如何将前导零添加到新的C＃插值字符串？ [英] How do I add leading zeroes to the new C# interpolated strings?
问题描述
我正在努力解决如何在新的C＃插值字符串中填充前导零的整数字段。
根据本文 C＃6：String Interpolation ，相同的复合格式化功能可用于指定重要数字和前导零等内容。
在同一篇文章中是此页面的链接：标准数字格式字符串 [ ^ ]。根据这个页面，类似D2的东西应该使用两个数字作为整数并使用零填充。当我尝试它时，似乎什么都不做。
例如
Hi,
I am struggling to work out how to pad an integer field with leading zeroes in the new C# interpolated strings.
According to this article C#6: String Interpolation, "The same composite formatting power is there to specify things like significant figures and leading zeroes."
In this same article is a link to this page: Standard Numeric Format Strings[^]. According to this page, something like "D2" should use two digits for an integer and pad with zeroes. When I try it, it seems to do nothing.
E.g.
int x = 3;
Console.WriteLine( $"Integer padded to two places: {x:D2}." );
打印3，而不是03。
有谁知道如何这样做吗？
亲切的愿望~Patrick
PS - 从下面的讨论看，似乎我有没有100％清楚我想要实现的目标。
我知道数字总是在0 <= x <= 99的范围内。我得到0-9范围内的输入，我希望它添加一个前导零（例如4个打印04，但14个打印14）。希望这澄清了这个问题。
我尝试过：
除了上面显示的代码之外，我还尝试过##，DD和其他一些我忘记的变种。
This prints "3", not "03".
Does anyone know how to do this?
Kind wishes ~ Patrick
PS - Judging by discussion below, it seems I have not been 100% clear about what I am trying to achieve.
I know the numbers will always be in the range 0 <= x <= 99. When I get an input in the range 0-9, I want it to add one leading zero (e.g. 4 prints "04", but 14 prints "14"). Hope this clarifies the question.
What I have tried:
In addition to the code shown above, I have tried "##", "DD" and a couple of other variants that I have forgotten.
推荐答案
整数填充到两个位置：{x：D2}。）;
打印3，而不是03。
有谁知道怎么做？
< b / b
亲切的愿望~Patrick
PS - 从下面的讨论来看，似乎我没有100％清楚我想要实现的目标。
我知道数字总是在0< = x< = 99的范围内。当我得到0-9范围内的输入时，我希望它添加一个前导零（例如4个打印04，但14个打印14）。希望这澄清了这个问题。
我尝试过：
除了上面显示的代码之外，我还尝试了##，DD和其他一些我忘记的变体。
This prints "3", not "03".
Does anyone know how to do this?
Kind wishes ~ Patrick
PS - Judging by discussion below, it seems I have not been 100% clear about what I am trying to achieve.
I know the numbers will always be in the range 0 <= x <= 99. When I get an input in the range 0-9, I want it to add one leading zero (e.g. 4 prints "04", but 14 prints "14"). Hope this clarifies the question.
What I have tried:
In addition to the code shown above, I have tried "##", "DD" and a couple of other variants that I have forgotten.
不完全是C＃6，但很简单：
Not exactly C# 6, but simple:
string x = "3";
Console.WriteLine(x.PadLeft(2, '0'))
D或d在标准中的说明符中数字格式字符串不是它。它不是前导/填充，这是精确说明符：最小位数。你能看到区别么？以下是另一种解释：标准数字格式字符串 [ ^ ]。
对于前导数字或填充，您需要自定义数字格式字符串：自定义数字格式字符串 [ ^ ]。
注意第一行，说明符0，另见＃。玩一下;你会很快看到它的真正含义。
-SA
"D" or "d" in specifier found in "Standard Numeric Format Strings" is not it. It is not leading/padding, this is "Precision specifier: Minimum number of digits". Can you see the difference? Here is an additional explanation: Standard Numeric Format Strings[^].
For leading digits or padding, you need "Custom Numeric Format Strings": Custom Numeric Format Strings[^].
Pay attention for the first line, the specifier "0", see also "#". Play with it a bit; and you will quickly see what it really means.
—SA
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