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

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

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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