Visual C # Common functions and method set totals

visual| function 1, DateTime digital type

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

1.1 to take the current month and the day seconds

Currenttime=system.datetime.now;

1.2 Take as the year before last

int year =currenttime.year;

1.3 Take the 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 Take the current score

int cent =currenttime.minute;

1.7 Take the current second

int seconds =currenttime.second;

1.8 Take the current millisecond

int millisecond =currenttime.millisecond;
(Variables available in Chinese)

1.9 Chinese date display--year and month

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

1.10 Take Chinese Date show _ Years

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

1.11 Take Chinese date show _ Month Day

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

1.12 Take the current date, format: 2003-9-23

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

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

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

2, character-type conversion to 32-digit digital type

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

3, variable. ToString ()

Character conversion 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 (16 binary)
12345.ToString ("P"); Generate 1,234,500.00%

4, variable. Length Number Type

Length of string:

such as: string str= "China";

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

5, codewords conversion to bit code

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

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

Then you can get the bit length:

len = bytstr.length;

6, System.Text.StringBuilder ("")

string addition, (+ is not the same?) ）

Such as:

System.Text.StringBuilder sb = new System.Text.StringBuilder ("");
Sb. Append ("China");
Sb. Append ("people");
Sb. Append ("Republic");

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

Intercepts a portion of the string, parameter 1 is the left starting bit, and the parameter 2 is the Intercept number.

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 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";

Take 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 hyperlinks on any page: <a href=edit.aspx?fbid=23> Click </a>

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

12. Create new node of XML document

Doc object. createelement ("new section named");

13, add the new child node under the XML Document parent node

The parent node. AppendChild (child nodes);

14, delete the node

The parent node. RemoveChild (node);

15, to the page output: Response

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

Jumps to the page specified by the URL:

Response.Redirect ("URL address");

16, check whether the specified location is empty characters

Char. ISWHITESPCE (string variable, number of digits)--logical type;

　　
Such as:

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

17, check whether the character is a punctuation mark

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

Such as:

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

18, the character into a number, check the code point, note that the single quotation marks.

(int) ' character '

Such as:

Response.Write ((int) ' in '); The result is the code in the word: 20013

19, the number into the character, look up the code represents the character: (char) code

Such as:

Response.Write ((char) 22269); Return to the word "state".

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

21, String replacement

String variable. Replace ("substring", "Replace with")

Such as:

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

Another example: (This very practical)

String Str= "This is

If not replaced, <script> will not appear if it is a script that will run, and the script will not run when replaced.

The value of this code is that you can disable all HTML tags in one text, display them all, and protect your interactive site.

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

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

Then save or output strsubmit.

You can also use this method to easily implement UBB code.

22, take the maximum value of I and J: Math.max (I,J)

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

Add a bit of it. 23. String contrast ...

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

(1),

String str1; str2
Syntax: STR1. EndsWith (STR2); __ The string str1 whether to end with a string str2 returns a Boolean value. For example:
if (str1. EndsWith (STR2)) {Response.Write ("string str1 is terminated" by "+str2+");}

(2),

Syntax: STR1. Equals (STR2); __ Detect string str1 is equal to String str2, return boolean value, usage ibid.

(3),

Syntax Equals (STR1,STR2); __ Detect string str1 is equal to String str2, return boolean value, usage ibid.

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

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

25. Inserts the specified character in the string: Insert (), such as:

Str1. Insert (1, "word"); in str1 the second word entered prompt inserted "word", if str1= "China", inserted after "Chinese word state";

26, in the string left (or right) plus space or specify char characters, so that the string reached the specified length: PadLeft (), PadRight (), such as:

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

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

28. Reverses the order of elements in an 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));