Count special characters from text file in C# WPF

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i want to write a program in WPF which will read a text.txt file with openfiledialouge and will show result occurrence of only special characters(~!@#$%^&*()_+-) in textbox. I want to count the occurrence of only special characters and output in textbox.

sample output:
Number of #: 242
Number of @ : 212
.
.
.etc

What I have tried:

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

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

}}

Posted 30-Jan-18 6:23am

Ĥãsŋäḭn Ɏḁɋoȱb

Updated 30-Jan-18 19:53pm

v2

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OriginalGriff · Answer 1 · 2018-01-30T06:55:00

Solution 2

See here: Counting Lines in a String[^] - it's to do with lines, but they are just a "special delimiter" (i.e. '\n') which you could replace with an array of "searchable characters".
It presents a variety of ways to do it, and tells you the probable performance cost of each.

Posted 30-Jan-18 6:55am

OriginalGriff

David_Wimbley · Answer 2 · 2018-01-30T06:54:00

So in order to do this I suggest you read up on regexes but here is an example

Regex Class (System.Text.RegularExpressions)[^]

Regular Expression Language - Quick Reference | Microsoft Docs[^]

C# Regular Expressions[^]

[^]

C#

// Define special characters in regex string
var regexString = @"[(~!@#$%^&*()_+\-)]";
// Simulate reading text/content from a file
            var fileContent = @"My name is !@#$@# and I live in #$%%^&^%@! at 100 #$% mainstreet";

            var rex = new Regex(regexString, RegexOptions.IgnoreCase);

            var results = rex.Matches(fileContent);

            foreach (var item in results)
            {
                // find matches on individual items and get count
                var subRegex = Regex.Matches(fileContent, item.ToString());
                Console.WriteLine("Character: {0} - appearances: {1}", item, subRegex.Count);
            }