C#创建文本文件，写入数据，输出数据

using System;
using System.IO;

class predefinedTypes
{
public static void Main()
{
// 在当前目录创建一个文件myfile.txt，对该文件具有读写权限
FileStream fsMyfile = new FileStream("myfile.txt" , FileMode.Create , FileAccess.ReadWrite);
//写入
StreamWriter swMyfile = new StreamWriter(fsMyfile);
string wd=Console.ReadLine();
swMyfile.WriteLine(wd);
swMyfile.Flush();

//读出
StreamReader srMyfile= new StreamReader(fsMyfile);
srMyfile.BaseStream.Seek(0, SeekOrigin.Begin);
string  rl=srMyfile.ReadLine();

Console.WriteLine(rl);

}
}