I want to build a C# object from hierarchical XML data usinq LINQ. I have loaded the XML as an XDocument
(by reading the XML from a file into a string first). I need some guidance on how I should parse this.
Example string read from XML file as
<?xml version="1.0" encoding="utf-8" ?>
<categories version="1.0">
<category id="0" name="women" description="test">
<category id="01" name="tops" description="test"></category>
<category id="02" name="bottoms" description="test"></category>
<category id="03" name="accessories" description="test"></category>
</category>
<category id="1" name="men" description="test">
<category id="11" name="shirts" description="test"></category>
<category id="12" name="trousers" description="test"></category>
<category id="13" name="accessories" description="test"></category>
</category>
<category id="2" name="kids & baby" description="test" />
<category id="3" name="home & living" description="test" />
</categories>
And I have such a POCO class:
[DataContract]
public class Category
{
[DataMember]
public int Id { get; set; }
[DataMember]
public string Name { get; set; }
[DataMember]
public string Description { get; set; }
[DataMember]
public List<Category> SubCategories { get; set; }
}
You have two options.
Use .NET serialization, in which case you need to specify the XML mappings by decorating your POCO class with appropriate attributes (property name ⇄ XML element name).
Use LINQ to XML (like you want do). In that case, the code could look something like this:
var categories = x.Root.Elements().Select(e => new Category { Id = int.Parse(e.Attribute("id").Value), Name = e.Attribute("name").Value, Description = e.Attribute("description").Value, SubCategories = e.Elements().Select(e1 => new Category { Id = int.Parse(e1.Attribute("id").Value), Name = e1.Attribute("name").Value, Description = e1.Attribute("description").Value }).ToList() }).ToList();
Or recursively, by adding a recursive method Parse
to your class:
public static Category Parse(XElement value) { return new Category { Id = int.Parse(value.Attribute("id").Value), Name = value.Attribute("name").Value, Description = value.Attribute("description").Value, SubCategories = value.Elements().Select(newvalue => Parse(newvalue)).ToList() }; }
and calling it like this:
var categories = x.Root.Elements().Select(e => Category.Parse(e)).ToList();
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