C # Common functions and methods set Rollup

1, DateTime Digital type

System.DateTime currenttime=new System.DateTime ();

1.1 Minutes and seconds of the current month and day

Currenttime=system.datetime.now;

1.2 Take the year before

int year =currenttime.year;

1.3 Take Current month

int month =currenttime.month;

1.4 Take the current day

int day =currenttime.day;

1.5 Take current time

int when =currenttime.hour;

1.6 Taking current points

int sub-=currenttime.minute;

1.7 Take current seconds

int seconds =currenttime.second;

1.8 Take the current millisecond

int milliseconds =currenttime.millisecond;
(Variable available in Chinese)

1.9 Chinese date display--month and day

String Stry=currenttime.tostring ("F"); Do not display seconds

1.10 Chinese Date Display _ Month

String strym=currenttime.tostring ("Y");

1.11 Chinese Date Display _ Month Day

String strmd=currenttime.tostring ("M");

1.12 The current month date, in the format: 2003-9-23

String strymd=currenttime.tostring ("D");

1.13 Take the current time, in the format: 14:24

String strt=currenttime.tostring ("T");

2. Convert the character type to 32-bit digital type

Int32.Parse (variable) int32.parse ("constant")

3, variables. ToString ()

Character conversion to string
12345.ToString ("n"); Generate 12,345.00
12345.ToString ("C"); Generate ￥12,345.00
12345.ToString ("E"); Build 1.234500e+004
12345.ToString ("F4"); Build 12345.0000
12345.ToString ("X"); Build 3039 (16 binary)
12345.ToString ("P"); Generate 1,234,500.00%

4, variables. Length Digital Type

Fetch string Length:

such as: string str= "China";

int Len = str. Length; Len is a custom variable, and STR is the variable name of the string to be measured.

5, Loadline conversion to bit code

System.Text.Encoding.Default.GetBytes (variable)

such as: byte[] bytstr = System.Text.Encoding.Default.GetBytes (str);

The bit length can then be obtained:

len = bytstr.length;

6, System.Text.StringBuilder ("")

The string is added, (is the + number the same?) ）

Such as:

System.Text.StringBuilder sb = new System.Text.StringBuilder ("");
Sb. Append ("Zhonghua");
Sb. Append ("The People");
Sb. Append ("Republic");

7, variables. Substring (parameter 1, parameter 2);

Intercept a part of the string, parameter 1 is the left start number, parameter 2 is to intercept several.

such as: string S1 = str. Substring (0,2);

8, take the remote User IP address

String user_ip=request.servervariables["REMOTE_ADDR"]. ToString ();

9, through the proxy server to take the remote user real IP address:

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. Access Session Value

session["variable"];

For example, assign a value:

session["username"]= "little Bush";

Value:

Object objname=session["username"];
String strname=objname.tostring ();

Empty:

Session.removeall ();

11. Transfer variables with hyperlinks

String str=request.querystring["variable"];

If you are building a hyperlink on any page: Click

Value in edit.aspx page: String str=request.querystring["Fdid"];

12. Create a new XML document node

Doc object. createelement ("New node name");

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

Parent node. AppendChild (sub-node);

14. Deleting nodes

Parent node. RemoveChild (node);

15, to the page output: Response

Response.Write ("string");
Response.Write (variable);

Jump to the page specified by the URL:

Response.Redirect ("URL address");

16. Check whether the specified position is null character

Char. ISWHITESPCE (string variable, number of digits)--logic type;
　　
Such as:

String Str= "the Chinese People";
Response.Write (Char. Iswhitespace (str,2)); The result is: True, the first character is 0 bits, and 2 is the third character.

17, check whether the character is punctuation

Char. Ispunctuation (' character ')--Logic type

Such as:

Response.Write (Char. Ispunctuation (' A ')); return: False

18, the character into a number, check the code point, note is a single quotation mark.

(int) ' character '

Such as:

Response.Write ((int) ' Medium '); Code with result for Chinese characters: 20013

19. Convert the number to character, check the character represented by code: (char) code

Such as:

Response.Write ((char) 22269); Returns the word "country".

20, clear the string before and after the space: Trim ()

21. String substitution

String variable. Replace ("sub-string", "Replace with")

Such as:

String str= "China";
Str=str. Replace ("Country", "central"); Change the word of the country to the central word
Response.Write (str); The output is "central"

Another example: (This is very practical)

String Str= "This is the

If not replaced,

The value of this code is that you can invalidate all the HTML tags in a text, show them all, and protect your interactive site.

Specific implementation: Add your Form submit button script with the following code:

String Strsubmit=label1. Text; Label1 is the ID of the control for which you want the user to submit data.
Strsubmit=strsubmit.replace ("", "" ");

Then save or export the Strsubmit.

The UBB code can also be implemented simply by using this method.

22, Take I and J Maximum value: Math.max (i,j)

such as int x=math.max (5,10); X will take a value of 10

Add a little bit. 23, string comparison ...

23, string comparison is generally used: if (STR1==STR2) {}, but there are other methods:

(1),

String str1; str2
Syntax: STR1. EndsWith (STR2); __ detects if the string str1 is ending with a string str2 and returns a Boolean value. For example:
if (str1. EndsWith (STR2)) {Response.Write ("string str1" is the end of "+str2+");}

(2),

Syntax: STR1. Equals (STR2); __ detects if the string str1 is equal to the string str2, and returns a Boolean value, as in the previous usage.

(3),

Syntax Equals (STR1,STR2); __ detects if the string str1 is equal to the string str2, and returns a Boolean value, as in the previous usage.

24. Find the position of the first (last) occurrence of the specified character or string in the string, and return the index value: IndexOf (), LastIndexOf (), such as:

Str1. IndexOf ("word");//Find the index value of "word" in str1 (position)
Str1. IndexOf ("string");//Find the index value (position) of the first character of the string in str1
Str1. IndexOf ("string", 3,2);//From str1 4th character, look for 2 characters, find the index value of the first character of the string in str1 (position)

25, specify the index bit in the string to insert the specified character: insert (), such as:

Str1. Insert (1, "word"), in str1 the second word prompt insert "word", if str1= "China", after inserting "Chinese character country";

26, in the string left (or right) with a space or specify char character, so that the string reaches the specified length: PadLeft (), PadRight (), such as:

<%
String str1= "Chinese";
Str1=str1. PadLeft (10, ' 1 '); No second argument is plus space
Response.Write (STR1); The result is "1111111 Chinese", with a string length of 10
%>

27. Delete the specified number of characters starting at the specified position: remove ()

28. Reverses the order of the elements in the entire one-dimensional array.

har[] Chararray = "ABCDE". ToCharArray ();
Array.reverse (Chararray);
Console.WriteLine (New String (Chararray));

29. Determine if the nth character in a string is uppercase

String str= "abceedddd";
Response.Write (Char.isupper (str,3));

C # Common functions and methods set Rollup