如果有，我如何格式化只包括小数

What is the best way to format a decimal if I only want decimal displayed if it is not an integer.

如果我只想显示小数而不是整数,那么格式化小数的最佳方法是什么。

Eg:

decimal amount = 1000M
decimal vat = 12.50M

When formatted I want:

格式化时我想:

Amount: 1000 (not 1000.0000)
Vat: 12.5 (not 12.50)

2 个解决方案

#1

    decimal one = 1000M;
    decimal two = 12.5M;

    Console.WriteLine(one.ToString("0.##"));
    Console.WriteLine(two.ToString("0.##"));

#2

Updated following comment by user1676558

由user1676558更新了以下评论

Try this:

decimal one = 1000M;    
decimal two = 12.5M;    
decimal three = 12.567M;    
Console.WriteLine(one.ToString("G"));    
Console.WriteLine(two.ToString("G"));
Console.WriteLine(three.ToString("G"));

For a decimal value, the default precision for the "G" format specifier is 29 digits, and fixed-point notation is always used when the precision is omitted, so this is the same as "0.#############################".

对于十进制值,“G”格式说明符的默认精度为29位,省略精度时始终使用定点表示法,因此这与“0。########”相同#####################”。

Unlike "0.##" it will display all significant decimal places (a decimal value can not have more than 29 decimal places).

与“0。##”不同,它将显示所有有效小数位(小数值不能超过29位小数)。

The "G29" format specifier is similar but can use scientific notation if more compact (see Standard numeric format strings).

“G29”格式说明符类似,但如果更紧凑则可以使用科学记数法(请参阅标准数字格式字符串)。

Thus:

decimal d = 0.0000000000000000000012M;
Console.WriteLine(d.ToString("G"));  // Uses fixed-point notation
Console.WriteLine(d.ToString("G29"); // Uses scientific notation

#1

    decimal one = 1000M;
    decimal two = 12.5M;

    Console.WriteLine(one.ToString("0.##"));
    Console.WriteLine(two.ToString("0.##"));

#2