NET可用的下载方式（包含下载统计）：

下载的同时记录下载次数，不能用超链接直接下载，而应该用超链接跳到一个aspx中间页 面，并在这个页面的CS文件中Page_Load方法中，用Response.Redirect("url");指向下载的文件。这样点击下载后，客户看 到的一直是下载页面，不会看到中间页面。

1、<a href="mp3/生命的希望不再失落.mp3">下载</a>

2、Response.Redirect("mp3/生命的希望不再失落.mp3");

3、Server.Transfer("mp3/生命的希望不再失落.mp3");

4、流方式：网上的四种方法如下

//TransmitFile实现下载    
protectedvoid 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    
protectedvoid 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    
protectedvoid 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)   
        {   
            constlong 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 =newbyte[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    
protectedvoid 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 =newbyte[(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();   
    }   
  
    
  
//----------------------------------------------------------   
  
    
  
    
  
publicvoid DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )   
{   
  
　　WebForm.Response.ClearHeaders();   
　　WebForm.Response.Clear();   
　　WebForm.Response.Expires =0;   
　　WebForm.Response.Buffer =true;   
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");   
　　//'文件名称   
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");   
　　WebForm.Response.ContentType ="Application/octet-stream";   
　　//'文件内容   
　　WebForm.Response.Write(FileBody);//-----------   
    WebForm.Response.End();   
}   
  
  
//上面这段代码是下载一个动态产生的文本文件，若这个文件已经存在于服务器端的实体路径，则可以通过下面的函数：   
  
publicvoid DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )   
{   
　　WebForm.Response.ClearHeaders();   
　　WebForm.Response.Clear();   
　　WebForm.Response.Expires =0;   
    WebForm.Response.Buffer =true;   
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");   
　　//文件名称   
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+ System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );   
　　WebForm.Response.ContentType ="Application/octet-stream";   
　　//文件内容   
　　WebForm.Response.Write(System.IO.File.ReadAllBytes(FilePath));//---------   
　　WebForm.Response.End();   
}