C# 按行读取文件 从某行开始取

int i = 0;
            FileStream fs = new FileStream(e.FullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            using (StreamReader sr = new StreamReader(fs, System.Text.Encoding.Default))
            {
                while (sr.Peek() > -1)
                {
                    i++;
                    if (i > LineNum)
                    {
                        Console.WriteLine("T:" + sr.ReadLine());
                    }
                    else
                    {
                        sr.ReadLine();
                        Console.WriteLine("F:" + sr.ReadLine());
                    }
                }
            }
            if (i != 0)
            {
                LineNum = i;
                Console.WriteLine("LineNum:" + LineNum);
            }