Question

I have two csv files. In the first file i have a list of users, and in the second file i have a list of duplicate users. Im trying to remove the rows in the first file that are equal to the second file.

Heres the code i have so far:

StreamWriter sw = new StreamWriter(path3);
        StreamReader sr = new StreamReader(path2);

        string[] lines = File.ReadAllLines(path);

        foreach (string line in lines)
        {
            string user = sr.ReadLine();

            if (line != user) 
            {
                sw.WriteLine(line);

            }

File 1 example:

Modify,ABAMA3C,Allpay - Free State - HO,09072701

Modify,ABCG327,Processing Centre,09085980

File 2 Example:

Modify,ABAA323,Group HR Credit Risk & Finance

Modify,ABAB959,Channel Sales & Service,09071036

Any suggestions?

Thanks.

Answer 1

All you’d have to do is change the following file paths in the code below and you will get a file back (file one) without the duplicate users from file 2. This code was written with the idea in mind that you want something that is easy to understand. Sure there are other more elegant solutions, but I wanted to make it as basic as possible for you:

(Paste this in the main method of your program)

        string line;
        StreamReader sr = new StreamReader(@"C:\Users\J\Desktop\texts\First.txt");

        StreamReader sr2 = new StreamReader(@"C:\Users\J\Desktop\texts\Second.txt");

        List<String> fileOne = new List<string>();
        List<String> fileTwo = new List<string>();

        while (sr.Peek() >= 0)
        {
            line = sr.ReadLine();
            if(line != "")
            {
                fileOne.Add(line);
            }
        }
        sr.Close();
        while (sr2.Peek() >= 0)
        {
            line = sr2.ReadLine();
            if (line != "")
            {
                fileTwo.Add(line);
            }
        }
        sr2.Close();
        var t = fileOne.Except(fileTwo);

        StreamWriter sw = new StreamWriter(@"C:\Users\justin\Desktop\texts\First.txt");

        foreach(var z in t)
        {
            sw.WriteLine(z);
        }
        sw.Flush();