文件下载

方法实体

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;charset=gbk";

            _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;

}

 

方法调用

 

ExportExcel excel = new ExportExcel();

string fileName = excel.Export(dt, "项目统计", DataName);

string path = Request.PhysicalApplicationPath + "Excel\\" + fileName + ".xls";

DownFile.ResponseFile(Page.Request, Page.Response, fileName + ".xls", path, 1024000);