decimal.Round(d, 2);

If you only want to round for presentation, you can skip rounding to a decimal and instead simply round the value in output:

如果您只想舍入演示文稿，则可以跳过舍入到小数而不是简单地舍入输出中的值：

String.Format("{0:0.00}", 123.45678m);

#3

Convert the value to a floating point number, then round it:

将值转换为浮点数，然后将其舍入：

double temp = Double.Parse(strTemp, CultureInfo.InvariantCulture);
temp = Math.Round(temp, 2);

Alternatively, if you want the result as a string, just parse it and format it to two decimal places:

或者，如果您希望将结果作为字符串，只需解析它并将其格式化为两个小数位：

double temp = Double.Parse(strTemp, CultureInfo.InvariantCulture);
string result = temp.ToString("N2", CultureInfo.InvariantCulture);

Note: The CultureInfo object is so that the methods will always use a period as decimal separator, regardless of the local culture settings.

注意：CultureInfo对象使得方法将始终使用句点作为小数分隔符，而不管本地区域性设置如何。

#4

var roundedTemp = Math.Round(decimal.Parse(strTemp), 2);

You might want to check to ensure the string is always a decimal first but think this is the essence of it.

您可能需要检查以确保字符串始终是小数，但认为这是它的本质。

#5

you can use info from this link http://www.csharp-examples.net/string-format-double/ for the double value, use double.parse api

您可以使用此链接中的信息http://www.csharp-examples.net/string-format-double/获取double值，使用double.parse api

#6

You can use Number format Info. Something like

您可以使用数字格式信息。就像是

NumberFormatInfo nfi = new CultureInfo("en-US", false).NumberFormat;


double myInt = 0.51667308807373;

// Displays the same value with four decimal digits.
nfi.NumberDecimalDigits = 2;
Console.WriteLine(myInt.ToString("N", nfi));
Console.ReadKey();

#1

Math.Round(Convert.ToDecimal(strTemp), 2);

#2