Count character from text file C#

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I m writing a sample programs WPF which will read a text.txt file with openfiledialouge and will show result occurrence of each character including special characters(~!@#$%^&*()_+-) in textbox.
what i wrote is write all content of file to textbox.
I want to count occurrence of each character and output in textbox.

Sample output:

<pre><pre>Number of 'a':10

Number of 'b':20

Number of '@':5

.
.

Number of 'z':15

What I have tried:

protected void Button_Click(object sender, RoutedEventArgs e)
{
    OpenFileDialog openFile = new OpenFileDialog();

    if (openFile.ShowDialog()==true)
    {
        string filepath = openFile.FileName;
        textbox.Text = File.ReadAllText(filepath);


        readbar.Value = 100;

    }

}

Posted 28-Jan-18 1:14am

Danish Kareem

Updated 28-Jan-18 2:04am

v4

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2 solutions

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phil.o · Accepted Answer · 2018-01-28T01:55:00

You could use a Dictionary<char, int> to count each character's occurrences.

C#

Dictionary<char, int> occurrences = new Dictionary<char, int>();
string text = File.ReadAllText(filepath);
foreach (char c in text) {
   if (!occurrences.ContainsKey(c)) {
      occurrences.Add(c, 1);
   }
   else {
      occurrences[c]++;
   }
}

You will end with the number of occurrences of each character in the string. But it may get a little more difficult if your input text file contains unicode characters which cannot be represented by a simple char value.

OriginalGriff · Accepted Answer · 2018-01-28T02:04:00

Solution 2

Try this:

C#

string content = "ABCDEFFGGGHHHHIIIII";
var differentChars = content.GroupBy(g => g).Select (g => new {c = (char) g.Key, count = g.Count()});

You can then use foreach

C#

foreach (var pair in differentChars)
    {
    Console.WriteLine("{0}:{1}", pair.c, pair.count);
    }

Posted 28-Jan-18 2:04am

OriginalGriff