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C#下载文件(TransmitFile/WriteFile/流方式)实例介绍

时间:2019-10-23 13:37     来源/作者:C#教程网

代码如下:


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) 

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) 

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(); 

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