c # .net list of commonly used functions

1, DateTime numeric
System.DateTime = currentTime new new System.DateTime ();
1.1 take the current date, day, hour
currentTime = System.DateTime.Now;
1.2 in the current taken
int Year currentTime.Year =;
1.3 take the current month
int month currentTime.Month =;
1.4 take the current date
int day currentTime.Day =;
for 1.5 take the current when
int currentTime.Hour time =;
1.6 take the current sub-
int points currentTime.Minute =;
1.7 seconds to get the current
int second currentTime.Second =;
1.8 take current millisecond
int milliseconds currentTime.Millisecond =;
(Chinese variable available)

1.9 taking Chinese date - time division date
string strY = currentTime.ToString ( "f" ); // do not show seconds

1.10 take in Chinese date _ May
String strYM currentTime.ToString = ( "Y");

1.11 _ taking Chinese date month day
string strMD = currentTime.ToString ( "m" );

1.12 take the current date, in the format: 2003-9-23
String strYMD currentTime.ToString = ( "D");

1.13 take the current division in the format: 14: 24
String currentTime.ToString STRT = ( "T");

2, Int32.Parse (variable) the Int32.Parse ( "constant")
character font converted into 32-bit

3, variable .ToString ()
character converted into a string
12345.ToString ( "n"); // generating 12,345.00
12345.ToString ( "C"); // 12,345.00 generating ¥
12345.ToString ( "E"); // 004 generates 1.234500e
12345.ToString ( "F4"); // generates 12345.0000
12345.ToString ( "X "); // generates 3039 (hexadecimal)
12345.ToString (" P "); // generate 1,234,500.00%


4, numeric variable .Length
taken word length:
as: string str =" Chinese ";
int = Len str.length; variable name // Len is custom variables, str seek is measured string

5, System.Text.Encoding.Default.The GetBytes (variable)
word bit code converted into
Such as: byte [] bytStr = System.Text.Encoding.Default.GetBytes ( str);
and available bit length:
len = bytStr.Length;

. 6, the System.Text.StringBuilder ( "")
strings added (No. is not the same)?
such as: System.Text.StringBuilder SB = new new System.Text.StringBuilder ( "");
sb.append ( "China");
sb.append ( "people");
sb.append ( "Republic ");

7, .substring variable (parameter 1, parameter 2);
taken part of the string, the start bits to the left of the parameter 1, parameter 2, taken a few.
Such as: str.Substring String S1 = (0,2);

. 8, the Request.ServerVariables String user_ip = [ "REMOTE_ADDR"] the ToString ();.
Take the remote IP address of the user

9, the user through the remote proxy take real IP address:
IF (the Request.ServerVariables [ "HTTP_VIA"] = null!) {
String = user_ip the Request.ServerVariables [ "HTTP_X_FORWARDED_FOR"] the ToString ();.
} the else {
. = String user_ip the Request.ServerVariables [ "REMOTE_ADDR"] the ToString ();
}

10, Session [ "variable"];
Access Session value;
e.g., assignment: Session [ "username"] = " Bush";

Value: = the objName the Session Object [ "username"];
String objName.ToString strName = ();
Clear: Session.RemoveAll ();

. 11, STR String = Request.QueryString [ "variable"];
hyperlinked variable transmission.
In either built as a hyperlink: <a href=Edit.aspx?fbid=23> Click </a>
value in Edit.aspx page: String str = Request.QueryString [ "fdid"];

12, DOC Object .CreateElement ( "new node name");
to create a new XML document node

13, the parent node .AppendChild (child nodes);
the XML document is added under the new parent of the child node

14, the parent node .RemoveChild (node);
deleted node

15, the Response
Response.Write ( "string"



Response.Redirect ( "URL address");
jump to the URL specified page

16, char.IsWhiteSpce (string variable, the number of bits) - Logical
check whether the specified location null character;
such as:
String str = "Chinese people" ;
Response.Write (char.IsWhiteSpace (str, 2)); // result: True, the first character is 0, 2 is the third character.

17, char.IsPunctuation ( '' '' character '' '') - Logical
check whether the punctuation character
such as: Response.Write (char.IsPunctuation ( '' ' ' A '' '')); // returns: False

18 is, (int) '' '' 'character'
the character to digital, check the code point, note the single quotation marks.
Such as:
Response.Write ((int) '' '' in '' ''); // code word results: 20013

. 19, (char) code for
the character into a digital, check code representing characters.
Such as:
Response.Write ((char) 22269); // returns "national" character.

20, Trim ()
Clear a space before and after the string

21, the string variable.



str = str.Replace ( "country", "Central"); // change the country's character as a central character
Response.Write (str); // output is "central"

Again :( this very practical)

String str = " this is the <script> script ";
STR = str.replace (" < "," <font> << / font> "); // replace the left angle brackets <font> and <and </ font> (or replaced <, it is estimated that after various XML deposit, will then propose reduction)
Response.Write (str); // read: "this is a <script> script"

if you do not replace, <script> will not be displayed, if This is a script that will run; and after the replacement, the script will not run.
The value of this code is: You can make all the HTML tags in the text of a failure, all displayed to protect your site has interactive.
Specific implementation: submit your form button script to add the following codes:
String = strSubmit Label1.Text; // label1 you allow users to submit data to the control ID.
strSubmit = strSubmit.Replace ( "<", "<font> << / font>");
and then save or output strSubmit.
This method may also be used to achieve a simple UBB code.

22, Math.Max (i, j)
takes the maximum value of i and j
as int x = Math.Max (5,




str1 String; str2
// Syntax: str1.EndsWith (str2); __ detect whether the end of the string str1 string str2, returns a Boolean value, such as:.
IF (str1.EndsWith (str2)) {Response.Write ( "word str1 string is "str2" ends ");}

(2),
// syntax: str1.Equals (str2); __ detection is equal to the string str1 str2 string, it returns a Boolean value, use ibid.

(3 ),
// syntax Equals (str1, str2); __ detection is equal to the string str1 string str2, returns a Boolean value, use ibid.

24-, IndexOf (), LastIndexOf ()
Find string in a specified character or string position for the first time (last time) appears, returns the index, such as:
str1.IndexOf ( "word"); // find the "word" in str1 index value of (position)
str1.IndexOf ( "string"); / / find "string" index value of the first character in str1 (position)
str1.IndexOf ( "string", 3,2); // str1 from the fourth character, 2 characters lookup, to find "string" in the first character index value (position) in str1 to

25, insert ()
specified index bits into the specified character string. Such as:
str1.Insert (. 1, "word"); Insert "word" in the second character str1 if str1 = "Chinese"




string str1 = "Chinese people";
str1 = str1.PadLeft (10, '' ''. 1 '' ''); // no second parameter spaces
Response.Write (str1); // result is "1111111 China people ", the string length of 10
%>

27, the remove ()
character deletes a specified number from the specified position
comparison string are generally used: if (str1 == str2) { }, but there are other methods:

1,
str1 String; str2
// syntax: str1.EndsWith (str2); __ detect whether the end of the string str1 string str2, returns a Boolean value, such as:.
iF (str1.EndsWith (str2)) {Response.Write ( "word str1 string is "str2" ends ");}

2,
@ syntax: str1.Equals (str2); __ detection is equal to the string str1 str2 string, returns a Boolean value, use ibid.

3,
// syntax Equals (str1, str2); __ detection is equal to the string str1 string str2, returns a Boolean value, use ibid.

IndexOf ()
to find the location specified character string or the string is first found, return the first index value, such as:
str1.IndexOf ( "word"); // find the "word" str1 index value (position)
str1.IndexOf ( "string"); // Find the "string" of the first character index value (position in str1)
str1.IndexOf ( "string", 3,2); // str1 from the fourth character, 2 characters lookup, to find an index value of "string" in the first character str1 (position)  Shenzhen surrogate electric 13,802,269,370   surrogate micro 13,802,269,370   Beijing surrogate micro 13,802,269,370