Asp. NET programming selection 25 Kinds of function source program

1, DateTime Digital type

The following is a reference fragment:

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

1.1 to take the current month and day time currenttime=system.datetime.now seconds;

1.2 Take the current year 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 =currenttime.hour when the current time int is taken;

1.6 Take the current minute int cent =currenttime.minute;

1.7 takes the current second int second =currenttime.second;

1.8 Take the current millisecond int Ms =currenttime.millisecond;

(Variables available in Chinese)

2, int32.parse (variable) int32.parse ("constant")

The following is a reference fragment:

Conversion of character to 32-digit number

3, variable. ToString ()

The following is a reference fragment:

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

The following is a reference fragment:

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

The following is a reference fragment:

codewords conversion to bit code

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

Then you can get the bit length:

len = bytstr.length;

6, System.Text.StringBuilder ("")

The following is a reference fragment:

The string is added, (is the + number 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);

The following is a reference fragment:

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

The following is a reference fragment:

Take remote User IP address

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

The following is a reference fragment:

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 a reference fragment:

Access session value;

For example, assignment: session["username"]= "little Bush";

Take value: Object objname=session["username"];

String strname=objname.tostring ();

Empty: Session.removeall ();

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

The following is a reference fragment:

Transfer variables by using hyperlinks.

If you are building hyperlinks on any page: click

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

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

The following is a reference fragment:

Create a new node for an XML document

13, the parent node. AppendChild (child nodes);

The following is a reference fragment:

Add a new child node under the XML Document parent node

14, the parent node. RemoveChild (node);

The following is a reference fragment:

Delete a node

15, Response

The following is a reference fragment:

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)--Logical type

The following is a reference fragment:

Check whether the specified position is empty character;

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

The following is a reference fragment:

Whether Chag is a punctuation mark

such as: Response.Write (char. Ispunctuation (' A ')); return: False

18, (int) ' character '

The following is a reference fragment:

Turn the characters into numbers, check the code points, and note the single quotes.

Such as:

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

19, (char) code

The following is a reference fragment:

Turn the numbers into characters and look up the characters represented by the code.

Such as:

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

20, Trim ()

The following is a reference fragment:

Clear a space before and after a string

21, string variables. Replace ("substring", "Replace with")

The following is a reference fragment:

String substitution

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