文件下载

来源：互联网发布：淘宝双11交易数据编辑：程序博客网时间：2024/06/05 03:36
//引用命名空间using System.IO;using System.Text;using System.Web;// 文件下载public static bool DownloadFile(string path)        {            HttpRequest request = HttpContext.Current.Request;            HttpResponse response = HttpContext.Current.Response;            try            {                FileInfo info = new FileInfo(HttpContext.Current.Server.MapPath(path));                if (info.Exists)                {                    string name = info.Name;                    string extension = info.Extension;                    name = name.Substring(0, name.Length - extension.Length);                    while (HttpUtility.UrlEncode(name + extension, Encoding.UTF8).Length > 0x9c)                    {                        name = name.Substring(0, name.Length - 1);                    }                    name = HttpUtility.UrlEncode(name + extension, Encoding.UTF8);                    response.Clear();                    if (info.Length < 0xfa000L)                    {                        response.ContentType = "application/octet-stream";                        response.AddHeader("Content-Disposition", "attachment;filename=" + name);                        response.WriteFile(info.FullName);                    }                    else                    {                        FileStream input = new FileStream(HttpContext.Current.Server.MapPath(path), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);                        BinaryReader reader = new BinaryReader(input);                        try                        {                            long length = input.Length;                            long num2 = 0L;                            int count = 0x2800;                            if (request.Headers["Range"] != null)                            {                                response.StatusCode = 0xce;                                num2 = Convert.ToInt64(request.Headers["Range"].Split(new char[] { '=', '-' })[1]);                            }                            response.AddHeader("Content-Length", (length - num2).ToString());                            if (num2 != 0L)                            {                                response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", num2, length - 1L, length));                            }                            response.ContentType = "application/octet-stream";                            response.AddHeader("Content-Disposition", "attachment;filename=" + name);                            reader.BaseStream.Seek(num2, SeekOrigin.Begin);                            int num4 = ((int)Math.Floor((double)(((double)(length - num2)) / ((double)count)))) + 1;                            for (int i = 0; i < num4; i++)                            {                                if (response.IsClientConnected)                                {                                    response.BinaryWrite(reader.ReadBytes(count));                                    response.Flush();                                }                                else                                {                                    i = num4;                                }                            }                        }                        catch                        {                            return false;                        }                        finally                        {                            reader.Close();                            input.Close();                        }                    }                }            }            catch (Exception)            {                return false;            }            return true;        }
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