.net 下载图片

最近boss让写一个二维码的生成器,但是二维码生成后用户如果想下载二维码,这就促使我写l了 下载功能,小弟自认为技术不咋样,是个彻头彻尾的码农,本先是想用js来实现功能,但是查找了好多资料也没能实现,最后还是想到了后台代码。。。

好了废话就不多说了下面看代码吧....

  首先在前台页面加上一个

<asp:LinkButton runat="server" onclick="Unnamed1_Click">LinkButton</asp:LinkButton>

 然后就是他的后台代码了

protected void Unnamed1_Click(object sender, EventArgs e)
        {
            string s_fileName = "/img/1.jpg"; //图片路径
            HttpContext.Current.Response.ContentType = "application/ms-download"; //声明方式
            string s_path = HttpContext.Current.Server.MapPath("~/") + s_fileName; 找到文件路径
            System.IO.FileInfo file = new System.IO.FileInfo(s_path); //打开文件位置
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream"); //声明方式
            HttpContext.Current.Response.Charset = "utf-8"; //声明方式
            HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8)); 
            HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
            HttpContext.Current.Response.WriteFile(file.FullName); 
            HttpContext.Current.Response.Flush(); 
            HttpContext.Current.Response.Clear(); 
            HttpContext.Current.Response.End(); 
        }

  

原文地址:https://www.cnblogs.com/dandanwozhishidan/p/3597305.html