Asp.net (C #) Common Function tables 1. datetime numeric type
system. datetime currenttime = new system. datetime ();
1.1 returns the current year, month, day, hour, minute, and second
currenttime = system. datetime. now;
1.2 Current year
int year = currenttime. year;
1.3 the current month
int month = currenttime. month;
1.4 the current day
int day = currenttime. day;
1.5 get current time
int time = currenttime. hour;
1.6 returns the current score
int score = currenttime. minute;
1.7 takes the current second
int second = currenttime. second;
1.8 returns the current millisecond
int millisecond = currenttime. millisecond;
(the variables can be in Chinese) 2. int32.parse (the variable) int32.parse ("constant ")
convert string type to 32-digit font
1.9 display Chinese date -- year, month, and day
string stry = currenttime. tostring ("F"); // The second is not displayed.
1.10 use the Chinese date to display _ year and month
string strym = currenttime. tostring ("Y");
1.11 use the Chinese date to display the _ monthsday
string strmd = currenttime. tostring ("M");
1.12 is the current year, month, and day, in the format of 2003-9-23
string strymd = currenttime. tostring ("D");
1.13 The current time, in the format of 14: 24
string strt = currenttime. tostring ("T"); 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 );
Similar to the left, right, and mid functions in VB.
Part of the string to be truncated. Parameter 1 is the start number of digits on the left, and parameter 2 is the number of digits to be truncated.
For example, string S1 = Str. substring );
Parameter 2 can be set to the default value, indicating that the string end is obtained from parameter 1. For example:
String A = "ABC ";
A. substring (1)
Is "BC ". 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 );
Delete a 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
For example:
String STR = "China ";
STR = Str. Replace ("country", "Central"); // Replace the Chinese character with the central character
Response. Write (STR); // The output result is "Central" Another example is: (this is very practical) String STR = "This Is A <SCRIPT> script ";
<"); // Replace the left angle brackets with <and (or <, It is estimated that after saving XML, it will be restored again)
Response. Write (STR); // display as: "This is the <SCRIPT> script"
If not replaced, <SCRIPT> is not displayed. If it is a script, it runs. If it is replaced, the script does not run. Point.
Specific implementation: Add the following code to your form submission button script:
String strsubmit = label1.text; // label1 is the Control ID for you to submit data.
Strsubmit = strsubmit. Replace ("<", "<");
Then save or output strsubmit.
This method can also be used to easily implement the UBB code. 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. 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); // search for 2 characters starting from str1 and the first character of "string" in str1 Reference (location) 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", insert it as "Chinese "; 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 ()
Deletes a specified number of characters from a specified position.
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. Indexof ()
Searches for the position of the specified character or string that appears for the first time in the string, and returns the first 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); // search for 2 characters starting from str1 and the first character of "string" in str1 |
