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Last Updated: February 25, 2016
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972
· mokhtar ashour

Parsing Xml in C#

Assume we want to extract some objects from an xml file using C#.

the xml file:

<Annotation text="Brazilian oil giant Petrobras and U.S. oilfield service company Halliburton have signed a technological cooperation agreement, Petrobras announced Monday.">
<Resources>
<Resource URI="http://dbpedia.org/resource/Oil" support="803" types="" surfaceForm="oil" offset="10" similarityScore="0.10925747454166412" percentageOfSecondRank="0.43448779313556946"/>
<Resource URI="http://dbpedia.org/resource/Company" support="427" types="" surfaceForm="company" offset="56" similarityScore="0.10083067417144775" percentageOfSecondRank="0.562207867961491"/>
</Resources>
</Annotation>

we need the URI and surfaceForm pair from the document.

the C# code to do the parsing:

using  System.Xml.Linq

//some code here.           
 XDocument doc = XDocument.Parse("XmlFileName.xml");
 var Resources = doc.Descendants("Resource").Select(resource => new
            {
                URI = resource.Attribute("URI").Value,
                Entity = resource.Attribute("surfaceForm").Value,
            }).ToList();
//to arrange the list of objects in a dictionary

Dictionary<string, Uri> entities = new Dictionary<string, Uri>();

foreach (var resource in Resources)
{
        entities.Add(resource.Entity, new Uri(resource.URI));
}

note that the resource.Attribute will work with the xml element attributes, if you want it to access elements, then resource.Element it is :-)

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