C# 使用WebClient 取服务器文件转换为 Stream

根据服务文件地址保存到本地指定文件目录

#region 获取pdf文件
        /// <summary>
        /// 获取pdf文件
        /// </summary>
        /// <param name="serverUrl">服务器文件地址</param>
        /// <param name="localUrl">本地文件地址</param>
        public static void GetPdf(string serverUrl, string localUrl)
        {
            System.Net.WebClient myWebClient = new System.Net.WebClient();
            myWebClient.DownloadFile(serverUrl, localUrl);
        }
        #endregion

 

根据本地文件路径将文件转换为Stream

  #region 将文件转换为 Stream
        /// <summary>
        /// 将文件转换为 Stream
        /// </summary>
        /// <param name="fileName">文件路径</param>
        /// <returns></returns>
        public static Stream FileToStream(string fileName)
        {
            // 打开文件
            FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
            // 读取文件的 byte[]
            byte[] bytes = new byte[fileStream.Length];
            fileStream.Read(bytes, 0, bytes.Length);
            fileStream.Close();
            // 把 byte[] 转换成 Stream
            Stream stream = new MemoryStream(bytes);

            return stream;
        }
        #endregion

 

根据服务文件地址将服务器文件转化为Stream

#region  将url文件转换为 Stream
        /// <summary>
        /// 将url文件转换为 Stream
        /// </summary>
        /// <param name="url">服务器文件地址</param>
        /// <returns></returns>
        public static Stream UrlToStream(string url)
        {
            WebClient wc = new WebClient();
            byte[] bytes = wc.DownloadData(url);
            //下载到字节数组
            Stream stream = new MemoryStream(bytes);

            return stream;
        }
        #endregion