using System;
using System.IO;namespace IO操作
{class Program{static void Main(string[] args){using(StreamWriter w=File.AppendText("IO.txt")){TextIn("Hello GeoStorm", w);TextIn("Hello World",w);w.Close();}}public static void TextIn(string content, TextWriter w){w.Write("\r\n message:");w.WriteLine("{0}",content);w.Flush();}}
}