1. datetime numeric type
System. datetime currenttime = new system. datetime (); 1.1 take the current year, month, day, hour, minute, second currenttime = system. datetime. now; 1.2 take the current year int year = currenttime. Year; 1.3 The current month int month = currenttime. month; 1.4 Use the int day of the current day = currenttime. Day; 1.5 when the current int value is used: = currenttime. hour; 1.6 take the current minute Int = currenttime. minute; 1.7 take the current second int second = currenttime. Second; 1.8 take the current millisecond int millisecond = currenttime. millisecond; (The variable can be in Chinese) |
2. int32.parse (variable) int32.parse ("constant ")
Convert string to 32-digit font |
3. Variable. tostring ()
Convert string to string 12345. tostring ("N"); // generate 12,345.00 12345. tostring ("C"); // generate $12,345.00 12345. tostring ("e"); // generate 1.234500e + 004 12345. tostring ("F4"); // generate 12345.0000 12345. tostring ("X"); // generate 3039 (hexadecimal) 12345. tostring ("p"); // generate 1,234,500.00% |
4. Variable. Length numeric type
String Length: For example, string STR = "China "; Int Len = Str. length; // Len is a custom variable, and STR is the variable name of the string to be tested. |
5. system. Text. encoding. Default. getbytes (variable)
Convert character code to bit code For example, byte [] bytstr = system. Text. encoding. Default. getbytes (STR ); Then we can get the bit length: Len = bytstr. length; |
6. system. Text. stringbuilder ("")
String addition, (is the same as the + number ?) For example, system. Text. stringbuilder sb = new system. Text. stringbuilder (""); SB. append ("China "); SB. append ("people "); SB. append ("Republic "); |
7. Variable. substring (parameter 1, parameter 2 );
Take a part of the string. Parameter 1 is the left starting digit, and parameter 2 is the number of truncated digits. For example, string S1 = Str. substring ); |
8. String user_ip = request. servervariables ["remote_addr"]. tostring ();
Obtain the IP address of a remote user |
9. Obtain the real IP address of the remote user through the proxy server:
If (request. servervariables ["http_via"]! = NULL ){ String user_ip = request. servervariables ["http_x_forwarded_for"]. tostring (); } Else { String user_ip = request. servervariables ["remote_addr"]. tostring (); } |
10. session ["variable"];
Access session value; For example, assign a value: session ["username"] = "";Value: Object objname = session ["username"]; String strname = objname. tostring (); Clear: Session. removeall (); |
11. String STR = request. querystring ["variable"];
Use hyperlinks to send variables. For example, create a hyperlink on any page: Click On the edit. ASPX page, set the value to string STR = request. querystring ["fdid"]; |
12. Doc object. createelement ("new node name ");
Create a new node for the XML document |
13. parent node. appendchild (child node );
Add the new child node to the XML document parent node. |
14. parent node. removechild (node );
15. Response
Response. Write ("string "); Response. Write (variable ); Output to the page. Response. Redirect ("url address "); Jump to the page specified by the URL |
16. Char. iswhitespce (STRING variable, digits) -- Logical type
Check whether the specified position contains null characters; For example: String STR = "Chinese people "; Response. Write (char. iswhitespace (STR, 2); // The result is true. The first character is 0, and the second is the third character. |
17. Char. ispunctuation ('characters') -- Logical type
Check whether a character is a punctuation mark. For example: Response. Write (char. ispunctuation ('A'); // return: false |
18. (INT) 'characters'
Convert characters into numbers and queryCodePoint, note that it is single quotes. For example: Response. Write (INT) 'in'); // The code with the result of a Chinese character: 20013 |
19. (char) Code
Convert the number into characters and check the characters represented by the Code. For example: Response. Write (char) 22269); // return the word "country. |
20. Trim ()
Clear leading and trailing Spaces |
21. string variable. Replace ("substring", "Replace ")
string replacement example: string STR = "China "; STR = Str. replace ("country", "Central"); // replace the national character with the central character response. write (STR); // The output result is "Central" (this is very practical) string STR = "this is the |
22. Math. Max (I, j)
Take the maximum value in I and j. For example, int x = math. Max (5, 10); // X, the value is 10. Add a bit. 23. String comparison ...... Add one. |
23. String comparison is generally used: If (str1 = str2) {}, but there are other methods:
(1 ), String str1; str2 // Syntax: str1.endswith (str2); _ check whether str1 ends with str2 and returns a Boolean value. For example: If (str1.endswith (str2) {response. Write ("string str1 ends with" + str2 + ");} (2 ), // Syntax: str1.equals (str2); _ check whether str1 is equal to str2. Return a Boolean value, which is the same as the preceding syntax. (3 ), // Syntax equals (str1, str2); _ checks whether str1 is equal to str2 and returns a Boolean value. |
24. indexof (), lastindexof ()
Search for the position where the specified character or string appears for the first time (the last time) in the string, and return the index value, for example: Str1.indexof ("word"); // search for the index value (location) of the word in str1) Str1.indexof ("string"); // search for the index value (location) of the first character of "string" in str1) Str1.indexof ("string", 4th); // query the index value (location) of the first character of the "string" in str1 for 2 characters starting from str1 characters) |
25. insert ()
Insert the specified character into the specified index position in the string. For example: Str1.insert (1, "word"); Insert "word" to the second character of str1. If str1 = "China", it is inserted as "Chinese country "; |
26. padleft (), padright ()
Add a space or a specified char character to the left (or right) of the string so that the string reaches the specified length, for example: <% String str1 = "Chinese "; Str1 = str1.padleft (10, '1'); // No second parameter is added with Space Response. Write (str1); // The result is "1111111 Chinese" and the string length is 10. %> |
27. Remove ()
delete a specified number of characters from the specified position string comparison is generally used: if (str1 = str2) {}, but there are other methods: |