平时用的公共类

        /// <summary>
        /// 下载网络图片到指定磁盘
        /// </summary>
        /// <param name="FileFullPath"></param>
        /// <param name="To"></param>
        public static void DownLoadFilesToDir(string FileFullPath,string To)
        {
            WebRequest request = WebRequest.Create(FileFullPath);
            WebResponse response = request.GetResponse();
            Stream reader = response.GetResponseStream();
            FileStream writer = new FileStream(To,FileMode.OpenOrCreate,FileAccess.Write);
            byte[] buff = new byte[512];
            int c = 0;
            while ((c = reader.Read(buff, 0, buff.Length)) > 0)
            {
                writer.Write(buff,0,c);
            }
            writer.Close();
            writer.Dispose();
            reader.Close();
            reader.Dispose();
            response.Close();
        }