• C#下载功能代码


    using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using System.IO; 
    
     
    
    public partial class _Default : System.Web.UI.Page 
    {
     protected void Page_Load(object sender, EventArgs e)
     {
    
     }
    
     //TransmitFile实现下载
     protected void Button1_Click(object sender, EventArgs e)
     {
     /*
     微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
     下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
     代码如下:
     */
    
     Response.ContentType = "application/x-zip-compressed";
     Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
     string filename = Server.MapPath("DownLoad/z.zip");
     Response.TransmitFile(filename);
     }
    
     //WriteFile实现下载
     protected void Button2_Click(object sender, EventArgs e)
     {
     /*
     using System.IO;
    
     */
    
     string fileName ="asd.txt";//客户端保存的文件名
     string filePath=Server.MapPath("DownLoad/aaa.txt");//路径
    
     FileInfo fileInfo = new FileInfo(filePath);
     Response.Clear();
     Response.ClearContent();
     Response.ClearHeaders();
     Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
     Response.AddHeader("Content-Length", fileInfo.Length.ToString());
     Response.AddHeader("Content-Transfer-Encoding", "binary");
     Response.ContentType = "application/octet-stream";
     Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
     Response.WriteFile(fileInfo.FullName);
     Response.Flush();
     Response.End();
     }
    
     //WriteFile分块下载
     protected void Button3_Click(object sender, EventArgs e)
     {
    
     string fileName = "aaa.txt";//客户端保存的文件名
     string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
    
     System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
    
     if (fileInfo.Exists == true)
     {
     const long ChunkSize = 102400;//100K 每次读取文件,只读取100K,这样可以缓解服务器的压力
     byte[] buffer = new byte[ChunkSize];
    
     Response.Clear();
     System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
     long dataLengthToRead = iStream.Length;//获取下载的文件总大小
     Response.ContentType = "application/octet-stream";
     Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
     while (dataLengthToRead > 0 && Response.IsClientConnected)
     {
     int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
     Response.OutputStream.Write(buffer, 0, lengthRead);
     Response.Flush();
     dataLengthToRead = dataLengthToRead - lengthRead;
     }
     Response.Close();
     }
     }
    
     //流方式下载
     protected void Button4_Click(object sender, EventArgs e)
     {
     string fileName = "aaa.txt";//客户端保存的文件名
     string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
    
     //以字符流的形式下载文件
     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";
     //通知浏览器下载文件而不是打开
     Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
     Response.BinaryWrite(bytes);
     Response.Flush();
     Response.End();
    
     }
    }

     使用GridView等控件导出Excel

    public void outExcel()
            {
                string name = returnName();
    
                string style = @"<style>.text{mso-number-format:\@;}</style>";
    
                Response.ClearContent();
    
                Response.Buffer = true;
                Response.Charset = "gb2312";
                Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
    
                Response.AddHeader("content-disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(name, System.Text.Encoding.UTF8) + ".xls");
    
                Response.ContentType = "application/excel";
    
                StringWriter sw = new StringWriter();
    
                HtmlTextWriter htw = new HtmlTextWriter(sw);
    
                GridView1.RenderControl(htw);
    
                Response.Write(style);
    
                Response.Write(sw.ToString());
    
                Response.End();
            }
    
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  • 原文地址:https://www.cnblogs.com/lingyuan/p/1909761.html
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