獲取磁盤D下所有txt文件路徑，並輸入到C:\path.txt文件

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
namespace Test

{

class PRogram
    {
      
        private static void WriteFilePath(Stream filestream)
        {
            StreamWriter sw = new StreamWriter(filestream);
            DirectoryInfo dicInfo = new DirectoryInfo(@"D:\");
            FileInfo[] textFiles = dicInfo.GetFiles("*.txt", SearchOption.AllDirectorIEs);
            foreach (FileInfo fileInfo in textFiles)
            {
                sw.WriteLine(fileInfo.FullName);
            }
            sw.Close();
            filestream.Close();
            Console.Read();
        }
        static void Main(string[] args)
        {
            FileStream fs;
            string strFilePath = @"C:\path.txt";
            if (File.Exists(strFilePath))
            {
                fs = new FileStream(strFilePath, FileMode.Open, FileAccess.Write);
                WriteFilePath(fs);
            }
            else
            {
                fs = new FileStream(strFilePath, FileMode.Create, FileAccess.Write);
                WriteFilePath(fs);
            }
        }
    }

}