[C#] Text 파일 줄 단위 읽기, 쓰기 (System.IO.File)

using System.IO;
 
private void LoadIPFile(string fpath)
{
    var AllLines = (string[])null;
    var numberOfLines = 0;
    var readLines = 0;
    var ipList = new List<Point>();
 
    if (!File.Exists(fpath))
        return;
 
    if (Path.GetExtension(fpath) != ".ip")
        return;
 
    numberOfLines = File.ReadLines(fpath).Count();
    AllLines = new string[numberOfLines];
 
    using (var sr = File.OpenText(fpath))
    {
        sr.BaseStream.Position = 0;
        readLines = 0;
 
        while (!sr.EndOfStream)
        {
            AllLines[readLines] = sr.ReadLine();
            ++readLines;
        }
    }
 
    for (int i = 0; i < readLines; ++i)
    {
        var words = AllLines[i].Split(new Char[] { '\t', ' ' });
 
        if (words.Length == 4)
        {
            var ip = new Point();
            ip.x = Convert.ToSingle(words[2]);
            ip.y = Convert.ToSingle(words[3]);
            ipList.Add(ip);
        }
        else
        {
            Console.WriteLine("Error : ip 파일 형식이 잘못되었습니다. {0}, 줄 {1}", Path.GetFileName(fpath), readLines);
        }
    }
    this.originGCPs = ipList;
}

using System.IO; 
private bool SavePtsFile(string path, List<Point> pts)
{
    using (var sw = new StreamWriter(path))
    {
        foreach (var pt in pts)
        {
            var line = string.Format("{0}\t{1}", pt.X, pt.Y);
            sw.WriteLine(line);
        }
    }
    return true;
}