1、求一个 ASP.NET C# 下载文件的函数，参数是要下载的文件在服务器中的路径，一调用此函数，客
不同浏览器写法还不一样
public static string Get_NewFileName(string filename)
{
string userAgent = HttpContext.Current.Request.UserAgent;
string new_filename = HttpUtility.UrlEncode(filename);
string rtn = "filename="" + new_filename + """;
if (userAgent != null)
{
userAgent = userAgent.ToLower();
if (userAgent.IndexOf("opera") != -1)
{
rtn = "filename*=UTF-8''" + new_filename;
}
else if (userAgent.IndexOf("mozilla") != -1)
{
rtn = "filename*=UTF-8''" + new_filename;
}
}
return rtn;
}
public static void DownFile(string filename)
{
Stream iStream = null;
byte[] buffer = new byte[10000];
int length;
long dataToRead;
iStream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
dataToRead = iStream.Length;
HttpContext.Current.Response.ContentType = "application/octet-stream";
string filename2;
string[] filename3 = ShareProject.Char.CharHandle.splitfun(filename, ".");
filename2 = "下载文件名" + "." + filename3[filename3.Length - 1];//下载时显示的名称
filename2 = Get_NewFileName(filename2);
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; " + filename2);
while (dataToRead > 0)
{
if (HttpContext.Current.Response.IsClientConnected)
{
length = iStream.Read(buffer, 0, 10000);
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
HttpContext.Current.Response.Flush();
buffer = new Byte[10000];
dataToRead = dataToRead - length;
}
else
{
dataToRead = -1;
}
}
iStream.Close();
iStream.Dispose();
HttpContext.Current.Response.End();
}
2、C#下载服务器指定文件夹下的所有文件
这个文件夹要有目录浏览的权限（或者必须有一个文件来指明所有的文件名），否则单纯的只知道一个地址当然是不可能下载的
3、用c#怎样从服务器下载文件，并保存为相应的类型
C#从服务器下载文件可以使用下面4个方法：TransmitFile、WriteFile、WriteFile和流方式下载文件，并保存为相应类型，方法如下：
1、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);
}
2、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();
}
3、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();
}
}
4、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();
}
4、C#从服务器打包下载文件
学习学习！
5、asp.net 如何实现将服务器上的文件下载到本地？
给你提供一点代码：
string fileURL = this.Server.MapPath("你要下载的文件路径");//文件路径，可用相对路径
FileInfo fileInfo = new FileInfo(fileURL);
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" +
Server.UrlEncode(fileInfo.Name.ToString()));//文件名
Response.AddHeader("content-length", fileInfo.Length.ToString());//文件大小
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.Default;
Response.WriteFile(fileURL);
6、ASP.NET如何下载服务器端的文件？比如下载网站根目录下的“1.txt”到桌面上，求详细代码
给你提供一点代码：
string fileURL = this.Server.MapPath("你要下载的文件路径");//文件路径，可用相对路径
FileInfo fileInfo = new FileInfo(fileURL);
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" + Server.UrlEncode(fileInfo.Name.ToString()));//文件名
Response.AddHeader("content-length", fileInfo.Length.ToString());//文件大小
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.Default;
Response.WriteFile(fileURL);
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7、C#从服务器上下载一个rar文件 怎么弄
看你的是ftp下载还是http下载？
FTP方式下载参考：
http://www.cnblogs.com/wang726zq/archive/2012/07/30/ftp.html
Http方式下载参考：
http://.baidu.com/link?url=wNBSRQG_vNwTfbxCUr_
8、asp.net如何实现将服务器上的文件下载到本地？
给你提供一点代码：
string fileURL = this.Server.MapPath("你要下载的文件路径");//文件路径，可用相对路径
FileInfo fileInfo = new FileInfo(fileURL);
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" + Server.UrlEncode(fileInfo.Name.ToString()));//文件名
Response.AddHeader("content-length", fileInfo.Length.ToString());//文件大小
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.Default;
Response.WriteFile(fileURL);