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Query an xml file

Posted on 2014-01-17
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Last Modified: 2014-01-22
I have an xml file, that consists of the following structure.

<XtraSerializer version="1.0" application="PivotGridControl">
  <property name="#LayoutVersion" isnull="true" />
  <property name="$PivotGridControl" iskey="true" value="PivotGridControl">
    <property name="Fields" iskey="true" value="41">
      <property name="Item1" isnull="true" iskey="true">
        <property name="AreaIndex">0</property>
        <property name="Name">fieldCode</property>
        <property name="Area">RowArea</property>
        <property name="FilterValues" isnull="true" iskey="true">
          <property name="DeferFilterString" />
          <property name="ValuesCore" iskey="true" value="0" />
          <property name="Values">~Xtra#Array0, </property>
          <property name="ShowBlanks">true</property>
          <property name="FilterType">Excluded</property>
        </property>
      </property>
      <property name="Item2" isnull="true" iskey="true">
        <property name="AreaIndex">1</property>
        <property name="Name">fieldGroup</property>
        <property name="Area">RowArea</property>
        <property name="FilterValues" isnull="true" iskey="true">
          <property name="DeferFilterString" />
          <property name="ValuesCore" iskey="true" value="0" />
          <property name="Values">~Xtra#Array0, </property>
          <property name="ShowBlanks">true</property>
          <property name="FilterType">Excluded</property>
        </property>
      </property>
         <property name="Item3" isnull="true" iskey="true">
        <property name="AreaIndex">2</property>
        <property name="Name">fieldProduct</property>
        <property name="Area">ColumnArea</property>
        <property name="FilterValues" isnull="true" iskey="true">
          <property name="DeferFilterString" />
          <property name="ValuesCore" iskey="true" value="0" />
          <property name="Values">~Xtra#Array0, </property>
          <property name="ShowBlanks">true</property>
          <property name="FilterType">Excluded</property>
        </property>
      </property>
      </property>
</XtraSerializer>

I need to loop through all the Items under the element Fields and get the Name and Area attribtutes for each Item
Basically loop through this node
    <property name="Fields" iskey="true" value="41">
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Question by:countrymeister
  • 2
3 Comments
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 39789681
Hi countrymeister;

The following is using Linq to XML to return the property nodes who's attributes are either name="Name" or name="Area"

// If the XML document is stored on the file system use this line and replace the file path with the one that points to the loction and name of yours.
XDocument doc = XDocument.Load("C:/Working Directory/XtraSerializer.xml");
// Or use this line if the XML is stored in a string in your program replacing VariableNameHere with the actual variable name hollding the XML.
XDocument doc = XDocument.Parse(VariableNameHere);

var results = from nodes in doc.Descendants("property")
              where nodes.Attribute("name").Value == "Fields"
              from node in nodes.Elements("property").Descendants("property")
              where node.Attribute("name").Value == "Name" || node.Attribute("name").Value == "Area"
              select node;

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Author Comment

by:countrymeister
ID: 39789703
Hi ! FernandoSoto

I need all the Items that have aboth these attributes, because sone of my nodes could have only the name and no area attribute.
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LVL 62

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 39789921
Try this.

var results = from nodes in doc.Descendants("property")
              where nodes.Attribute("name").Value == "Fields"
              from node in nodes.Elements("property")
              let name = node.Elements("property").Where(n => n.Attribute("name").Value == "Name").FirstOrDefault()
              let area = node.Elements("property").Where(n => n.Attribute("name").Value == "Area").FirstOrDefault()
              where name != null && area != null
              select new
              {
                  name,
                  area
              };

foreach(var pairOfNodes in results)
{
    MessageBox.Show(pairOfNodes.name + " : " + pairOfNodes.area);
}

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