C＃使用XMLReader類f獲取XML子節點值

Question

我有個問題。

我正在嘗試使用Xmlreader類讀取巨大的XML文件。 正常讀取和打印（控制台）工作正常。

但是現在我正在嘗試為指定的子節點進行過濾，這是行不通的。

例如：

這是我的XML文件

`<?xml version="1.0" encoding="UTF-8"?>
<Event>
   <System>
      <Provider Name="NetApp-Security-Auditing" Guid="{3CB2A168-FE19-4A4E-BDAD-DCF422F13473}" />
      <EventID>4660</EventID>
      <EventName>Delete Object Attempt</EventName>
      <Version>101.3</Version>
      <Source>CIFS</Source>
      <Level>0</Level>
      <Opcode>0</Opcode>
      <Keywords>0x8020000000000000</Keywords>
      <Result>Audit Success</Result>
      <TimeCreated SystemTime="2018-04-27T08:54:59.739617000Z" />
      <Correlation />
      <Channel>Security</Channel>
      <Computer>ta-cluster01/svm_ta_cifs</Computer>
      <ComputerUUID>7ec98fb6-de63-11e4-ba38-00a09864e708/0bbaf036-10e8-11e5-83fa-00a09864e708</ComputerUUID>
      <Security />
   </System>
   <EventData>
      <Data Name="SubjectIP" IPVersion="4">172.16.6.162</Data>
      <Data Name="SubjectUnix" Uid="65534" Gid="65534" Local="false" />
      <Data Name="SubjectUserSid">S-1-5-21-4259334589-2141180538-67931973-13448</Data>
      <Data Name="SubjectUserIsLocal">false</Data>
      <Data Name="SubjectDomainName">TDLZ2</Data>
      <Data Name="SubjectUserName">hegelbachpatrik</Data>
      <Data Name="ObjectServer">Security</Data>
      <Data Name="ObjectType">File</Data>
      <Data Name="HandleID">00000000000420;00;00011f73;13890cc2</Data>
      <Data Name="ObjectName">(gruppe05_homes);/test/testuser/Vorlagen/LiveContent/16/Managed/Document Themes/1031/TM02836342[[fn=Ion]].thmx</Data>
      <Data Name="InformationSet">Delete on last close;</Data>
   </EventData>
</Event>` 

現在，我要檢查子節點InformationSet的名稱是否包含值“最后一次關閉時刪除”。 如果為True，則應打印整個EventData節點

在下面，您將看到我試圖打印子節點“ Data”的C＃代碼，但是它不起作用，有人可以幫助我嗎？

 var reader = XmlReader.Create(@"\\testserver\Example.xml");
        var test = reader.ReadToDescendant("EventData");
        while (reader.Read()&& reader.Name == "Data")
        {
           Console.WriteLine(reader.Value);           




        }

正確的文件如下所示

@jdweng

對不起，我應該說清楚。 XML文件如下所示。

<Events xmlns="http://www.netapp.com/schemas/ONTAP/2007/AuditLog">
<Event><System><Provider Name="NetApp-Security-Auditing" Guid="{3CB2A168-FE19-4A4E-BDAD-DCF422F13473}"/><EventID>4656</EventID><EventName>Open Object</EventName><Version>101.3</Version><Source>CIFS</Source><Level>0</Level><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><Result>Audit Success</Result><TimeCreated SystemTime="2018-05-04T11:13:55.231818000Z"/><Correlation/><Channel>Security</Channel><Computer>ta/svm_ta_cifs</Computer><ComputerUUID>7ec98fb6-de63-11e4-ba38-00a09864e708/0bbaf036-10e8-11e5-83fa-00a09864e708</ComputerUUID><Security/></System><EventData><Data Name="SubjectIP" IPVersion="4">172.16.6.71</Data><Data Name="SubjectUnix" Uid="65534" Gid="65534" Local="false"></Data><Data Name="SubjectUserSid">S-1-5-21-4259334589-2141180538-67931973-2742</Data><Data Name="SubjectUserIsLocal">false</Data><Data Name="SubjectDomainName">test</Data><Data Name="SubjectUserName">test</Data><Data Name="ObjectServer">Security</Data><Data Name="ObjectType">File</Data><Data Name="HandleID">00000000000420;00;00015148;21fdd9f2</Data><Data Name="ObjectName">(gruppe05_homes);/tal/test/Scripte indiv/ISAGReports_RichTextWerbemitteilungen.txt</Data><Data Name="AccessList">%%4423 %%1537 </Data><Data Name="AccessMask">1080</Data><Data Name="DesiredAccess">Read Attributes; Delete; </Data><Data Name="Attributes">Open a non-directory; </Data></EventData></Event>
<Event><System><Provider Name="NetApp-Security-Auditing" Guid="{3CB2A168-FE19-4A4E-BDAD-DCF422F13473}"/><EventID>4660</EventID><EventName>Delete Object Attempt</EventName><Version>101.3</Version><Source>CIFS</Source><Level>0</Level><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><Result>Audit Success</Result><TimeCreated SystemTime="2018-05-04T11:13:55.238819000Z"/><Correlation/><Channel>Security</Channel><Computer>ta/svm_ta_cifs</Computer><ComputerUUID>7ec98fb6-de63-11e4-ba38-00a09864e708/0bbaf036-10e8-11e5-83fa-00a09864e708</ComputerUUID><Security/></System><EventData><Data Name="SubjectIP" IPVersion="4">172.16.6.71</Data><Data Name="SubjectUnix" Uid="65534" Gid="65534" Local="false"></Data><Data Name="SubjectUserSid">S-1-5-21-4259334589-2141180538-67931973-2742</Data><Data Name="SubjectUserIsLocal">false</Data><Data Name="SubjectDomainName">test</Data><Data Name="SubjectUserName">test</Data><Data Name="ObjectServer">Security</Data><Data Name="ObjectType">File</Data><Data Name="HandleID">00000000000420;00;00015148;21fdd9f2</Data><Data Name="ObjectName">(gruppe05_homes);/tal/test/ISAGReports_RichTextWerbemitteilungen.txt</Data><Data Name="InformationSet">Delete on last close; </Data></EventData></Event>
</Events>

Answer 1

嘗試以下操作：

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Xml;
    using System.Xml.Linq;

    namespace ConsoleApplication1
    {
        class Program
        {
            const string FILENAME = @"c:\temp\test.xml";
            static void Main(string[] args)
            {
                var reader = XmlReader.Create(FILENAME);
                reader.MoveToContent();
                string ns = reader.NamespaceURI;
                //if this doesn't work hard code ns
                // string ns = "http://www.netapp.com/schemas/ONTAP/2007/AuditLog";

                while (!reader.EOF)
                {
                    if (reader.Name != "EventData")
                    {
                        reader.ReadToFollowing("EventData",ns);
                    }
                    if (!reader.EOF)
                    {
                        XElement eventData = (XElement)XElement.ReadFrom(reader);
                        foreach (XElement data in eventData.Elements("Data"))
                        {
                            Console.WriteLine("{0} : {1}", (string)data.Attribute("Name"), (string)data);
                        }
                    }
                }
                Console.ReadLine();

            }
        }
    }

Answer 2

using (var reader = XmlReader.Create("test.xml"))
{
    XNamespace ns = "http://www.netapp.com/schemas/ONTAP/2007/AuditLog";

    while (reader.ReadToFollowing("EventData"))
    {
        var eventData = (XElement)XElement.ReadFrom(reader);

        var data = eventData.Elements(ns + "Data")
            .FirstOrDefault(e => e.Attribute("Name").Value == "InformationSet");

        if (data != null && data.Value.Contains("Delete on last close"))
        {
            // use eventData somehow
            Console.WriteLine(eventData);
        }
    }
}

Answer 3

您可以像這樣在C＃中讀取節點/子節點：

XmlDocument source = new XmlDocument();
//local or http file
source.Load("C:\\Users\\path\\myFile.xml");

foreach (XmlNode node in source.DocumentElement.SelectNodes("/parentNode/xmlTag/targetNode"))
            {
                string text = node.InnerText;
                //do your stuff with XML value here
                System.Diagnostics.Debug.WriteLine(text);
            }

方法SelectNodes（）應該做到這一點。