How to read a text file reversely with iterator in C#

Question

I need to process a large file, around 400K lines and 200 M. But sometimes I have to process from bottom up. How can I use iterator (yield return) here? Basically I don\'t l

Answer 1

I put the file into a list line by line, then used List.Reverse();

        StreamReader objReader = new StreamReader(filename);
        string sLine = "";
        ArrayList arrText = new ArrayList();

        while (sLine != null)
        {
            sLine = objReader.ReadLine();
            if (sLine != null)
                arrText.Add(sLine);
        }
        objReader.Close();


        arrText.Reverse();

        foreach (string sOutput in arrText)
        {

...