c# 读取并写入 txt文档 前三行

读取并写入

//read and write before 3 line
                string oneLine_data = newsReader.ReadLine();
                Console.WriteLine(oneLine_data);
                outputWriter.Write(oneLine_data); 
                outputWriter.WriteLine("");
                int current_line = 1;
                while (oneLine_data != null && current_line < 3)
                {
                    oneLine_data = newsReader.ReadLine();
                    Console.WriteLine(oneLine_data);
                    outputWriter.WriteLine(oneLine_data);
                    current_line++;
                }
                outputWriter.WriteLine("");
                //end

读取前三行

//read before 3 line
            string oneLine_data = newsReader.ReadLine();
            Console.WriteLine(oneLine_data);
            int