判断图片上传

 1 PRivate bool IsImage(string filePath) 2         { 3             Image image; 4             try 5             { 6                 image = Image.FromFile(filePath); 7                 image.Dispose(); 8                 return true; 9             }10             catch (Exception ex)11             {12                 return false;13             }14         }

    /// <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;        }    }