實(shí)現(xiàn)

/// <summary>
        /// 獲取路徑下所有文件以及子文件夾中文件
        /// </summary>
        /// <param name="path">全路徑根目錄</param>
        /// <param name="FileList">存放所有文件的全路徑</param>
        /// <param name="RelativePath"></param>
        /// <returns></returns>
        public static void GetFile(string path, string fileName, ref string smallDir)
        {
            DirectoryInfo dir = new DirectoryInfo(path);
            FileInfo[] fil = dir.GetFiles();
            DirectoryInfo[] dii = dir.GetDirectories();
            foreach (FileInfo f in fil)
            {
                string name =  Path.GetFileName(f.FullName.ToString());
                //Console.WriteLine(name);
                if (name.Contains(fileName)) {
                    Console.WriteLine(Path.GetDirectoryName(f.FullName));
                    string[] temp = Path.GetDirectoryName(f.FullName).Split('\\');
                    smallDir = temp[temp.Length - 1];
                    return;
                }
            }
            //獲取子文件夾內(nèi)的文件列表，遞歸遍歷
            foreach (DirectoryInfo d in dii)
            {
                if (smallDir == "")
                    GetFile(d.FullName, fileName, ref smallDir);
            }
            //return smallDir;
        }

調(diào)用

            string path = "路徑";
            string smallDir = "";
            string fileName = "你想要搜索的文件名";
            GetFile(path, fileName,ref smallDir);
            MessageBox.Show(smallDir);