Asp. NET network programming in 27 sets of functions commonly used

1, DateTime Digital type

The following is the referenced content: System.DateTime currenttime=new System.DateTime (); 1.1 Take the current month and day time of the second currenttime=system.datetime.now; 1.2 Take the current year 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 takes the current time int when =currenttime.hour; 1.6 Take the current sub-int sub-=currenttime.minute; 1.7 takes the current second int seconds =currenttime.second; 1.8 takes the current millisecond int milliseconds =currenttime.millisecond; (Variable available in Chinese) 2, int32.parse (variable) int32.parse ("constant")

The following is the referenced content: Character conversion to 32-bit digital type

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3, variables. ToString ()

The following is the referenced content: 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

The following is the referenced content: 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. System.Text.Encoding.Default.GetBytes (variable)

The following is the referenced content: Loadline conversion to bit code 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 following is the referenced content: The string is added, (the + number is not 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);

The following is the referenced content: 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, String user_ip=request.servervariables["REMOTE_ADDR"]. ToString ();

The following is the referenced content: Take the remote User IP address

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

The following is the referenced content: 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"];

The following is the referenced content: Access session value; For example, assignment: session["username"]= "little Bush"; Value: Object objname=session["username"]; String strname=objname.tostring (); Emptying: Session.removeall ();

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

The following is the referenced content: Use hyperlinks to transfer variables. If you are building a hyperlink on any page: click Value in edit.aspx page: String str=request.querystring["Fdid"];

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

The following is the referenced content: Create a new XML document node

13, parent node. AppendChild (sub-node);

The following is the referenced content: Add a new child node to the XML document parent node

14, parent node. RemoveChild (node);

The following is the referenced content: Delete a node

15, Response

The following is the referenced content: Response.Write ("string"); Response.Write (variable); Output to the page. Response.Redirect ("URL address"); Jumps to the page specified by the URL

16, Char. ISWHITESPCE (string variable, number of digits)--Logic type

The following is the referenced content: Check if the specified position is null character; 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, Char. Ispunctuation (' character ')--Logic type

The following is the referenced content: Whether Chag is a punctuation mark such as: Response.Write (char. Ispunctuation (' A ')); return: False

18, (int) ' character '

The following is the referenced content: Turn the characters into numbers, check the code points, and note the single quotes. Such as: Response.Write ((int) ' Medium '); Code with result for Chinese characters: 20013

19, (char) code

The following is the referenced content: Convert a number to a character and look up the character represented by the code. Such as: Response.Write ((char) 22269); Returns the word "country".

20. Trim ()

The following is the referenced content: Clear space before and after string

21, string variables. Replace ("sub-string", "Replace with")

The following is the referenced content: String substitution 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 <script> script"; Str=str. Replace ("<", "<font><</font>"); Replace the left angle bracket with <font> < with </font> (or <, but estimate that it will be restored after XML has been saved) Response.Write (str); Display as: "This is <script> script" If you do not replace,<script> will not be displayed, if it is a script, it will run, and the script will not run when 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 ("<", "<font><</font>"); Then save or export the Strsubmit. The UBB code can also be implemented simply by using this method.

22, Math.max (I,J)

The following is the referenced content: The maximum value in I and J is taken such as int x=math.max (5,10); X will take a value of 10 Add a little bit. 23, string comparison ... Add a little.

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

The following is the referenced content: (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, IndexOf (), LastIndexOf ()

The following is the referenced content: Finds the position of the first (last) occurrence of a specified character or string in a string, returning an index value, 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. Insert ()

The following is the referenced content: Inserts the specified character into the string by specifying the index bit. Such as: Str1. Insert (1, "word"), in str1 the second word prompt insert "word", if str1= "China", after inserting "Chinese character country";

26, PadLeft (), PadRight ()

The following is the referenced content: Add a space to the left (or right) of the string, or specify a char character, so that the string reaches the specified length, 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. Remove ()

The following is the referenced content: Deletes the specified number of characters starting at the specified position String comparisons are generally used: if (STR1==STR2) {}, but there are other ways:

Asp. NET network programming in 27 sets of functions commonly used