C# 将 int 1、10、100 格式化为字符串“001”、“010”、“100”的掩码
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Mask to format int 1, 10, 100, to string "001", "010", "100"
提问by Jo?o Paulo Navarro
How do I apply a mask to a string aiming to format the output text in the following fashion (at most 2 leading zeros):
如何将掩码应用于旨在以以下方式格式化输出文本的字符串（最多 2 个前导零）：
int a = 1, b = 10, c = 100;
string aF = LeadingZeroFormat(a), bF = LeadingZeroFormat(b), cF = LeadingZeroFormat(c);
Console.Writeline("{0}, {1}, {2}", aF, bF, cF); // "001, 010, 100"
What is the most elegant solution?
什么是最优雅的解决方案？
Thanks in advance.
提前致谢。
采纳答案by Reed Copsey
You can use Int32.ToString("000") to format an integer in this manner. For details, see Custom Numeric Format Stringsand Int32.ToString:
您可以使用 Int32.ToString("000") 以这种方式格式化整数。有关详细信息，请参阅自定义数字格式字符串和Int32.ToString：
string one = a.ToString("000"); // 001
string two = b.ToString("000"); // 010
回答by Jon Skeet
As well as Reed's suggestion, you can do it directly in your compound format string:
除了 Reed 的建议，您还可以直接在复合格式字符串中执行此操作：
int a = 1, b = 10, c = 100;
Console.WriteLine("{0:000}, {1:000}, {2:000}", a, b, c); // "001, 010, 100"
回答by Habib
To display the integer as a decimal value, call its ToString(String) method, and pass the string "Dn" as the value of the format parameter, where n represents the minimum length of the string.
要将整数显示为十进制值，请调用其 ToString(String) 方法，并将字符串“Dn”作为格式参数的值传递，其中 n 表示字符串的最小长度。
int i = 10;
Console.WriteLine(i.ToString("D3"));
Also check How to: Pad a Number with Leading Zeros
另请检查如何：用前导零填充数字
