Counting how many times a certain char appears in a string before any other char appears

Question

I have many strings  Each string is prepended with at least 1    What is the best way to loop through the chars of each string to count how many   s there are per string   eg     hello  - 1    hello  - 2    h ello  - 2

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The simplest approach would be to use LINQ   var count   text TakeWhile c   gt  c         Count      There are certainly more efficient approaches  but that s probably the simplest

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You could use the Count method  var count   mystring Count x   gt  x

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This is a similar Solution to find how many email addresses included in a string  This way is more efficient    int count   0  foreach  char c in email Trim        if  c         count

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One approach you could take is the following method      Counts how many of a certain character occurs in the given string public static int CharCountInString char chr  string str        return str Split chr  Length-1      As per the parameters this method returns the count of a specific character within a specific string   This method works by splitting the string into an array by the specified character and then returning the length of that array -1

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var str   hello   str Where c   gt  c     l   Count       2

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public static int GetHowManyTimeOccurenceCharInString string text  char c        int count   0      foreach char ch in text                if ch Equals c                         count                         return count

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This code worked for me  class CountOfLettersOfString       static void Main                  Console WriteLine  Enter string to check count of letters            string name   Console ReadLine               Method1         char   testedalphabets   new char 26           int   letterCount   new int 26           int countTestesd   0          Console WriteLine   Given String is  name              for  int i   0  i  lt  name Length - 1  i                          int countChar   1               bool isCharTested   false               for  int j   0  j  lt  testedalphabets Length - 1  j                                  if  name i     testedalphabets j                                         isCharTested   true                      break                                               if   isCharTested                                testedalphabets countTestesd    name i                    for  int k   i   1  k  lt  name Length - 1  k                                          if  name i     name k                                                 countChar                                                            letterCount countTestesd    countChar                  countTestesd                               else                               continue                                   for  int i   0  i  lt  testedalphabets Length - 1  i                          if   char IsLetter testedalphabets i                                  continue                            Console WriteLine    testedalphabets i  - letterCount i                            Method2         var g   from c in name ToLower   ToCharArray      make sure that L and l are the same eg                 group c by c into m                 select new   Key   m Key  Count   m Count               foreach  var item in g                        Console WriteLine string Format  Character  0  Appears  1  times   item Key ToString    item Count                       Console ReadLine

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just a simple answer       public static int CountChars string myString  char myChar                int count   0          for  int i   0  i  lt  myString Length  i                          if  myString i     myChar    count                    return count          Cheers  - Rick

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You could do this  it doesn t require LINQ  but it s not the best way to do it since you make split the whole string and put it in an array and just pick the length of it  you could better just do a while loop and check every character   but it works   int count   test Split      Length - 1

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int count   myString TakeWhile c   gt  c         Count      And without LINQ  int count   0  while count  lt  myString Length  amp  amp  myString count          count

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int count   yourText Length - yourText TrimStart      Length

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int count   Regex Matches myString      Count

[c#] Counting how many times a certain char appears in a string before any other char appears

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