In C how to check whether a string contains an integer

Question

I just want to know  whether a String variable contains a parsable positive integer value  I do NOT want to parse the value right now    Currently I am doing   int parsedId  if        String IsNullOrEmpty myStringVariable           uint TryParse myStringVariable  out parsedId          show error message    This is ugly - How to be more concise   Note  I know about extension methods  but I wonder if there is something built-in

User · Answer

Maybe this can help  string input    hello123world   bool isDigitPresent   input Any c   gt  char IsDigit c      answer from msdn

User · Answer

Sorry  didn t quite get your question  So something like this   str ToCharArray   Any char IsDigit     Or does the value have to be an integer completely  without any additional strings   if str ToCharArray   All char IsDigit c

User · Answer

You can check if string contains numbers only   Regex IsMatch myStringVariable     -  d       But number can be bigger than Int32 MaxValue or less than Int32 MinValue - you should keep that in mind   Another option - create extension method and move ugly code there   public static bool IsInteger this string s       if  String IsNullOrEmpty s          return false      int i     return Int32 TryParse s  out i       That will make your code more clean   if  myStringVariable IsInteger

User · Answer

string text   Console ReadLine            bool isNumber   false           for  int i   0  i  lt  text Length  i                          if  char IsDigit text i                                  isNumber   true                  break                                   if  isNumber                        Console WriteLine  quot Text contains number  quot                      else                       Console WriteLine  quot Text doesn t contain number  quot                       Console ReadKey     Or Linq          string text   Console ReadLine             bool isNumberOccurance  text Any letter   gt  char IsDigit letter            Console WriteLine  quot  0  quot  isDigitPresent    quot Text contains number  quot     quot Text doesn t contain number  quot            Console ReadKey

User · Answer

This work for me     your string goes here   All char IsDigit

User · Answer

Assuming you want to check that all characters in the string are digits  you could use the Enumerable All Extension Method with the Char IsDigit Method as follows   bool allCharactersInStringAreDigits   myStringVariable All char IsDigit

User · Answer

You could use char IsDigit        bool isIntString    your string  All char IsDigit    Will return true if the string is a number      bool containsInt    your string  Any char IsDigit    Will return true if the string contains a digit

User · Answer

The answer seems to be just no    Although there are many good other answers  they either just hide the uglyness  which I did not ask for  or introduce new problems  edge cases

[c#] In C#, how to check whether a string contains an integer?

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