C # digit formatting

Complete format: {index [, width] [: formatstring]}

Index is in this formatProgramParameters after the referenced format string are counted from scratch. Width (optional) indicates the width of the field to be formatted. positive value indicates the right alignment of the result, and negative value indicates the left alignment of the result; formatstring (optional), which contains the format description for setting the Type format.

1. built-in letter formats

1. E-scientific notation Representation

25000. tostring ("e"); // result: 2.500000e + 004

2. C-currency representation, with a comma separator. By default, two digits are retained after the decimal point.

2.5.tostring ("C"); // result:￥2.50

3. D-decimal number

25. tostring ("D5"); // result: 00025

4. F-floating point number, reserved decimal places (rounded)

25. tostring ("F2"); // result: 25.00

5. G-regular, retain valid digits of the specified number of digits, rounding

2.52.tostring ("G2"); // result: 2.5

6. N-separated by commas (,). By default, two digits are retained after the decimal point.
2500000. tostring ("N"); // result: 2,500,000.00

7. X-hexadecimal, non-integer type will generate format exception

255. tostring ("X"); // result: FF

Ii. Custom mode output

1. "0" Description: placeholder. If possible, fill the bit

String. Format ("{0: 00}", 1234); // result: 001234

2. "#" Description: A placeholder. If possible, fill the position.

String. Format ("{0 :######}", 1234); // result: 1234

String. Format ("{0: #0 ####}", 1234); // result: 01234

String. Format ("{0: 0 #0 ####}", 1234); // result: 0001234

3. "." Description: decimal point

String. Format ("{0: 000. 000}", 1234); // result: 1234.000

String. Format ("{0: 000. 000}", 4321.12543); // result: 4321.125

4. "," Description: Numeric grouping, also used for the Multiplier

String. Format ("{0, 0}", 1234567); // result: 1,234,567

5. "%" Description: The format is percent.

String. Format ("{0: 0%}", 1234); // result: 123400%

String. Format ("{0: # %}", 1234.125); // result: 123413%

String. Format ("{0. 00%}", 1234); // result: 123400.00%

String. Format ("{0: #. 00%}", 1234.125); // result: 123412.50%

6. "ABC" Description: displays text in single quotes

String. Format ("{0: 'text' 0}", 1234); // result: Text 1234

7. "\" Description: used for transfer operator

String. Format ("\" ABC! \ ""); // Result: ABC!

8. "@" Description: followed by the string to be printed

String. Format (@ "" ABC! ""); // Result: ABC!