C#判断上传文件是否是图片以防止木马上传的方法

/// <summary>/// 判断文件是否为图片/// </summary>/// <param name="path">文件的完整路径</param>/// <returns>返回结果</returns>public Boolean IsImage(string path){try{ System.Drawing.Image img = System.Drawing.Image.FromFile(path); return true;}catch (Exception e){ return false;}}

/// <summary>/// 根据文件头判断上传的文件类型/// </summary>/// <param name="filePath">filePath是文件的完整路径 </param>/// <returns>返回true或false</returns>private bool IsPicture(string filePath){try{ FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read); BinaryReader reader = new BinaryReader(fs); string fileClass; byte buffer; buffer = reader.ReadByte(); fileClass = buffer.ToString(); buffer = reader.ReadByte(); fileClass += buffer.ToString(); reader.Close(); fs.Close(); if (fileClass == "255216" || fileClass == "7173" || fileClass == "13780" || fileClass == "6677") //255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar  { return true; } else { return false; }}catch{ return false;}}