XmlSerializer不填充子元素

Question

I've used XSD.EXE to convert an XSD into an object. That works fine and I can Deserialize using XMLSerializer just fine, except that the subelements which are generated as arrays don't populate.

    private SubElements[] subelementsField;

    /// <remarks/>
    [System.Xml.Serialization.XmlArrayItemAttribute("SubElement", IsNullable=false)]
    public SubElement[] SubElement {
        get {
            return this.subelementField;
        }
        set {
            this.subelementField = value;
        }
    }

Even though there is data in the XML it just doesn't populate it when I use the following code:

// Deserialize
var result = serializer.Deserialize(new StringReader(data.XMLText.ToString()));

The root elements all work fine, just not the sub elements of this type of XML data:

<RootNode Weight="205" Year="1995">
  <ParentNodeWhichWorksFine Contact="John Doe">
    <SubElement SomeAttribute="123">
      <Location>New York City</Location>
      <Team>New York Pizza</Team>
    </SubElement>
  </ParentNodeWhichWorksFine>
</RootNode>

Am I missing some hints or something else that XSD.EXE is not including?

Answer 1

I assume the class within which you define property SubElement is the one corresponding to ParentNodeWhichWorksFine ? If so, try this change:

[XmlElement("SubElement", IsNullable=false)]
public SubElement[] SubElement

Also, you say that you've generated this code using xsd.exe. What was the input in that case - an .xsd file? If so, can you post the relevant part of it, too?

Answer 2

The XmlArrayItemAttribute attribute specifies a name for the child nodes of the array element defined by the public member SubElements . So that sample xml doesn't conform to the xsd, if that's the exact generated class xsd.exe produced.

According to the generated class, the <SubElement> items should be contained in a parent <SubElements> node like this:

<RootNode Weight="205" Year="1995">
  <ParentNodeWhichWorksFine Contact="John Doe">
    <SubElements>
      <SubElement SomeAttribute="123">
        <Location>New York City</Location>
        <Team>New York Pizza</Team>
      </SubElement>
    </SubElements>
  </ParentNodeWhichWorksFine>
</RootNode>

If you have control over the schema, I think changing it so that it corresponds to the sample xml is preferable (no parent node, following Pavel's solution ), since the parent array nodes are superfluous.

Answer 3

Looks like your SubElement array in your generated class is missing the [XmlArray] attribute.

It needs to look like this:

[System.Xml.Serialization.XmlArrayAttribute("SubElements")]
[System.Xml.Serialization.XmlArrayItemAttribute("SubElement", IsNullable=false)]
public SubElement[] SubElement {
}

Something is not quite right in your XSD file, I reckon.