using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;namespace Reform.FolderManage.Cls{ public class FileHelper { ////// 图片类型头部编码 /// public enum ImgExtension { JPG = 255216, GIF = 7173, BMP = 6677, PNG = 13780 } ////// 文件类型的判断 /// /// 文件 /// 文件类型 ///public static bool IsRealFile(string fileName, string fileType) { string fileExt = Path.GetExtension(fileName).ToLower();//取得文件后缀名 if (fileType == "图片") { if (IsAllowedExtension(fileName)) return true; } if (fileType == "视频") { List list = new List (); list.Add(".flv"); list.Add(".wmv"); list.Add(".avi"); list.Add(".3gp"); Path.GetExtension(fileName).ToLower();//取得文件后缀名 return IsExistEx(list, fileExt); } if (fileType == "文档") { List list = new List (); list.Add(".doc"); list.Add(".pdf"); return IsExistEx(list, fileExt); } return false; } /// /// 判断文件后缀 /// private static bool IsExistEx(Listlist, string fileExt) { if (list.Contains(fileExt))//在列表中 { return true; } return false; } #region 图片处理 /// /// 是否是真实的图片类型 /// public static bool IsAllowedExtension(string imgFileName) { System.IO.FileStream fs = new System.IO.FileStream(imgFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read); System.IO.BinaryReader br = new System.IO.BinaryReader(fs); string fileclass = ""; byte buffer; try { buffer = br.ReadByte(); fileclass = buffer.ToString(); buffer = br.ReadByte(); fileclass += buffer.ToString(); } catch { } br.Close(); fs.Close(); ImgExtension[] fileEx = { ImgExtension.BMP, ImgExtension.GIF, ImgExtension.JPG, ImgExtension.PNG }; foreach (ImgExtension fe in fileEx) { if (Int32.Parse(fileclass) == (int)fe) return true; } return false; } #endregion }}