追加大規模なXML

Question

に私はここにXMLに曲の詳細を格納するためのプログラムを足すいますと、私のコード

  private XmlDocument mediaXmlDoc = new XmlDocument(); 
      private XmlNode rootNode; 

      mediaXmlDoc.RemoveAll(); 

      rootNode = mediaXmlDoc.CreateElement("filelist"); 
      mediaXmlDoc.AppendChild(rootNode); 

され、各曲のために、私は次のように詳細を追加しています

  XmlNode file = mediaXmlDoc.CreateElement("file");     

      XmlNode filename = mediaXmlDoc.CreateElement("filename"); 
      filename.InnerText = FileName; 
      file.AppendChild(filename); 

      XmlNode path = mediaXmlDoc.CreateElement("path"); 
      path.InnerText = Path; 
      file.AppendChild(path); 

      XmlNode ext = mediaXmlDoc.CreateElement("ext"); 
      ext.InnerText = Ext; 
      file.AppendChild(ext); 

      XmlNode artist_name = mediaXmlDoc.CreateElement("artist_name"); 
      artist_name.InnerText = ArtistNameString; 
      file.AppendChild(artist_name); 

      XmlNode song_title = mediaXmlDoc.CreateElement("song_title"); 
      song_title.InnerText = SongTitleString; 
      file.AppendChild(song_title); 

      XmlNode genre = mediaXmlDoc.CreateElement("genre"); 
      genre.InnerText = GenreString; 
      file.AppendChild(genre); 

      XmlNode comments = mediaXmlDoc.CreateElement("comments"); 
      comments.InnerText = CommentsString; 
      file.AppendChild(comments); 

      XmlNode album_name = mediaXmlDoc.CreateElement("album_name"); 
      album_name.InnerText = AlbumNameString; 
      file.AppendChild(album_name); 

      XmlNode year = mediaXmlDoc.CreateElement("year"); 
      year.InnerText = YearString; 
      file.AppendChild(year); 

      XmlNode track_number = mediaXmlDoc.CreateElement("track_number"); 
      track_number.InnerText = TrackNumberString; 
      file.AppendChild(track_number); 

      XmlNode duration = mediaXmlDoc.CreateElement("duration"); 
      duration.InnerText = DurationString; 
      file.AppendChild(duration); 

      XmlNode bit_rate = mediaXmlDoc.CreateElement("bit_rate"); 
      bit_rate.InnerText = BitRateString; 
      file.AppendChild(bit_rate); 

      XmlNode protected_media = mediaXmlDoc.CreateElement("protected"); 
      protected_media.InnerText = ProtectedString; 
      file.AppendChild(protected_media); 

      XmlNode sample_rate = mediaXmlDoc.CreateElement("sample_rate"); 
      sample_rate.InnerText = SampleRateString; 
      file.AppendChild(sample_rate); 

      XmlNode channels = mediaXmlDoc.CreateElement("channels"); 
      channels.InnerText = ChannelsString; 
      file.AppendChild(channels); 

      rootNode.AppendChild(file); 

以下私の問題は、xmlのサイズが増加するにつれて、このパフォーマンスの問題を解決するために何ができるかを減らすように感じます。

ありがとう、

Answer 1

実際にはXmlWriterクラスを使用する必要があります。 XmlDocumentはメモリ内のすべてのxmlを読み込み、巨大なファイルでは操作が非常に遅くなる可能性があります。

このクラスの使用方法については、this example tutorialを参照してください。

ではなく、常にXmlDocumentより

Answer 2

使用したXmlWriterには、それが大きなファイル

Answer 3

使用XmlWriter

Answer 4

void TraverseNode(string path) 
    { 
     XmlDocument xmlDocument = new XmlDocument(); 
     xmlDocument.Load(new StreamReader(path, System.Text.Encoding.UTF8)); 
     XmlNodeList _nodeList = xmlDocument.SelectNodes("//session"); 
     string strxml = ""; 
     string completexml = ""; 
     for (int inode = 0; inode < _nodeList.Count; inode++) 
     { 
      if(inode==0) 
       strxml = formatxml(_nodeList[inode].OuterXml).ChildNodes[0].ChildNodes[0].OuterXml; 
      else 
       strxml = formatxml("<session>" + _nodeList[inode].OuterXml + "</session>").ChildNodes[0].ChildNodes[0].OuterXml; 

      completexml += strxml; 
      strxml = ""; 

     } 
     XmlDocument newxml = new XmlDocument(); 
     newxml.LoadXml("<session>" + completexml + "</session>"); 
     newxml.Save(@"C:\Working\Teradata\ssis\out_18.xml"); 
    } 


    XmlDocument formatxml(string xml) 
    { 
     XmlDocument xmlDocument = new XmlDocument(); 
     xmlDocument.LoadXml(xml); 
     XmlNode nodeListOtherInterest = xmlDocument.SelectSingleNode("//session/data/account/additionalOtherInterest/address"); 
     XmlNode acAddress = xmlDocument.SelectSingleNode("//session/data/account/address"); 
     XmlNode locationaddress = xmlDocument.SelectSingleNode("//session/data/account/location/address"); 
     XmlNode lineaddress = xmlDocument.SelectSingleNode("//session/data/policy/line/address"); 
     string strotherinterest = ""; 
     string stracAddress = ""; 
     string strlocationaddress = ""; 
     string strlineaddress = ""; 
     string straddressess=""; 

     XmlNodeList statecodes; 
     statecodes = xmlDocument.SelectNodes("//session/data/policy/line/linestate/linestateterm/coverage/statCode"); 

     for (int i = 0; i < statecodes.Count; i++) 
     { 
      if(statecodes[i].InnerText=="0") 
       statecodes[i].ParentNode.RemoveChild(statecodes[i]); 
     } 

     if (xmlDocument.SelectSingleNode("//session/data/account/additionalOtherInterest/address") != null) 
     { 
      strotherinterest = "<address_otherinterest>" + nodeListOtherInterest.InnerXml + "</address_otherinterest>"; 
      nodeListOtherInterest.ParentNode.RemoveChild(nodeListOtherInterest); 
     } 
     if (xmlDocument.SelectSingleNode("//session/data/account/address") != null) 
     { 
      stracAddress = "<address_Account>" + acAddress.InnerXml + "</address_Account>"; 
      acAddress.ParentNode.RemoveChild(acAddress); 
     } 
     if (xmlDocument.SelectSingleNode("//session/data/account/location/address") != null) 
     { 
      strlocationaddress = "<address_location>" + locationaddress.InnerXml + "</address_location>"; 
      locationaddress.ParentNode.RemoveChild(locationaddress); 
     } 
     if (xmlDocument.SelectSingleNode("//session/data/policy/line/address") != null) 
     { 
      strlineaddress = "<address_line>" + lineaddress.InnerXml + "</address_line>"; 
      lineaddress.ParentNode.RemoveChild(lineaddress); 
     } 
     straddressess= "<addressess>"+strotherinterest +stracAddress+strlocationaddress+strlineaddress + "</addressess>"; 
     XmlDocument address = new XmlDocument(); 
     address.LoadXml(straddressess); 
     XPathNavigator pnav = xmlDocument.CreateNavigator(); 
     pnav.MoveToChild("session", ""); 
     pnav.MoveToChild("session",""); 
     pnav.AppendChild(straddressess); 
     return xmlDocument; 
    } 

に適します