一、C# 字符串格式化_C# 字符串格式化整理
使用方式1: xxx.ToString(xxxx)
使用方式2:string.Format(xxxx,xxx)
1、占位符格式化
零占位符:固定位数,不足补充0
数字占位符:最小化数字展示,“##”格式字符串使得值被舍入到小数点前最近的数字,其中零总被舍去。
空格占位符
string.Format("{0,-50}", theObj);//格式化成50个字符,原字符左对齐,不足则补空格
string.Format("{0,50}", theObj);//格式化成50个字符,原字符右对齐,不足则补空格
-
string.Format(
"{0:0000.00}",
12394.039) 结果为:
12394.04
-
-
string.Format(
"{0:0000.00}",
194.039) 结果为:
0194.04
-
-
string.Format(
"{0:###.##}",
12394.039) 结果为:
12394.04
-
-
string.Format(
"{0:####.#}",
194.039) 结果为:
194
自定义数值格式:
Specifier | Type | Example | Output (Passed Double 1500.42) | Note |
---|---|---|---|---|
0 | Zero placeholder | {0:00.0000} | 1500.4200 | Pads with zeroes. |
# | Digit placeholder | {0:(#).##} | (1500).42 | |
. | Decimal point | {0:0.0} | 1500.4 | |
, | Thousand separator | {0:0,0} | 1,500 | Must be between two zeroes. |
,. | Number scaling | {0:0,.} | 2 | Comma adjacent to Period scales by 1000. |
% | Percent | {0:0%} | 150042% | Multiplies by 100, adds % sign. |
e | Exponent placeholder | {0:00e+0} | 15e+2 | Many exponent formats available. |
; | Group separator see below |
百分比格式化:
-
Console.WriteLine((
0.1234).ToString(
"P0"));
//12%
-
Console.WriteLine((
0.1234).ToString(
"P"));
//12.34%
-
Console.WriteLine(
string.Format(
"{0:P2}",
0.12345));
//12.35%
2. 常用数字类型格式化:
字符串格式符号 | 说明 | 代码示例 | 输出 |
---|---|---|---|
C | 货币 | 2.5.ToString(“C”) | ¥2.50 |
D | 十进制 | 25.ToString(“D5”) | 00025 |
E | 科学计数法 | 25000.ToString(“E”) | 2.500000E+005 |
F | 固定小数点位数 | 25.ToString(“F2”) | 25.00 |
G | 常规 | 2.5.ToString(“G”) | 2.5 |
N | 数值 | 2500000.ToString(“N”) | 2,500,000.00 |
X | 十六进制 | 255.ToString(“X”) | FF |
基本数字格式说明符:
Specifier | Type | Format | Output (Passed Double 1.42) | Output (Passed Int -12400) |
---|---|---|---|---|
c | Currency | {0:c} | $1.42 | -$12,400 |
d | Decimal (Whole number) | {0:d} | System.FormatException | -12400 |
e | Scientific | {0:e} | 1.420000e+000 | -1.240000e+004 |
f | Fixed point | {0:f} | 1.42 | -12400.00 |
g | General | {0:g} | 1.42 | -12400 |
n | Number with commas for thousands | {0:n} | 1.42 | -12,400 |
r | Round trippable | {0:r} | 1.42 | System.FormatException |
x | Hexadecimal | {0:x4} | System.FormatException | cf90 |
3.时间类型格式化:
稍后见另一篇文章
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转载:https://blog.csdn.net/u011127019/article/details/110286501
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