学步园

       private void button1_Click(object sender, EventArgs e)
        {
            FindFile(@"/SDMMC", "*.mp3");//调用就可以的了
           
           
        }
        private void FindFile(string FoldPath,string filter)//要查找的文件夹和文件类型
        {
            DirectoryInfo thefolder = new DirectoryInfo(FoldPath);
            foreach (DirectoryInfo nextfolder in thefolder.GetDirectories())
            {
                FindFile(nextfolder.FullName,filter);
            }
            foreach (FileInfo nextfile in thefolder.GetFiles(filter))
            {
                this.listBox1.Items.Add(nextfile.FullName);
            }         
           
        }

就是遍历。