Search text files for string

tig2810 · #1 July 5th, 2009, 03:26 PM

Hi all
This sounds easy and I'm sure it is but i'm just having so much trouble. I have a directory with text files. I want to search the text files for a string and return the name of the file that containes the string. I've tried various way below ut unsuccessfully. Please could someone take a look and offer some assistance?
thanks

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            string directory = @"D:\SearchFolder";

            DirectoryInfo dirinfo = new DirectoryInfo(directory);
 
            FileInfo[] files = dirinfo.GetFiles("EE*.PRN");
 
            foreach (FileInfo i in files)

            {                

                List<string> lines = File.ReadAllLines(i.ToString().ToList());

                foreach (string line in lines)

                {

                    if (line.Contains("UNIQUESTRING"))

                        textBox2.Text += i + "contains" + line.ToString() + Environment.NewLine;

                }
 
                //Regex.Match(i, "UNIQUESTRING");

                //if (Regex.Match(i, "UNIQUESTRING")) 

                //{

                //    MessageBox.Show("File with regex is : " + i);

                //}
 
                //string ex = null;

                //ex = (from line in File.ReadAllLines(i)

                //      where line == "UNIQUESTRING"

                //      select line).ToString();
 
        }

tlhintoq · #2 July 5th, 2009, 04:17 PM

Are you actually looking for the word "UNIQUESTRING" in all upper case?
Or is UNIQUESTRING meant to be a variable thus shouldn't have quotes around it?

.Contains is case-sensitive so could that be the issue? You are searching for upper case in a lower case file?

tig2810 · #3 July 5th, 2009, 04:20 PM

Yes, the string would be in all uppercase. The contents of the text files are also in uppercase.

tig2810 · #4 July 5th, 2009, 04:25 PM

I should probably add that the snippet of code does not compile as i'm having some more type problems.

tlhintoq · #5 July 6th, 2009, 12:25 AM

Well... yeah... Not compiling will keeping it from finding what you are searching for.

insertAlias · #6 July 6th, 2009, 04:25 PM

This should help:

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 string path = @"c:\dev\somedir";

string searchtext = "something";

DirectoryInfo di = new DirectoryInfo(path);

FileInfo[] files = di.GetFiles("*.txt");

foreach (FileInfo file in files)

{

    using (StreamReader sr = new StreamReader(file.FullName))

    {

        string content = sr.ReadToEnd().ToLower();

        if(content.Contains(searchtext.ToLower()))

            Console.WriteLine("{0} contains \"{1}\"",file.Name,searchtext);

        else

            Console.WriteLine("{0} does not contain \"{1}\"", file.Name, searchtext);

    }

}

This is written for a console app, so you will have to make appropriate changes.

Search text files for string

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