遍历文件夹，递归，并删除不同的文件

   /// <summary>
        /// 发现并删除文件，不删除本文件
        /// </summary>
        /// <param name="file">需要遍历的文件夹路径</param>
        /// <param name="FullName">当前的文件完整路径</param>
        /// <param name="FileName">当前文件的文件名</param>
        public void findAllFile(string file, string FullName, string FileName)
        {

            DirectoryInfo drInfo = new DirectoryInfo(file);
 
            FileInfo[] fi = drInfo.GetFiles();

            foreach (FileInfo f in fi)
            {

                if (f.FullName != FullName&&f.Name==FileName)
                {
                    File.Delete(FullName);
                }

            }

            //获取当前目录下所有子文件夹
            DirectoryInfo[] subDr = drInfo.GetDirectories();

            //遍历所有子文件夹
            foreach (DirectoryInfo subDir in drInfo.GetDirectories())
            {

                string subFile = subDir.FullName + @"";

                //递归
                findAllFile(subFile, FullName, FileName);


            }

        }