How to Count Occurrences of a Character Inside a String in C#

This tutorial will introduce the methods to get the number of occurrences of a character in a string variable in C#.

Count Occurrences of a Character in a String With the Linq Method in C#

Linq integrates SQL functionalities on data structures in C#. The following code example shows us how we can get the number of occurrences of a character in a string with the Linq method in C#.

using System;
using System.Linq;

namespace count_occurrences_of_a_char_in_string {
  class Program {
    static void Main(string[] args) {
      string source = "/once/upon/a/time/";
      int count = source.Count(f => f == 'o');
      Console.WriteLine(count);
    }
  }
}

Output:

2

In the above code, we calculated the number of occurrences of the character o in the string variable source with the Linq method in C#.

Count Occurrences of a Character in a String With the String.Split() Method in C#

The String.Split() method splits a string into multiple substrings based on a separator in C#. The String.Split(x) method would return 1 string more than the number of occurrences of x in the string. We can count the number of strings returned by the String.Split() method and subtract 1 from it to get the number of occurrences of the character inside the main-string. The following code example shows us how we can count the number of occurrences of a character in a string variable with the String.Split() method in C#.

using System;
using System.Linq;

namespace get_first_char_of_string {
  class Program {
    static void Main(string[] args) {
      string source = "/once/upon/a/time/";
      int count = source.Split('o').Length - 1;
      Console.WriteLine(count);
    }
  }
}

Output:

2

In the above code, we calculated the number of occurrences of the character o in the string variable source with the String.Split() function in C#.

Count Occurrences of a Character in a String With the foreach Loop in C#

The foreach loop is used to iterate through a data structure in C#. We can use the foreach loop to iterate through each character of our string variable and check whether the character matches our desired character with an if statement in C#. The following code example shows us how we can count the number of occurrences of a character inside a string with the foreach loop in C#.

using System;
using System.Linq;

namespace get_first_char_of_string {
  class Program {
    static void Main(string[] args) {
      string source = "/once/upon/a/time/";
      int count = 0;
      foreach (char c in source) {
        if (c == 'o') {
          count++;
        }
      }
      Console.WriteLine(count);
    }
  }
}

Output:

2

In the above code, we calculated the number of occurrences of the character o in the string variable source with the foreach loop in C#.