CODEWITHSUNDEEP
c#stringcount
puretppc
puretppc

Reputation: 3292

How do I check the number of occurences of a certain string in another string?

string containsCharacter = textBox1.Text;
string testString = "test string contains certain characters";
int count = testString.Split(containsCharacter).Length - 1;

I originally pulled this code off another person's question's answer but it doesn't seem to work with text boxes.

Errors I'm getting:

The best overloaded method match for 'string.Split(params char[])' has some invalid arguments
Argument 1: cannot convert from 'string' to 'char[]'

I prefer to fix this code rather than use other things like LINQ but I would accept it if there isn't a way to fix this code.

Upvotes: 1

Views: 137

Answers (6)

DaEagle
DaEagle

Reputation: 136

Edit: Upon Reading your code more carefully I suggest you do this, you should rephrase your question to "Check the number of occurences of a certain string in Another string":

string containsString = "this";
string test = "thisisateststringthisisateststring";
var matches = Regex.Matches(test,containsString).Count;

matches is 2!

My initial post answers your actual question "occurrences of a certain character in a string":

string test = "thisisateststring";
int count = test.Count(w => w == 'i');

Count is 3!

Upvotes: 1

weeksdev
weeksdev

Reputation: 4355

You could iterate through the characters

        string value = "BANANA";
        int x = 0;
        foreach (char c in value)
        {
            if (c == 'A')
                x++;
        }

Upvotes: 5

user2480047
user2480047

Reputation:

The Split version you are using expects a character as input. This is the version for strings:

    string containsText = textBox1.Text;
    string testString = "test string contains certain characters";
    int count = testString.Split(new string[]{containsText}, StringSplitOptions.None).Length - 1;

With this code, count will be: 1 if textBox1.Text includes "test", 6 if it contains "t", etc. That is, it can deal with any string (whose length might be one, as a single character, or as big as required).

Upvotes: 2

Aleksei Poliakov
Aleksei Poliakov

Reputation: 1332

"this string. contains. 3. dots".Split(new[] {"."}, StringSplitOptions.None).Count() - 1

Upvotes: 1

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726987

You can call ToCharArray on the string to make it a char[], like this:

int count = testString.Split(containsCharacter.ToCharArray()).Length - 1;

Since Split takes characters as a param, you could rewrite this by listing the characters being counted directly, as follows:

int count = testString.Split(',', ';', '-').Length - 1;

Upvotes: 1

Johnbot
Johnbot

Reputation: 2179

string containsCharacter = "t";
string testString = "test string contains certain characters";
int count = testString.Count(x => x.ToString() == containsCharacter);

This example will return 6.

Upvotes: 3

Related Questions