c#读写文件

        static void Main(string[] args)
        {
            //这个两上便利类，可以读写文本文件
            using (StreamWriter writer = new StreamWriter(@"c:\exercise\abc.txt",true))
            {
                writer.WriteLine("这个句子是我加上去的"); 
            }
            //读文本文件
            using (StreamReader reader = new StreamReader(@"c:\exercise\abc.txt"))
            {
                while (reader.EndOfStream == false)
                {
                    Console.WriteLine(reader.ReadLine());
                }
            }
            Console.ReadKey();
        }