C＃ Console. Writeline() function output format

https://www.cnblogs.com/jiwangbujiu/p/5747363.html

 Format items are in the following form ：
{index[,alignment][:formatString]}   
 among "index" Index placeholder , I'm sure we all know that ;
",alignment" It's obviously alignment in the literal sense , With "," For the tag ;
":formatString" Is the restriction on the output format , With ":" For the tag .

alignment: Optional , Is a signed integer , Indicates the preferred format field width .
 If “ alignment ” Value is less than the length of the format string ,“ alignment ” Will be ignored ,
 And use the length of the format string as the field width . If “ alignment ” Is a positive number ,
 The formatted data of the field is right aligned ; If “ alignment ” It's a negative number , The formatted data of the field is left aligned .
 If you need to fill in , Use blank space . If specified “ alignment ”, You need to use commas .

formatString: Consists of standard or custom format specifiers .