nGallery源码分析(关于对xml反序列化的一点猜想)---比较菜：)

前段时间应bestcomy兄弟的，提议，我对nGallery一个开源的WEB电子相册项目(见http://www.ngallery.org)做了部分本地化的工作.

当时纯属偶然我修改了它的数据配置文件ngallery.config把

<?xml version="1.0"?>
<Configuration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

......

.....
</Configuration>
我把上面改为
<Configuration1 xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

......

.....
</Configuration1>

结果出在类Configuration中出现异常

using System;
using System.Web;
using System.IO;
using System.Xml.Serialization;

namespace nGallery.Lib
{
    
    
    RewriteType Enum#region RewriteType Enum


    public enum RewriteType
    {
        ById,
        ByName
    }


    #endregion

    
    /**//// <summary>
    /// <c>Configuration</c> provides an object that contains all
    /// the application configuration settings.
    /// </summary>
    [Serializable]
    public class Configuration
    {


        Private Members#region Private Members

        private static string _configurationFilePath = System.IO.Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory.Replace("/",System.IO.Path.DirectorySeparatorChar.ToString()),"data" + System.IO.Path.DirectorySeparatorChar + "ngallery.config"); 
        private static Configuration _currentConfiguration;
        private string _siteTitle;
        private string _siteSkin;
        private bool _enableComments;
        private bool _enableRatings;
        private bool _enableExif;
        private bool _enableStats;
        private string _sitePassword;
        private string _datastoreType;
        private string _connectionString;
        private string _adminUserName;
        private string _adminPassword;
        private string _adminFullName;
        private string _adminEmailAddress;
        private string _smtpServer;
        private string _commentType;
        private int _albumListImageHeight;
        private int _albumListImageWidth;
        private int _albumListImageQuality;
        private int _albumListRecordsPerPage;
        private int _albumListDescLength;
        private string _albumListPagingDisplayType;
        private bool _originalPictureWatermark;
        private int _pictureListImageHeight;
        private int _pictureListImageWidth;
        private bool _pictureListMaintainRatio;
        private int _pictureListImageQuality;
        private int _pictureDetailsImageHeight;
        private int _pictureDetailsImageWidth;
        private bool _pictureDetailsMaintainRatio;
        private int _pictureDetailsImageQuality;
        private bool _pictureDetailsWatermark;
        private int _pictureListRecordsPerPage;
        private int _pictureListColumnsPerPage;
        private string _pictureListPagingDisplayType;
        private int _pictureMaxHeight;
        private int _pictureMaxWidth;
        private string _adminDirectory;
        private string _dataDirectory;
        private string _templateDirectory;
        private string _photosDirectory;
        private bool _customErrorPageEnabled;
        private int _slideShowDelay;
        private int _slideShowImageHeight;
        private int _slideShowImageWidth;
        private int _slideShowImageQuality;
        private bool _slideShowWatermark;
        private int _summaryImageHeight;
        private int _summaryImageWidth;
        private bool _summaryMaintainRatio;
        private int _summaryImageQuality;
        private bool _summaryWatermark;
        private string _watermarkImage;
        private string _watermarkText;
        private Definitions.WatermarkType _watermarkType;
        private Definitions.WatermarkPosition _watermarkPosition;
        private string _characterSet;
        private string _exifProperties;
        private RewriteType _rewriteType;


        #endregion


        Constructor#region Constructor


        public Configuration()
        {
        }


        #endregion


        Public Properties#region Public Properties


        public RewriteType AlbumRewriting
        {
            get { return _rewriteType; }
            set { _rewriteType = value; }
        }

        public string CharacterSet
        {
            get { return _characterSet; }
            set { _characterSet = value; }
        }

        public string SiteTitle
        {
            get { return _siteTitle; }
            set { _siteTitle = value; }
        }

        public string SiteSkin
        {
            get { return _siteSkin; }
            set { _siteSkin = value; }
        }

        public bool EnableComments
        {
            get { return _enableComments; }
            set { _enableComments = value; }
        }

        public bool EnableRatings
        {
            get { return _enableRatings; }
            set { _enableRatings = value; }
        }

        public bool EnableExif
        {
            get { return _enableExif; }
            set { _enableExif = value; }
        }

        public bool EnableStats
        {
            get { return _enableStats; }
            set { _enableStats = value; }
        }

        public string SitePassword
        {
            get { return _sitePassword; }
            set { _sitePassword = value; }
        }

        public string DatastoreType
        {
            get { return _datastoreType; }
            set { _datastoreType = value; }
        }

        public string ConnectionString
        {
            get { return _connectionString; }
            set { _connectionString = value; }
        }

        public string AdminUserName
        {
            get { return _adminUserName; }
            set { _adminUserName = value; }
        }

        public string AdminPassword
        {
            get { return _adminPassword; }
            set { _adminPassword = value; }
        }

        public string AdminFullName
        {
            get { return _adminFullName; }
            set { _adminFullName = value; }
        }

        public string AdminEmailAddress
        {
            get { return _adminEmailAddress; }
            set { _adminEmailAddress = value; }
        }

        public string SmtpServer
        {
            get { return _smtpServer; }
            set { _smtpServer = value; }
        }

        public string CommentType
        {
            get { return _commentType; }
            set { _commentType = value; }
        }

        public int AlbumListImageHeight
        {
            get { return _albumListImageHeight; }
            set { _albumListImageHeight = value; }
        }

        public int AlbumListImageWidth
        {
            get { return _albumListImageWidth; }
            set { _albumListImageWidth = value; }
        }

        public int AlbumListImageQuality
        {
            get { return _albumListImageQuality; }
            set { if((value > 0) && (value <= 100)) _albumListImageQuality = value; }
        }

        public int AlbumListRecordsPerPage
        {
            get { return _albumListRecordsPerPage; }
            set { _albumListRecordsPerPage = value; }
        }

        public int AlbumListDescLength
        {
            get { return _albumListDescLength; }
            set { _albumListDescLength = value; }
        }

        public string AlbumListPagingDisplayType
        {
            get { return _albumListPagingDisplayType; }
            set { _albumListPagingDisplayType = value; }
        }

        public bool OriginalPictureWatermark
        {
            get { return _originalPictureWatermark; }
            set { _originalPictureWatermark = value; }
        }

        public int PictureListImageHeight
        {
            get { return _pictureListImageHeight; }
            set { _pictureListImageHeight = value; }
        }

        public int PictureListImageWidth
        {
            get { return _pictureListImageWidth; }
            set { _pictureListImageWidth = value; }
        }

        public bool PictureListMaintainRatio
        {
            get { return _pictureListMaintainRatio; }
            set { _pictureListMaintainRatio = value; }
        }

        public int PictureListImageQuality
        {
            get { return _pictureListImageQuality; }
            set { if((value > 0) && (value <= 100)) _pictureListImageQuality = value; }
        }

        public int PictureDetailsImageHeight
        {
            get { return _pictureDetailsImageHeight; }
            set { _pictureDetailsImageHeight = value; }
        }

        public int PictureDetailsImageWidth
        {
            get { return _pictureDetailsImageWidth; }
            set { _pictureDetailsImageWidth = value; }
        }

        public bool PictureDetailsMaintainRatio
        {
            get { return _pictureDetailsMaintainRatio; }
            set { _pictureDetailsMaintainRatio = value; }
        }

        public int PictureDetailsImageQuality
        {
            get { return _pictureDetailsImageQuality; }
            set { if((value > 0) && (value <= 100)) _pictureDetailsImageQuality = value; }
        }

        public bool PictureDetailsWatermark
        {
            get { return _pictureDetailsWatermark; }
            set { _pictureDetailsWatermark = value; }
        }

        public int PictureListRecordsPerPage
        {
            get { return _pictureListRecordsPerPage; }
            set { _pictureListRecordsPerPage = value; }
        }

        public int PictureListColumnsPerPage
        {
            get { return _pictureListColumnsPerPage; }
            set { _pictureListColumnsPerPage = value; }
        }

        public string PictureListPagingDisplayType
        {
            get { return _pictureListPagingDisplayType; }
            set { _pictureListPagingDisplayType = value; }
        }

        public int PictureMaxHeight
        {
            get { return _pictureMaxHeight; }
            set { _pictureMaxHeight = value; }
        }

        public int PictureMaxWidth
        {
            get { return _pictureMaxWidth; }
            set { _pictureMaxWidth = value; }
        }

        public string AdminDirectory
        {
            get { return _adminDirectory; }
            set { _adminDirectory = value; }
        }

        public string DataDirectory
        {
            get { return _dataDirectory; }
            set { _dataDirectory = value; }
        }

        public string TemplateDirectory
        {
            get { return _templateDirectory; }
            set { _templateDirectory = value; }
        }

        public string PhotosDirectory
        {
            get { return _photosDirectory; }
            set { _photosDirectory = value; }
        }

        public bool CustomErrorPageEnabled
        {
            get { return _customErrorPageEnabled; }
            set { _customErrorPageEnabled = value; }
        }

        public int SlideShowDelay
        {
            get { return _slideShowDelay; }
            set { _slideShowDelay = value; }
        }

        public int SlideShowImageHeight
        {
            get { return _slideShowImageHeight; }
            set { _slideShowImageHeight = value; }
        }

        public int SlideShowImageWidth
        {
            get { return _slideShowImageWidth; }
            set { _slideShowImageWidth = value; }
        }

        public int SlideShowImageQuality
        {
            get { return _slideShowImageQuality; }
            set { if((value > 0) && (value <= 100)) _slideShowImageQuality = value; }
        }

        public bool SlideShowWatermark
        {
            get { return _slideShowWatermark; }
            set { _slideShowWatermark = value; }
        }

        public int SummaryImageHeight
        {
            get { return _summaryImageHeight; }
            set { _summaryImageHeight = value; }
        }

        public int SummaryImageWidth
        {
            get { return _summaryImageWidth; }
            set { _summaryImageWidth = value; }
        }

        public bool SummaryMaintainRatio
        {
            get { return _summaryMaintainRatio; }
            set { _summaryMaintainRatio = value; }
        }

        public int SummaryImageQuality
        {
            get { return _summaryImageQuality; }
            set { if((value > 0) && (value <= 100)) _summaryImageQuality = value; }
        }

        public bool SummaryWatermark
        {
            get { return _summaryWatermark; }
            set { _summaryWatermark = value; }
        }

        public string WatermarkImage
        {
            get { return _watermarkImage; }
            set { _watermarkImage = value; }
        }

        public string WatermarkText
        {
            get { return _watermarkText; }
            set { _watermarkText = value; }
        }

        public Definitions.WatermarkType WatermarkType
        {
            get { return _watermarkType; }
            set { _watermarkType = value; }
        }

        public Definitions.WatermarkPosition WatermarkPosition
        {
            get { return _watermarkPosition; }
            set { _watermarkPosition = value; }
        }

        public string EXIFProperties
        {
            get {return _exifProperties;}
            set {_exifProperties = value;}
        }

        #endregion


        Static Methods#region Static Methods

        /**//// <summary>
        /// return a static Configuration object
        /// </summary>
        /// <returns></returns>
        public static Configuration Instance()
        {
            if (_currentConfiguration == null)
            {
                Configuration.Load();

                if (_currentConfiguration == null)
                    _currentConfiguration = new Configuration();
            }

            return _currentConfiguration;
        }

        public static void Load()
        {
            if (!File.Exists(_configurationFilePath))
            {
                _currentConfiguration = new Configuration();
            }
            else
            {
                XmlSerializer ser    = new XmlSerializer(typeof(Configuration));
                //use uft-8 to read stream
                StreamReader reader    = new StreamReader(_configurationFilePath);

                // Deserialize the object into a AlbumCollection and return it.
                _currentConfiguration = (Configuration) ser.Deserialize(reader);

                reader.Close();

            }

        }

        public static void Load(string configFile)
        {
            _configurationFilePath = configFile;
            Load();
        }

        public static void Save()
        {
            XmlSerializer ser    = new XmlSerializer(typeof(Configuration));
            FileStream fileOut;


            if (!File.Exists(_configurationFilePath))
            {
                fileOut = new FileStream(_configurationFilePath, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.ReadWrite);
            }
            else
            {
                fileOut    = new FileStream(_configurationFilePath, FileMode.Truncate, FileAccess.ReadWrite, FileShare.ReadWrite);
            }
            

            // Serialize the object in XML to the given file stream.
            ser.Serialize(fileOut, _currentConfiguration);

            // Close the file stream.
            fileOut.Close();
        }


        #endregion


    }
}

显然出现异常的代码是Load()方法里的这一句
_currentConfiguration = (Configuration) ser.Deserialize(reader);显然是因为没有  [XmlRoot("Configuration", Namespace=nGrallery.Lib)]

于是我上面类Configuration里的几个属性改为只读(去掉set属性)，结果反序列化可以成功，查看得知那几个被我修改为只读属性的字段值为null。还不死心，我把配置文件ngallery.config里部分结点给去掉，反序列化还是可以成功。。。。

那可想，.net框架底层在处理反序列化时在内存中的映射是通过命名空间(或[XmlRoot(name)]/[XmlElement(name)]/[XmlAttribute("name")..])来映射的，至于对配置节到类属性字段的映射则是匹配不成功就跳过呢？
如果这样的话，那些没有加载到内存中的XML数据很多将会没有什么意义，有没有好的算法来解决这个问题呢？期待中...
有点迷惑