2024年4月7日发(作者：)

C# 指定字符串宽度和对齐方式

("{0,-10}",str);//这个表示第一个参数str字符串的宽度为10，左对齐

("{0,10}",str);//这个表示第一个参数str字符串的宽度为10，右对齐

参考：From MSDN

Format Item Syntax

Each format item takes the following form and consists of the following

components:

{index[,alignment][:formatString]}

The matching braces ("{" and "}") are required.

Index Component

The mandatory index component, also called a parameter specifier, is a number

starting from 0 that identifies a corresponding item in the list of objects. That is,

the format item whose parameter specifier is 0 formats the first object in the list,

the format item whose parameter specifier is 1 formats the second object in the

list, and so on.

Multiple format items can refer to the same element in the list of objects by

specifying the same parameter specifier. For example, you can format the same

numeric value in hexadecimal, scientific, and number format by specifying a

composite format string like this: "{0:X} {0:E} {0:N}".

Each format item can refer to any object in the list. For example, if there are

three objects, you can format the second, first, and third object by specifying a

composite format string like this: "{1} {0} {2}". An object that is not

referenced by a format item is ignored. A runtime exception results if a

parameter specifier designates an item outside the bounds of the list of objects.

Alignment Component

The optional alignment component is a signed integer indicating the preferred

formatted field width. If the value of alignment is less than the length of the

formatted string, alignment is ignored and the length of the formatted string is

used as the field width. The formatted data in the field is right-aligned

ifalignment is positive and left-aligned if alignment is negative. If padding is

necessary, white space is used. The comma is required if alignment is specified.

Format String Component

The optional formatString component is a format string that is appropriate for

the type of object being formatted. Specify a if the corresponding object is a

numeric value, a if the corresponding object is a object, or an if the

corrersponding object is an enumeration value. If formatString is not specified,

the general ("G") format specifier for a numeric, date and time, or enumeration

type is used. The colon is required if formatString is specified.