Asp.Net function set

Author：Eve Cole Update Time：2009-06-29 23:46:59

1. DateTime numeric type
System.DateTime currentTime=new System.DateTime();
1.1 Get the current year, month, day, hour, minute and second
currentTime=System.DateTime.Now;
1.2 Get the current year
int year=currentTime.Year;
1.3 Get the current month
int month=currentTime.Month;
1.4 Get the current day
int day=currentTime.Day;
1.5 Get the current tense
int hour=currentTime.Hour;
1.6 Get current points
int minutes=currentTime.Minute;
1.7 Get the current second
int seconds=currentTime.Second;
1.8 Get the current millisecond
int milliseconds=currentTime.Millisecond;
(Variables are available in Chinese)

2. Int32.Parse (variable) Int32.Parse ("constant")
Convert character type to 32-bit digital type

3. Variable.ToString()
Convert character 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 (hexadecimal)
12345.ToString("p"); //Generate 1,234,500.00%

4. Variable .Length takes the string length in numeric type:
For example: string str="China";
int Len = str.Length; //Len is a custom variable, str is the variable name of the string to be tested

5. System.Text.Encoding.Default.GetBytes (variable)
Convert word code to bit code such as: byte[] bytStr = System.Text.Encoding.Default.GetBytes(str);
Then the bit length can be obtained:
len = bytStr.Length;

6. System.Text.StringBuilder("")
Adding strings, (is the same with the + sign?)
For example: System.Text.StringBuilder sb = new System.Text.StringBuilder("");
sb.Append("China");
sb.Append("People");
sb.Append("Republic");

7. Variable.Substring(parameter 1, parameter 2);
Intercept a part of the string, parameter 1 is the starting digit from the left, parameter 2 is the number of digits to intercept.
For example: string s1 = str.Substring(0,2);

8. String user_IP=Request.ServerVariables["REMOTE_ADDR"].ToString();
Get the remote user’s IP address

9. Get the remote user’s real IP address through the proxy server:
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"];
Access Session value;
For example, assignment: Session["username"]="Bush";

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

11. String str=Request.QueryString["Variable"];
Transfer variables using hyperlinks.
To create a hyperlink on any page: <a href=Edit.aspx?fbid=23>Click</a>
Get the value in the Edit.aspx page: String str=Request.QueryString["fdid"];

12. DOC object.CreateElement("New node name");
Create a new XML document node

13. Parent node.AppendChild (child node);
Add the newly created child node to the parent node of the XML document

14. Parent node.RemoveChild(node);
Delete node

15, Response
Response.Write("string");
Response.Write(variable);
Output to the page.

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

16. char.IsWhiteSpce (string variable, number of digits) - logical check whether the specified position is a null character;
like:
string str="Chinese people";
Response.Write(char.IsWhiteSpace(str,2)); //The result is: True, the first character is 0, and 2 is the third character.

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

18. (int)'Character'
Convert characters to numbers and look up code points. Note the single quotes.
like:
Response.Write((int)'中'); //The result is the Chinese character code: 20013

19. The (char) code converts numbers into characters and checks the characters represented by the code.
like:
Response.Write((char)22269); //Return the character "国".

20. Trim()
Clear spaces before and after the string

21, string variable.Replace("substring", "replace with")
String replacement such as:
string str="China";
str=str.Replace("国","central"); //Replace the national character with the central character
Response.Write(str); //The output result is "center".

Another example: (this is very practical)

string str="This is a <script> script";
str=str.Replace("<","<font><</font>"); //Replace the left angle bracket with <font> and < and </font> (or replace it with <, but it is estimated to be processed by XML After saving, it will still be restored if you submit it again)
Response.Write(str); //Displayed as: "This is a <script> script".

If it is not replaced, <script> will not be displayed. If it is a script, it will run; after replacement, the script will not run.
The value of this code is that you can invalidate all HTML tags in a text, display them all, and protect your interactive site.
Specific implementation: Add the following code to your form submit button script:
string strSubmit=label1.Text; //label1 is the control ID where you ask users to submit data.
strSubmit=strSubmit.Replace("<","<font><</font>");
Then save or output strSubmit.
UBB code can also be easily implemented using this method.

22. Math.Max(i,j)
Take the maximum value between i and j, such as int x=Math.Max(5,10); // Add

a little to the value of x 10 23. String comparison...
Add a little bit

23. String comparison is generally used: if(str1==str2){ }, but there are other methods:

(1),
string str1; str2
//Syntax: str1.EndsWith(str2); __Detect whether the string str1 ends with the string str2 and return a Boolean value. For example:
if(str1.EndsWith(str2)){ Response.Write("String str1 ends with "+str2+""); }

(2),
//Syntax: str1.Equals(str2); __Check whether the string str1 is equal to the string str2 and return a Boolean value. The usage is the same as above.

(3),
//Syntax Equals(str1,str2); __Check whether the string str1 is equal to the string str2 and return a Boolean value. The usage is the same as above.

24. IndexOf(), LastIndexOf()
Find the first (last) occurrence of a specified character or string in a string and return the index value, such as:
str1.IndexOf("word"); //Find the index value (position) of "word" in str1
str1.IndexOf("string"); //Find the index value (position) of the first character of "string" in str1
str1.IndexOf("string",3,2);//Start from the 4th character of str1, search for 2 characters, and find the index value (position) of the first character of "string" in str1

25. Insert()
Inserts the specified character at the specified index in the string. like:
str1.Insert(1,"字"); Insert "character" at the second character of str1. If str1="China", the inserted character will be "中文国";

26. PadLeft(), PadRight()
Add a space or specify a char character to the left (or right) of the string to make the string reach the specified length, such as:
<%
string str1="Chinese";
str1=str1.PadLeft(10,'1'); //If there is no second parameter, add a space
Response.Write(str1); //The result is "1111111 Chinese", the string length is 10
%>

27. Remove()
To delete a specified number of characters from a specified position, string comparison is generally used: if(str1==str2){ }, but there are other methods:

1.
string str1; str2
//Syntax: str1.EndsWith(str2); __Detect whether the string str1 ends with the string str2 and return a Boolean value. For example:
if(str1.EndsWith(str2)){ Response.Write("String str1 ends with "+str2+""); }

2.
//Syntax: str1.Equals(str2); __Check whether the string str1 is equal to the string str2 and return a Boolean value. The usage is the same as above.

3.
//Syntax Equals(str1,str2); __Check whether the string str1 is equal to the string str2 and return a Boolean value. The usage is the same as above.

IndexOf()
Find the first occurrence of a specified character or string in a string and return the first index value, such as:
str1.IndexOf("word"); //Find the index value (position) of "word" in str1
str1.IndexOf("string"); //Find the index value (position) of the first character of "string" in str1
str1.IndexOf("string",3,2);//Start from the 4th character of str1, search for 2 characters, find the index value (position) of the first character of "string" in str1

1.9 takes Chinese date display - year, month, day, hour and minute
string strY=currentTime.ToString("f"); //Do not display seconds

1.10, get the Chinese date display_year and month
string strYM=currentTime.ToString("y");

1.11 Get Chinese date display_month and day
string strMD=currentTime.ToString("m");

1.12 Get the current year, month and day, the format is: 2003-9-23
string strYMD=currentTime.ToString("d");

1.13 Get the current hour and minute, the format is: 14:24
string strT=currentTime.ToString("t");
Update, the above cannot be edited:

c#.net function and method set (please add them together)

1.9 Get Chinese date display - year, month, day, hour and minute
string strY=currentTime.ToString("f"); //Do not display seconds

1.10, get the Chinese date display_year and month
string strYM=currentTime.ToString("y");

1.11 Get Chinese date display_month and day
string strMD=currentTime.ToString("m");

1.12 Get the Chinese year, month and day
string strYMD=currentTime.ToString("D");
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1.13 Get the current time and minute, the format is: 14:24
string strT=currentTime.ToString("t");

1.14 Get the current time, the format is: 2003-09-23T14:46:48
string strT=currentTime.ToString("s");

1.15 Get the current time, the format is: 2003-09-23 14:48:30Z
string strT=currentTime.ToString("u");

1.16 Get the current time, the format is: 2003-09-23 14:48
string strT=currentTime.ToString("g");

1.17 Get the current time, the format is: Tue, 23 Sep 2003 14:52:40 GMT
string strT=currentTime.ToString("r");

1.18 Get the date and time n days after the current time
DateTime newDay = DateTime.Now.AddDays(100);

2. Int32.Parse(variable) Int32.Parse("constant")
Convert character type to 32-bit digital type