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.net 文件下载

        //TransmitFile实现下载

   protected void Button1_Click1(object sender, EventArgs e) 

        {

            string strFileName = "dd.ppt"; 

            Response.ContentType = "application/x-zip-compressed"; 

            //Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); 

            string filename = BLL.Config.PART_EM_UPLOAD_DOC + strFileName;  

            //BLL.Config.PART_EM_UPLOAD_DOC 为路径   ("D:/EMUploadDoc/") 

            Response.AddHeader("Content-Disposition", "attachment;filename=" +Server.UrlPathEncode(strFileName)); 

           //Server.UrlPathEncode()解决文件名的乱码问题. 

             

            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(); 

    } 

C#:  
///  
///   文件下载
///  
///  
private  void  FileDownload(string  FullFileName)
{
FileInfo  DownloadFile  =  new  FileInfo(FullFileName);  
Response.Clear();
Response.ClearHeaders();
Response.Buffer=false;
Response.ContentType= "application/octet-stream ";
Response.AppendHeader( "Content-Disposition ","attachment;filename= "  +HttpUtility.UrlEncode(DownloadFile.FullName,System.Text.Encoding.UTF8));
Response.AppendHeader( "Content-Length",DownloadFile.Length.ToString());
Response.WriteFile(DownloadFile.FullName);
Response.Flush();
Response.End();
}

文件读写
public Stream GetFileStream(stringfilename)     
       {  //文件地址         
           Uri fileUri = new Uri(filename,UriKind.Relative);    
           //保存          
           StreamResourceInfo info = new StreamResourceInfo(this.stream,null); 
           if (this.stream isSystem.IO.FileStream)          
           {           
               this.stream.Seek(0,SeekOrigin.Begin);         
           }          
           StreamResourceInfo stream =System.Windows.Application.GetResourceStream(info,fileUri);         
           if (stream != null)
           {             
               returnstream.Stream;   
           }          
           returnnull;     
       }
       public IEnumerable GetFileNamesInZip()
       {
           BinaryReader reader = new BinaryReader(stream);
           stream.Seek(0, SeekOrigin.Begin);
           string name = null;
           List names = new List();
           while (ParseFileHeader(reader, outname))       
           {
               names.Add(name);
           }
           return names;
       }
       private static bool ParseFileHeader(BinaryReader reader, out stringfilename)
       {
            filename =null;   
           if (reader.BaseStream.Position <reader.BaseStream.Length)  
           {
                filename =null;         
               if (reader.BaseStream.Position <reader.BaseStream.Length)  
                {
                   reader.BaseStream.Seek(2,SeekOrigin.Current);                
                   short genPurposeFlag =reader.ReadInt16();               
                   if (((((int)genPurposeFlag) & 0x08) !=0))   
                       return false;
                   reader.BaseStream.Seek(10,SeekOrigin.Current);    
                   int compressedSize = reader.ReadInt32();
                   int unCompressedSize = reader.ReadInt32(); 
                   short fileNameLenght = reader.ReadInt16();
                   short extraFieldLenght = reader.ReadInt16();
                   filename = newstring(reader.ReadChars(fileNameLenght));                
                   if (string.IsNullOrEmpty(filename))
                        returnfalse;             
                   reader.BaseStream.Seek(extraFieldLenght + compressedSize,SeekOrigin.Current); 

                  if (unCompressedSize ==0)            

                 return ParseFileHeader(reader, outfilename);                 
                        else            
                            return true;
                    }          
           }          
           returnfalse;      
       }

源地址:http://blog.sina.com.cn/s/blog_680942070101ahsq.html