两个尾随和前导零字符串格式

Question

什么是产生这种

>  5 to 00000500 
>  10 to 00001000 
>  15 to 00001500 
>  20 to 00002000 

由于需要的ToString格式。

Answer 1

如果你想用一个ToString格式字符串这样做纯粹，而不是涉及乘过，那么你可以使用这样的事情：

string yourString = yourNumber.ToString("000000'00'"); 

Answer 2

尝试做

(yourNum * 100).ToString("0000000"); 

Answer 3

(number * 100).ToString("D8"); 

Answer 4

你可以用自定义格式提供程序来完成。假设输入是一个字符串。它很容易改变为任何数据类型。只需将if (arg.GetType() == typeof(String))更改为您要格式化的任何内容即可。

用法：

  var five = "5"; 
      var ten = "10"; 
      var fiveteen = "15"; 
      var twenty = "20"; 

     var formatprovider = new CustomStringFormatProvider(); 
     var res1 = string.Format(formatprovider, "{0}", five); 
     res1 = string.Format(formatprovider, "{0}", ten); 
     res1 = string.Format(formatprovider, "{0}", fiveteen); 
     res1 = string.Format(formatprovider, "{0}", twenty); 

而这里的格式提供

public sealed class CustomStringFormatProvider : IFormatProvider, ICustomFormatter 
{ 
    public Object GetFormat(Type formatType) 
    { 
     if (formatType == typeof(ICustomFormatter)) return this; 
     return Thread.CurrentThread.CurrentCulture.GetFormat(formatType); 
    } 
    public String Format(String format, Object arg, IFormatProvider formatProvider) 
    { 
     String s; 

     IFormattable formattable = arg as IFormattable; 

     if (formattable == null) s = arg.ToString(); 
     else s = formattable.ToString(format, formatProvider); 

     if (arg.GetType() == typeof(String)) 
      return String.Join("",Enumerable.Repeat("0", 4).ToArray()) + s + String.Join("",Enumerable.Repeat("0", 4 - s.Length).ToArray()); 
     return s; 
    } 
}