C#读写txt文件

class Program
    {
        static void Main(string[] args)
        {
            string path ="test.txt";
            Write(path);
            Console.WriteLine(Read(path));
            Console.ReadKey();
        }

        public static void Write(string path)
        {
            using (FileStream fs = new FileStream(path, FileMode.Append))
            {
                StreamWriter sw = new StreamWriter(fs);
                sw.WriteLine("Hello World!!!!");
                sw.WriteLine("Hello World!!!!");
                sw.Flush();
                Console.WriteLine("写入成功！");
            }
        }

        public static string Read(string path)
        {
            StreamReader sr = new StreamReader(path, Encoding.Default);
            return sr.ReadToEnd();
        }
    }