将整数转换为三位数-Convertintegernumbertothreedigit

20  

use

使用

int X = 9;

string PaddedResult = X.ToString().PadLeft (3, '0'); // results in 009

see MSDN references here and here.

请参阅这里和这里的MSDN引用。

12  

What about

是什么

var result = String.Format("{0:000}", X);
var result2 = X.ToString("000");

5  

int i = 5;
string tVal=i.ToString("000");

1  

From: https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#DFormatString

来自:https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings # DFormatString

The "D" (or decimal) format specifier converts a number to a string of decimal digits (0-9), prefixed by a minus sign if the number is negative.

“D”(或十进制)格式说明符将数字转换为十进制数字字符串(0-9)，如果数字为负数，则以减号作为前缀。

The precision specifier indicates the minimum number of digits desired in the resulting string. If required, the number is padded with zeros to its left to produce the number of digits given by the precision specifier.

精度说明符表示结果字符串中所需的最小位数。如果需要，该数字将在其左侧填充为0，以生成精确说明符给出的数字数。

Like:

如:

int value; 

value = 12345;
Console.WriteLine(value.ToString("D"));
// Displays 12345
Console.WriteLine(value.ToString("D8"));
// Displays 00012345

value = -12345;
Console.WriteLine(value.ToString("D"));
// Displays -12345
Console.WriteLine(value.ToString("D8"));
// Displays -00012345

0  

int i = 5;
string retVal = i.ToString().PadLeft(3, '0');