27 function sets that are frequently used in ASP. NET network programming

Metallica

1. datetime numeric type

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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 ")

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Convert string to 32-digit font

3. Variable. tostring ()

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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

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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)

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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 ("")

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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 );

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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 );

8. String user_ip = request. servervariables ["remote_addr"]. tostring ();

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Obtain the IP address of a remote user

9. Obtain the real IP address of the remote user through the proxy server:

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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"];

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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"];

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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 ");

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Create a new node for the XML document

13. parent node. appendchild (child node );

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Add the new child node to the XML document parent node.

14. parent node. removechild (node );

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Delete a node

 

15. Response

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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

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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

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Check whether a character is a punctuation mark.

For example: Response. Write (char. ispunctuation ('A'); // return: false

18. (INT) 'characters'

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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

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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 ()

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Clear leading and trailing Spaces

21. string variable. Replace ("substring", "Replace ")

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String replacement

For 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", for example: (this is very practical) string STR = "This Is A

22. Math. Max (I, j)

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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:

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(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 ()

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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 ()

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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 ()

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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 "1 Chinese", with a string length of 10%>

27. Remove ()

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Deletes a specified number of characters from a specified position.

String comparison is generally used: If (str1 = str2 ){}