asp.net type conversion class (Universal Class) code sharing _ Practical Tips

Nonsense not much said, directly to everyone to paste the code, the specific code as follows:

 <summary>///type conversion class///handle the case where the database fetch field is empty///</summary> public static class Dbconvert {#region---- --------------ToInt32 type conversion------------------///<summary>///Read the string in the database and convert it to Int32///Null to return 0///</summary >///<param name= "obj" >object type of value </param>///<returns>int32 type </returns> public static I
   NT ToInt32 (object obj) {int result = 0;
   if (Isint (convert.tostring (obj)) {result = Convert.ToInt32 (obj); } else if (obj!= null && obj is enum)//handling non-null value type (or enum) {result = ((iconvertible) obj).
   ToInt32 (NULL);
  return result; ///<summary>///reads the string in the database and converts it to Int32///null returns 0///</summary>///<param name= "str" >string class  Type value </param>///<returns>int32 type </returns> public static int ToInt32 (string str) {int =
   0;
   if (Isint (str)) {result = Convert.ToInt32 (str);
  return result; }///<summary>///Determine if a string is of type int///If yes returns true if it is not returned false///</summary>///<param name= "str" >string value </param&
  Gt
  <returns>true: is a string of int (that is, it can be converted to an int type), false: Not a string of type int </returns> public static bool Isint (String str)
   {bool result = false;
    if (str!= "" && str!=null) {regex reg = new Regex ("^[0-9]*$"); if (Reg.
    IsMatch (str)) {result = true;
  } return result;
  #endregion #region------------------tostring type conversion------------------///<summary>///Read the strings in the database and convert to string </summary>///<param name= "obj" >object type of value </param>///<returns>string type </returns&gt
  ;
   public static string ToString (Object obj) {string result = ' ";
   if (obj!= null) {result = Convert.ToString (obj);
  return result; #endregion #region------------------todouble type conversions------------------///<summary>///Determine whether a string is of type double (package Enclose negative floating-point type)///If yes returns true, if not return false
  </summary>///<param name= "str" >string type of value </param>///<returns>true: is a double string (that is, you can convert
   A double type), false: Not a double string </returns> public static bool Isdouble (string str) {bool = false;
    if (str!= "" && str!= null) {regex reg = new Regex (@ ^ (-?\d+) (\.\d+)? $); if (Reg.
    IsMatch (str)) {result = true;
  } return result; ///<summary>///reads the string in the database and converts it to Int32///null returns 0///</summary>///<param name= "obj" >object class Type value </param>///<returns>int32 type </returns> public static double ToDouble (object obj) {Double R
   Esult = 0.0;
   if (isdouble (convert.tostring (obj)) {result = Convert.todouble (obj); ' Else if ' (obj!= null && obj is enum)//process enum {result = ((iconvertible) obj).
   ToDouble (NULL);
  return result; ///<summary>///reads the string in the database and converts it to Int32///null returns 0///</summary>///<param Name= "str" >string type value </param>///<returns>int32 type </returns> public static double ToDouble (String St
   R) {double result = 0.0;
   if (isdouble (str)) {result = Convert.todouble (str);
  return result;  #endregion #region------------------todatetime type conversions------------------///<summary>///Determine whether the time format is a time type/// such as 23:10///</summary>///<param name= "str" > the string to be judged </param>///<returns>true: is a string of time type (that is, you can
   Convert to Time type), false: Not a string of time type </returns> public static bool Isdatetime (string str) {bool = false; if (str!= "" && str!= null) {regex reg = new Regex (([01]\\d) | (
    2[0-3]): [0-5]\\d]); if (Reg.
    IsMatch (str)) {result = true;
  } return result; } #endregion}//"^\d+ (\.\d+) $"//Non-negative floating-point number (positive floating-point number + 0)//"^ ([0-9]+\.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*)] $ "//positive floating-point number///" ^ (-\d+ (\.\d+)?) | (0+ (\.0+)) $ "//non-positive floating-point number (negative floating-point number + 0)//" ^ (-) ([0-9]+\. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*))] $ "//negative floating-point number//" ^ (-?\d+) (\.\d+)? $ "//floating-point number

OK, asp.net type conversion class (generic Class) code sharing ends here.

Below, look at the example code for the asp.net page data validation generic class.

public class Pagevalidate {private static regex regphone = new Regex ("^[0-9]+[-]?[ 0-9]+[-]?
[0-9]$ ");
private static Regex regnumber = new Regex ("^[0-9]+$"); private static Regex regnumbersign = new Regex ("^[+-]?[
0-9]+$ "); private static Regex Regdecimal = new Regex ("^[0-9]+[.]"?
[0-9]+$ "); private static Regex regdecimalsign = new Regex ("^[+-]?[ 0-9]+[.]? [0-9]+$ "); Equivalent to ^[+-]?\d+[.]? \d+$ private static Regex Regemail = new Regex ("^[\\w-]+@[\\w-]+\\". Com|net|org|edu|mil|tv|biz|info) $ ");//w alphanumeric string, as in [a-za-z0-9] syntax private static Regex REGCHZN = new Regex (" [\
U4E00-\U9FA5] "); Public pagevalidate () {}//numeric string check #region numeric string check public static bool Isphone (string inputdata) {Match m = Regphone.match
(Inputdata);
return m.success; /**////<summary>///checks the key value of the Request query string, whether it is a number, the maximum length limit///</summary>///<param name= "req" >request </param>///<param name= "Inputkey" >request key value </param>///<param name= "MaxLen" > Max length </ Param>///<returns> return REquest query string </returns> public static string Fetchinputdigit (HttpRequest req, string inputkey, int maxlen) {string re Tval = string.
Empty; if (inputkey!= null && inputkey!= string. Empty) {RetVal = req.
Querystring[inputkey]; if (null = = RetVal) RetVal = req.
Form[inputkey]; if (null!= retVal) {retVal = SQLText (RetVal, MaxLen); if (! Isnumber (retVal)) RetVal = string.
Empty; } if (retVal = null) RetVal = string.
Empty;
return retVal; /**////<summary>///Whether numeric string///</summary>///<param name= "inputdata" > Input string </param>///< returns></returns> public static bool Isnumber (string inputdata) {Match m = Regnumber.match (Inputdata); .
Success; /**////<summary>///Whether numeric strings can be signed///</summary>///<param name= "inputdata" > Input string </param>// /<returns></returns> public static bool Isnumbersign (string inputdata) {Match m = regnumbersign.match (input
Data);
return m.success; }/**////<summary>///whether it isFloating point number///</summary>///<param name= "inputdata" > Input string </param>///<returns></returns> public static bool Isdecimal (string inputdata) {Match m = Regdecimal.match (Inputdata); return m.success;}/**////<su Mmary>///is a floating-point number with positive and negative///</summary>///<param name= "inputdata" > Input string </param>///<returns ></returns> public static bool Isdecimalsign (string inputdata) {Match m = Regdecimalsign.match (inputdata); Retu
RN m.success; #endregion//Chinese detection #region/**////<summary>///detect if there are Chinese characters///</summary>///<param name= "Inputdata" & gt;</param>///<returns></returns> public static bool Ishaschzn (string inputdata) {Match m = regchzn.m
Atch (Inputdata);
return m.success; #endregion//mail address #region mail address/**////<summary>///is a floating-point number with positive and negative///</summary>///<param name= "Inputdat A "> Input string </param>///<returns></returns> public static bool Isemail (string inputdata) {MAtch m = Regemail.match (Inputdata);
return m.success; #endregion//Other #region other/**////<summary>///Check the maximum length of the string, return a specified length of string///</summary>///<param name= "Sqlinp
UT "> Input string </param>///<param name=" maxLength "> Max length </param>///<returns></returns> public static string SQLText (string sqlinput, int maxLength) {if (sqlinput!= null && sqlinput!= string. Empty) {sqlinput = Sqlinput.trim (); if (Sqlinput.length > MaxLength)//To intercept the string by the maximum length sqlinput = sqlinput.substring (0, MaxL
Ength);
return sqlinput; /**////<summary>///string encoding///</summary>///<param name= "Inputdata" ></param>///<returns ></returns> public static string HtmlEncode (String inputdata) {return httputility.htmlencode (inputdata);}/** <summary>///Settings Label displays encode string///</summary>///<param name= "LBL" ></param>///< param name= "txtinput" ></param> public static void SetLabel (Label lbl, String txtInput) {lbl.
Text = HtmlEncode (txtinput); public static void SetLabel (Label lbl, Object inputobj) {SetLabel (LBL, inputobj.tostring ());}//String cleanup public static St  Ring Inputtext (string inputstring, int maxLength) {StringBuilder retVal = new StringBuilder ();//Check for empty if (inputstring  != null) && (inputstring!= String.Empty)) {inputstring = Inputstring.trim ();//Check length if (Inputstring.length >
maxLength) inputstring = inputstring.substring (0, maxLength);
Replace the dangerous character for (int i = 0; i < inputstring.length i++) {switch (inputstring[i)) {case ' "': Retval.append (" ");
Break
Case ' < ': Retval.append ("<");
Break
Case ' > ': Retval.append (">");
Break
Default:retVal.Append (Inputstring[i]);
Break
} retval.replace ("'", "");//replace single quotes} return retval.tostring ();} /**////<summary>///converted to HTML code///</summary>///<param name= "str" >string</param>///<re turns>string</returns> public static string Encode (String str) {str = str.Replace ("&", "&"); str = str.
Replace ("'", "" "); str = str.
Replace ("\" "," ""); str = str.
Replace ("", " "); str = str.
Replace ("<", "<"); str = str.
Replace (">", ">"); str = str.
Replace ("\ n", "<br>");
return str; /**////<summary>///Parsing html to normal text///</summary>///<param name= "str" >string</param>///<r eturns>string</returns> public static string Decode (String str) {str = str.
Replace ("<br>", "\ n"); str = str.
Replace (">", ">"); str = str.
Replace ("<", "<"); str = str.
Replace (" ", ""); str = str.
Replace ("" "," \ ");
return str; public static string Sqltextclear (String sqltext) {if (SQLText = null) {return null;} if (SQLText = = "") {return ""
; } SQLText = Sqltext.replace (",", "");/removal, sqltext = Sqltext.replace ("<", "");/removal < SQLText = Sqltext.replace ("> "," ");//remove > SQLText = Sqltext.replace ("--"," ");//Remove-SQLText = Sqltext.replace (" "," ");//remove ' SQLText = Sqltext.repl Ace ("\" "," "");//Remove "sq"Ltext = sqltext.replace ("=", "");/remove = SQLText = Sqltext.replace ("%", "");//Remove% SQLText = Sqltext.replace ("", "");//Remove spaces
return sqltext; #endregion//Whether it consists of a specific character #region whether a particular character constitutes public static bool Iscontainsamechar (string strinput) {string charinput = Strin
G.empty; if (!string. IsNullOrEmpty (strinput)) {charinput = strinput.substring (0, 1);} return Iscontainsamechar (Strinput, Charinput,
Strinput.length); public static bool Iscontainsamechar (string strinput, string charinput, int leninput) {if (string). IsNullOrEmpty (Charinput)) {return false;} else {regex regnumber = new Regex (string.
Format ("^ ([{0}]) +$", charinput); Regex regnumber = new Regex (string.
Format ("^ ([{0}]{{1}}}) +$", charinput,leninput));
Match m = Regnumber.match (strinput);
return m.success; } #endregion//Check that the input parameters are not some well-defined special characters: This method is currently used for password entry security checks #region Check that the input parameter is not some defined special character: This method is currently used for password entry security/**////< Summary>///Check that the input parameters are not some well-defined special characters: This method is currently used for password entry security checks///</summary> public static bool Iscontainspecchar (String strinput) {string[] list = new string[] {"123456", "654321"}; bool result = new bool (); for (int i = 0; i < l Ist. Length;
i++) {if (strinput = = List[i]) {result = true; } #endregion}