居然发现文件名编码后长度超过155就会不能正确显示和下载,最后只好找了这样一个折中的方法,截短了 下面是那里的代码 /// <summary> /// 下载附件。 /// </summary> /// <param name="fileName">文件名</param> /// <param name="path">文件路径</param> public static void DownLoadFileAttachment(string fileName , string path) { if (System.IO.File.Exists(path)) { try { fileName = fileName.Trim();
for (int i = 0 ; i < System.IO.Path.InvalidPathChars.Length ; i ++) { fileName = fileName.Trim().Replace(System.IO.Path.InvalidPathChars[i].ToString() , string.Empty); }
fileName = fileName.Replace(System.IO.Path.PathSeparator.ToString() , string.Empty); int maxLength = 155;
int length = HttpUtility.UrlEncode(fileName).Length; while (length > maxLength) { int index = fileName.LastIndexOf("."); if (index > 0) { fileName = fileName.Substring(0 , index - 1) + fileName.Substring(index); } else { fileName = fileName.Substring(0 , fileName.Length - 1); } length = HttpUtility.UrlEncode(fileName).Length; }
System.IO.FileInfo file = new System.IO.FileInfo(path); HttpContext.Current.Response.Clear(); HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName)); HttpContext.Current.Response.AppendHeader("Content-Length", file.Length.ToString()); HttpContext.Current.Response.ContentType = "application/octet-stream"; HttpContext.Current.Response.WriteFile(file.FullName); HttpContext.Current.Response.End(); } catch { } } else { HttpContext.Current.Response.Clear(); DisplayNoFileMessage(); HttpContext.Current.Response.End(); } } 
|