When try to parse xml with attributes getting empty array

Question

I was trying to serialize xml, the sample structure like this

<nodes>
    <node1>87576</node1>
    <node2>10</node2>
    <crsa>
        <crsa x="0">3487</crsa>
        <crsa x="1">0</crsa>
        <crsa x="2">0</crsa>
    </crsa>
    <node3>0</node3>
    <node4>131</node4>
</nodes>

This is the generated class.

[XmlRoot(ElementName = "nodes")]
public class Nodes
{
    [XmlElement(ElementName = "node1")]
    public string node1 { get; set; }
    [XmlElement(ElementName = "node2")]
    public string node2 { get; set; }
    [XmlElement(ElementName = "node3")] 
    public string node3 { get; set; }
    [XmlElement(ElementName = "crsa")]
    public Crsa[] crsa { get; set; }
    [XmlElement(ElementName = "node4")]
    public string node4 { get; set; }
}

[XmlRoot(ElementName = "crsa")]
public class Crsa
{
    [XmlAttribute("x")]
    public string X { get; set; }
    [XmlText]
    public string Text { get; set; }
}

When I serialize the xml to the class, the crsa array values are getting empty. The other node values are serialized correctly. When I generated the class using http://xmltocsharp.azurewebsites.net/ the Crsa is not an array public Crsa crsa { get; set; }. I tried with both but the values are getting empty.

Is that really the XML you have to work with? It appears the crsa element has been given two completely different roles to play, being both the container and the contained item. — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented Jul 13, 2016 at 6:39
@Damien Yes, the node name was same. What was the issue in container and the contained item? — rebornx
– rebornx, Commented Jul 13, 2016 at 6:44
There's no specific issue, per se. It's just that I suspect you'll find that it's this aspect that's tripping up the tools. — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented Jul 13, 2016 at 6:48

dbc · Accepted Answer · 2016-07-13 06:50:45Z

1

The <crsa> nodes have both an outer element and inner element(s) of the same name. In order to serialize your Crsa[] collection with an outer container element in this manner, you need to decorate the crsa property with [XmlArray] instead of [XmlElement]:

[XmlRoot(ElementName = "nodes")]
public class Nodes
{
    [XmlElement(ElementName = "node1")]
    public string node1 { get; set; }
    [XmlElement(ElementName = "node2")]
    public string node2 { get; set; }
    [XmlElement(ElementName = "node3")] 
    public string node3 { get; set; }

    [XmlArray("crsa")]
    [XmlArrayItem("crsa")]
    public Crsa[] crsa { get; set; }

    [XmlElement(ElementName = "node4")]
    public string node4 { get; set; }
}

The inner [XmlArrayItem] attribute sets the name of the nested elements.

Sample fiddle.

answered Jul 13, 2016 at 6:50

dbc

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