C#.Net 遍历文件夹（文件&目录），并把所有文件写到txt中

privat void GetAllFiles(string path,StringCollection tion)
{
DirectoryInfo dir=new DirectoryInfo(path);
foreach(FileInfo file in dir.GetFiles(*))//设置文件类型
{
tion.Add(file.FullName); //网StringCollection里面添加文件名

}
foreach(DirectoryInfo subDire in dir.GetDirectorys(*) ) //操作子目录

{
GetAllFiles(subDire.FullName,tion); //递归
}
}

private void WriteTxt(string path,StringCollection fileNames)
{
using(StreamWriter sw=new StreamWriter(path))
{
foreach(string fileName in fileNames)
{
sw.WriteLine(fileName);
}
}
}