Read Textfile and Manipulate Data Using ASP.net C#

Question

What I need is to test every line grouped per date and count number of a certain pattern found in it. In this example find and count "D;" per date

Sample

My expected output to be displayed into textbox

01 - 3

02 - 0

3 - 4

Right now, What I have started is just to read the textfile display just the number of line in the textfile.

 protected void btnRead_Click(object sender, EventArgs e)
    {
        string text = String.Empty;
        int i = 0;
        using (StreamReader stRead = new StreamReader(FileUpload1.PostedFile.InputStream))
        {

            //to write textfile content         
            while (!stRead.EndOfStream)
            {
                //ListBox1.Items.Add(stRead.ReadLine());

                text += stRead.ReadLine() + Environment.NewLine;


                i++;
            }
        }

        TextBox1.Text = text;
        //Label1.Text = i.ToString();
        Label1.Text =  this.TextBox1.Text.Split(new Char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries).Length.ToString();
        //populateListBox();


    }

Just a simple idea on how to start this will be a big help. Thanks

Answer 1

You can use Regex

string test = "D; sjhjsd  D; sdsdjks D;";
MatchCollection collection = Regex.Matches(test, @"[D;]+");
var x= collection.Count;

result :3

This edit show how you can implement above Regex for counting every readed line

protected void btnRead_Click(object sender, EventArgs e)
{
    string text = String.Empty;
    int i = 0;
    int countedChars;
    using (StreamReader stRead = new StreamReader(FileUpload1.PostedFile.InputStream))
    {

        //to write textfile content         
        while (!stRead.EndOfStream)
        {
            var readedLine = stRead.ReadLine() 
            //ListBox1.Items.Add(readedLine );

            if (!string.IsNullOrWhiteSpace(readedLine))
            {
                MatchCollection collection = Regex.Matches(readedLine, @"D;");
                countedChars = collection.Count;
                text += readedLine.Substring(0, readedLine.IndexOf(' ')) +" - "+countedChars + Environment.NewLine;
            }

            i++;
        }
     }

    TextBox1.Text = text;
    //Label1.Text = i.ToString();
    Label1.Text =  this.TextBox1.Text.Split(new Char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries).Length.ToString();
    //populateListBox();


}

Answer 2

Use regular expressions:

    MatchCollection mc = Regex.Matches(lineread, "D;");
int count = mc.Count;

Whole function would be like this:

string[] lines = System.IO.File.ReadAllLines("file.txt");
string result = "";
for(int i=0;i<lines.Length;i++)
{
    MatchCollection mc = Regex.Matches(lines[i], "D;");
    result+= string.Format("{0} - {1}\r\n", i+1, mc.Count);
}

Answer 3

Try with this:

var pattern = "D";
while (!stRead.EndOfStream)
{
    line+= stRead.ReadLine();

    if (!string.IsNullOrEmpty(line))
    {
        var matches = Regex.Matches(line, @"^\d{4}-\d{2}-(\d{2,3})\sproductkey=([\w;]*)");

        if (matches.Count > 0)
        {
            var day = matches[0].Groups[1].Value;
            var productKey = matches[0].Groups[2].Value;
            var count = Regex.Matches(productKey, pattern).Count;

            text += string.Format("{0} - {1}{2}", day, count, Environment.NewLine);
        } 
    }
}
TextBox1.Text = text;

Output:
01 - 3
02 - 0
03 - 4

You can change the pattern and the dates if you want. Example:

2016-12-07 productkey=D;D;D;0;0
2016-12-11 productkey=Y;Y;Y;0;0
2016-12-25 productkey=D;D;D;D;0

var pattern = "Y";

Output:
07 - 0
11 - 3
25 - 0