String post-add function

String type

String:

1.Trim ()-The space of the Kinsoku, the space in the middle cannot go.

2.Toupper ()- capitalize all the letters in the string.

3.Tolower ()- turns the letter of the string all lowercase.

4.startswith ("substring");- whether to start with a substring.

5.endswith ("substring");- whether to end with a substring.

6.contains ("substring");- whether the inside contains substrings.

7.substring ( starting position , length ); If the length is omitted, The Intercept ends. Intercepts small substrings from a large string. Position starting from 0

8.indexof ("sub-string"); from the large string, locate the first occurrence of the substring. Returns an integer. Returns -1 if no substring is found in the large string .

9.lasindexof ("sub-string"); from the large string, locate the last occurrence of the substring and return an integer.

10.replacewith ("Original letter", "replacement letter"); Replace the small string specified in the large string with another substring, returning the large string after the substitution.

Date Time Type:

DateTime dt = new DateTime ( year, month, day );

DateTime dt = new DateTime ();

DateTime dt = new DateTime ( year, month, day, time, minute, second );

DateTime dt = DateTime.   Now; Get current Time

Console.Write (dt.year); get Current year

Console.Write (Dt.month); Month

Console.Write (Dt.day); Day

Console.Write (Dt.hour); when

Console.Write (Dt.minitue) points ;

Console.Write (Dt.second); seconds

Console.Write (Dt.dayofweek); Day of the week

Console.Write ((int) dt.dayofweek); Number of days of the week.

Console.Write (dt.dayofyear); the day ordinal of a year

Console.Write (dt.addxxx ( digital )); how long after that day if it's negative is how long ago

Console.WriteLine (dt.tostring ("yyyy MM month dd day hh mm points SS seconds "));

For shaping, floating-point types, there is also ToString ("formatted string") only #,0. .

Console.WriteLine (c.tostring ("#,#")); three bit a comma

Console.WriteLine (c.tostring ("#,00")); 0 means no decimals, plus 0 .

Console.WriteLine (math.ceiling (3.14)); the smallest integer greater than the current decimal

Console.WriteLine (Math.floor (3.14)); maximum decimal number less than the current decimal

Console.WriteLine (Math.Round (3.14)); Rounding

Console.WriteLine (math.sqrt ( numeric )); Find square root

String post-add function