ASP.NET文件下载避免使用WriteFile方法

在你的Page_Load中添加这样的代码:


 Page.Response.Clear();


 bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称", @"源文件路径", 1024000);


 if (!success)


     Response.Write("下载文件出错！");


Page.Response.End();

文件下载函数代码为:


public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)




    

{


        try




        

{


            FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);


            BinaryReader br = new BinaryReader(myFile);


            try




            

{


                _Response.AddHeader("Accept-Ranges", "bytes");


                _Response.Buffer = false;


                long fileLength = myFile.Length;


                long startBytes = 0;


     


                double pack = 10240; //10K bytes


                //int sleep = 200;   //每秒5次   即5*10K bytes每秒


                int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;


                if (_Request.Headers["Range"] != null)




                

{


                    _Response.StatusCode = 206;




                    string[] range = _Request.Headers["Range"].Split(new char[] 

{'=', '-'});


                    startBytes = Convert.ToInt64(range[1]);


                }


                _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());


                if (startBytes != 0)




                

{


                    //Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));


                }


                _Response.AddHeader("Connection", "Keep-Alive");


                _Response.ContentType = "application/octet-stream";


                _Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );


             


                br.BaseStream.Seek(startBytes, SeekOrigin.Begin);


                int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;




                for (int i = 0; i < maxCount; i++)




                

{


                    if (_Response.IsClientConnected)




                    

{


                        _Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString())));


                        Thread.Sleep(sleep);


                    }


                    else




                    

{


                        i=maxCount; 


                    }


                }


            }


            catch




            

{


             return false;


            }


            finally




            

{


                br.Close();




                myFile.Close();


            }


        }


        catch




        

{


            return false;


        }


        return true;


    }

这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.