Pogramming the XmlDOM in C#

sencee · March 10th, 2006, 06:53 AM

Im new to using Xml with C#. I have been hacking around at one section for a day now and can't get it to work at all. Rather than confuse you with my shambles code, I will jsut explain the concept. Im also slightly confussed, or misslead with my understanding of the type deffinitions, and their methods for subtrees.

Code:

XML...
<Root>
   <MajorKey att="MAJattribute1">
      <MinorKey att="MINattribute1">
          <Value>value1</Value>
      </MinorKey>
      <MinorKey att="MINattribute2">
         <Value>value2</value>
      </MinorKey>
   </MajorKey>
   <MajorKey att="MAJattribute2">
      <MinorKey att="MINattribute3">
          <Value>value3</Value>
      </MinorKey>
      <MinorKey att="MINattribute4">
         <Value>value4</value>
      </MinorKey>
   </MajorKey>
</Root>

Im having trouble getting it to create a nodelist to children underneath a node based on it's att (attribute) value. Also, I want to extract that attribute value into a string so "MAJattribute1" would gointo a string inside the loop for that node treversal.

Any help, or suggestions.

I have spent hours and hours reading, and cant seem to find anything to pinpoint this...only ever creating attributes indide a single node, not looping through based on the attribute value.

IM GETTING STRESSED

Regards
njc

joefawcett · March 10th, 2006, 07:08 AM

Can you post an example of your desired output?

--

Joe (Microsoft MVP - XML)

sencee · March 10th, 2006, 08:29 AM

For the minutes, just a variable inside the loops

PSEUDO

Code:

Loop
XmlNodeList MajorKeyNodeList

ForEach (MajorKey in MajorKeyNodeList)
      string varMajorKey = the contents of the majorkey attribute (varKey=MAJattribute1)
      XmlNodeList MinorKeyNodeList (a list of all the MinorKeys under current Majorkey)
      ForEach (MinorKey in MinorKeyNodeList)
          string varMinorKey = content MinorKey attribute
          string CompleteKey = varMajorKey+varMinorKey
  
          XmlNodeList ValuesNodeList (a list of all the value elements)

          ForEach (Value in ValueNodeList)
             string varValue = CurrentElement.InnerText

etc

please excuse the shabby use of half attmpted failed syntax/half pesudo.

sencee · March 10th, 2006, 09:37 AM

I'd really appreciate any help on this Joe. Im bubbling :)

joefawcett · March 10th, 2006, 10:14 AM

Code:

using System;
using System.Xml;

namespace DomNodeList
{
  class Program
  {
    static void Main(string[] args)
    {
      XmlDocument doc = new XmlDocument();
      doc.Load(@"D:\workjjf\scripts\xml\MajorKeys.xml"); //<path to XML here>
      XmlNodeList majorKeyList = doc.SelectNodes(@"/Root/MajorKey");
      foreach (XmlNode majorKeyNode in majorKeyList)
      {
        XmlElement majorElement = majorKeyNode as XmlElement;
        string majorAttValue = "<null>";
        if (majorElement != null)
        {
          string attValue = majorElement.GetAttribute("att");
          if (attValue != null)
          {
            majorAttValue = attValue;
          }
        }
        Console.WriteLine(majorAttValue);
        XmlNodeList minorKeyList = majorKeyNode.SelectNodes(@"MinorKey");
        foreach (XmlNode minorKeyNode in minorKeyList)
        {
          XmlElement minorElement = minorKeyNode as XmlElement;
          string minorAttValue = "<null>";
          if (minorElement != null)
          {
            string attValue2 = minorElement.GetAttribute("att");
            if (attValue2 != null)
            {
              minorAttValue = attValue2;
            }
          }
          Console.WriteLine("\t" + minorAttValue);
          XmlNodeList valueList = minorElement.SelectNodes("Value");
          foreach (XmlNode valueNode in valueList)
          {
            Console.WriteLine("\t\t" + valueNode.InnerText);
          }
        }
      }
      Console.ReadLine();
    }
  }
}

--

Joe (Microsoft MVP - XML)

sencee · March 10th, 2006, 11:09 AM

Thanks Joe, however, I had just figured it out!
I really aprreciate your effort, exactly the same as what I ended up with, apart from mine is event based.

Mucho Appreciated.