使用StreamReader与StreamWriter进行文本文件读写

namespace filetest

{

    class FileUtil

    {

        public static void WriteFile(string file)

        {

            using (FileStream fs = new FileStream(file,FileMode.Append))

            using (StreamWriter sw = new StreamWriter(fs))

            {

                sw.WriteLine("Hello,this is a StreamWriter test!");

            }

            



        }



        public static void ReadFile(string file)

        {

            StringBuilder sb = new StringBuilder();

            using(FileStream fs = new FileStream(file, FileMode.Open))

            using(StreamReader sr = new StreamReader(fs))

            {

                while (!sr.EndOfStream)

                {

                    sb.Append(sr.ReadLine());

                }

            }

            Console.WriteLine(sb.ToString());

        }

    }

}