.net下載文件的方法

最近做項目遇到文件下載的問題，原本采用的是直接用一個href鏈接到需要下載的文件來處理這個問題，后來發現，如果文件是一個圖片，瀏覽器會自動打開圖片而不是下載，需要用戶右擊另存為才可以下載，很不友好，后來上網找了一個a標簽的download屬性，經測試，谷歌瀏覽器支持下載，但是IE並不支持這個屬性，懶得去做那些兼容的操作了，在后台寫了一個下載的方法，直接前台調用就OK

• asp.net的下載方法

/// <summary>
       ///字符流下載方法
       /// </summary>
       /// <param name="fileName">下載文件生成的名稱</param>
       /// <param name="fPath">下載文件路徑</param>
       /// <returns></returns>
        public void DownloadFile(string fileName, string fPath)
        {
            string filePath = Server.MapPath(fPath);//路徑
            //以字符流的形式下載文件
            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[(int)fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();
            Response.ContentType = "application/octet-stream";
            //通知瀏覽器下載文件而不是打開
            Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
            Response.BinaryWrite(bytes);
            Response.Flush();
            Response.End();
        }

•  asp.net MVC 的下載方法

/// <summary>
        /// 下載文件的方法
        /// </summary>
        /// <param name="path">文件絕對路徑</param>
        /// <param name="fileName">客戶端接收的文件名</param>
        /// <returns></returns>
        public static HttpResponseMessage Download(string path, string fileName)
        {
            var stream = File.OpenRead(path);
            HttpResponseMessage httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK);
            try
            {
                httpResponseMessage.Content = new StreamContent(stream);
                httpResponseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                if (!string.IsNullOrEmpty(fileName))
                {
                    httpResponseMessage.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
                    {
                        FileName = HttpUtility.UrlEncode(fileName, Encoding.UTF8),
                    };
                }
                return httpResponseMessage;
            }
            catch
            {
                stream.Dispose();
                httpResponseMessage.Dispose();
                throw;
            }
        }

 

• .net Core 的下載方法

        /// <summary>
        /// 下載文件
        /// </summary>
        /// <param name="path">文件絕對路徑</param>
        /// <returns></returns>
        public ActionResult<dynamic> DownloadFiles(string path)
        {
            return File(new FileInfo(path).OpenRead(), "application/vnd.android.package-archive", "自定義的文件名");
        }