貼代碼了，這裏使用的是C#控制臺輸出文件名到記事本中，文件名使用逗號隔開：

using System;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        public static string FileName = "";

        public static void Main(string[] args)
        {
            bool isContinute = true;
            WriteMessage("結束程序請輸入1
 
");
            WriteMessage("請輸入要獲取文件名的路徑：");
            string path = Console.ReadLine();
            do
            {
                if (string.IsNullOrEmpty(path))
                {
                    WriteMessage("路徑不存在！請重新輸入");
                }
                else
                {
                    DirectoryInfo dir 
 
= new DirectoryInfo(path);
                    if (dir.Exists == false)
                    {
                        WriteMessage("路徑不存在！請重新輸入");
                    }
                    else
                    {
                        FileName = "";
                        GetChildDicsName(dir);
                        WriteMessage(FileName);
                        Console.WriteLine(
 
"獲取該路徑下文件名成功！你可以繼續輸入新的路徑");
                    }
                }
                path = Console.ReadLine();
                isContinute = path != "1";
            } while (isContinute);
        }

        public static DirectoryInfo[] GetChildDicsName(DirectoryInfo dir)
        {
            FileInfo[] fileArray = dir.GetFiles();
            DirectoryInfo[] childDirs = dir.GetDirectories();

            foreach (FileInfo file in fileArray)
            {
                FileName += file.Name + ",";
            }
            if (childDirs.Length > 0)
            {
                foreach (DirectoryInfo dirChild in childDirs)
                {
                    GetChildDicsName(dirChild);
                }
            }
            return childDirs;
        }

        public static void WriteMessage(string message)
        {
            Console.WriteLine(message);
            //File.Create(@"C:\Users\Public\Desktop\test.txt");
            FileStream fs = File.Open(@"C:\Users\Public\Desktop\test.txt", FileMode.Append);
            StreamWriter sw = new StreamWriter(fs);
            sw.WriteLine(message);  //這裏是寫入的內容
            sw.Close();
            fs.Close();
        }
    }
}

控制臺信息截圖：

C#獲取某一路徑下的所有文件名信息（包括子文件夾）