C# 将小数格式化为两位或整数
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Format decimal to two places or a whole number
提问by Neil
For 10 I want 10 and not 10.00 For 10.11 I want 10.11
对于 10 我想要 10 而不是 10.00 对于 10.11 我想要 10.11
Is this possible without code? i.e. by specifying a format string alone simlar to {0:N2}
这可能没有代码吗？即通过单独指定类似于 {0:N2} 的格式字符串
采纳答案by tvanfosson
decimal num = 10.11M;
Console.WriteLine( num.ToString( "0.##" ) );
回答by GeoffDev
It seems to me that the decimal precision is intrinsic to the decimal type, which defaults to 4 decimal places. If I use the following code:
在我看来，小数精度是小数类型固有的，默认为 4 位小数。如果我使用以下代码：
decimal value = 8.3475M;
Console.WriteLine(value);
decimal newValue = decimal.Round(value, 2);
Console.WriteLine(newValue);
The output is:
输出是：
8.3475
8.35
回答by Mohamed
This can be achieved using CultureInfo. Use the below using statement to import the library.
这可以使用 CultureInfo 来实现。使用以下 using 语句导入库。
using System.Globalization;
For the decimal conversion, ## can be used for optional decimal places and 00 can be used for mandetory decimal places. Check the below examples
对于十进制转换，## 可用于可选小数位，00 可用于强制小数位。检查以下示例
double d1 = 12.12;
Console.WriteLine("Double :" + d1.ToString("#,##0.##", new CultureInfo("en-US")));
String str= "12.09";
Console.WriteLine("String :" + Convert.ToDouble(str).ToString("#,##0.00", new CultureInfo("en-US")));
String str2 = "12.10";
Console.WriteLine("String2 with ## :" + Convert.ToDouble(str2).ToString("#,##0.##", new CultureInfo("en-US")));
Console.WriteLine("String2 with 00 :" + Convert.ToDouble(str2).ToString("#,##0.00", new CultureInfo("en-US")));
int integ = 2;
Console.WriteLine("Integer :" + Convert.ToDouble(integ).ToString("#,##0.00", new CultureInfo("en-US")));
the results are as follows
结果如下
Double :12.12
String :12.09
String2 with ## :12.1
String2 with 00 :12.10
Integer :2.00
