C#下载图片，用户选择保存路径

Html代码

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

     <title></title>

 </head>

 <body>

     <a href="ImgDownloadHandler.ashx">下载</a>

     <img src="http://10.1.18.59/CenterPointService/RainfallCenterTemp/20180319155952/20170601__20170930.png"

         alt="RainfallCenter" id="RainfallCenter" />

 </body>

 </html>

C#一般处理程序代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI.MobileControls;

using System.Drawing;

using System.IO;

using System.Net;

namespace WebApplication1

{

    /// <summary>

    /// ImgDownloadHandler 的摘要说明

    /// </summary>

    public class ImgDownloadHandler : IHttpHandler

    {

        public void ProcessRequest(HttpContext context)

        {

            #region action 2 可以导出图片

            Stream stream = null;

            string UrlImg = "http://10.1.18.59/CenterPointService/RainfallCenterTemp/20180319155952/20170601__20170930.png";

            WebClient webClient = new WebClient();

            webClient.Credentials = CredentialCache.DefaultCredentials;

            //以数组的形式下载指定文件

            byte[] byteData = webClient.DownloadData(UrlImg);

            stream = BytesToStream(byteData);

            string fileName = "20170601__20170930.png";//客户端保存的文件名

            context.Response.ContentType = "application/octet-stream";

            //通知浏览器下载文件而不是打开

            context.Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));

            context.Response.BinaryWrite(byteData);

            context.Response.Flush();

            context.Response.End();

            #endregion

        }

        /// <summary>

        /// 将二进制转化为数据流

        /// </summary>

        /// <param name="bytes">二进制数组</param>

        /// <returns></returns>

        public Stream BytesToStream(byte[] bytes)

        {

            Stream stream = new MemoryStream(bytes);

            return stream;

        }

        /// <summary>

        /// 将流转化为二进制数组

        /// </summary>

        /// <param name="stream"></param>

        /// <returns></returns>

        public byte[] StreamToBytes(Stream stream)

        {

            byte[] bytes = new byte[stream.Length];

            stream.Read(bytes, , bytes.Length);

            // 设置当前流的位置为流的开始

            stream.Seek(, SeekOrigin.Begin);

            return bytes;

        }

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

}

巴特西

C#下载图片，用户选择保存路径

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