DownLoadFile - FileHandler
public class FileHandler { public static bool DownLoadFile(string path, string fileName) { bool result = false; if (!string.IsNullOrEmpty(path)) { if (path.StartsWith("http") || path.StartsWith("https")) { result = InternetDownload(path, fileName); } else { result = LocalDownload(path, fileName); } } return result; } private static bool LocalDownload(string path, string fileName) { bool result = false; //Physical path "D:\InvoicePDF\" string filePath = path + fileName; if (File.Exists(filePath)) { result = true; } else { try { //Relative path "~/InvoicePDF/" filePath = HttpContext.Current.Server.MapPath(filePath); if (File.Exists(filePath)) { result = true; } } catch { result = false; } } if (result) { try { //string filePath = HttpContext.Current.Server.MapPath(path + fileName); FileInfo fileInfo = new FileInfo(filePath); HttpContext.Current.Response.Clear(); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ClearHeaders(); HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString()); HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary"); HttpContext.Current.Response.ContentType = "application/octet-stream"; HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8"); HttpContext.Current.Response.WriteFile(fileInfo.FullName); HttpContext.Current.Response.Flush(); } catch (Exception e) { } finally { HttpContext.Current.Response.End(); } } return result; } private static bool InternetDownload(string path, string fileName) { string url = path + fileName; if (UrlIsExist(url)) { ResponseRedirect.Redirect(HttpContext.Current.Response, url, "_blank", ""); //System.Web.HttpContext.Current.Response.Redirect(url,false); } return false;//Never use default behavior } private static bool UrlIsExist(string url) { System.Uri u = null; try { u = new Uri(url); } catch { return false; } bool isExist = false; System.Net.HttpWebRequest r = System.Net.HttpWebRequest.Create(u) as System.Net.HttpWebRequest; r.Method = "HEAD"; try { System.Net.HttpWebResponse s = r.GetResponse() as System.Net.HttpWebResponse; if (s.StatusCode == System.Net.HttpStatusCode.OK) { isExist = true; } } catch (System.Net.WebException x) { try { isExist = ((x.Response as System.Net.HttpWebResponse).StatusCode != System.Net.HttpStatusCode.NotFound); } catch { isExist = (x.Status == System.Net.WebExceptionStatus.Success); } } return isExist; } }
本文来自博客园,作者:VipSoft 转载请注明原文链接:https://www.cnblogs.com/vipsoft/p/3627709.html
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