I have a large XML document that I have loaded into an XmlDocument
and I want to use the XmlSerializer
class to deserialize selected elements from it into a .NET class generated using xsd.exe.
Here's an MCVE of what I've tried so far; the xsd and generated class are at the end of the post. As noted in the comments in the code, I am getting an InvalidOperationException
- <Cars xmlns:'http://MyNamespace' /> was not expected
:
static string XmlContent = @"
<RootNode xmlns=""http://MyNamespace"">
<Cars>
<Car make=""Volkswagen"" />
<Car make=""Ford"" />
<Car make=""Opel"" />
</Cars>
</RootNode>";
static void TestMcve()
{
var doc = new XmlDocument();
doc.LoadXml(XmlContent);
var nsMgr = new XmlNamespaceManager(doc.NameTable);
nsMgr.AddNamespace("myns", "http://MyNamespace");
var rootSerializer = new XmlSerializer(typeof(RootNode));
var root = (RootNode) rootSerializer.Deserialize(new XmlNodeReader(doc));
Console.WriteLine(root.Cars[0].make); // Works fine so far
var node = doc.DocumentElement.SelectSingleNode("myns:Cars", nsMgr);
Console.WriteLine(node.OuterXml);
var carSerializer = new XmlSerializer(typeof(Car));
using (var reader = new XmlNodeReader(node))
{
// What I want is a list of Car instances deserialized from
// the Car child elements of the Cars element.
// The following line throws an InvalidOperationException
// "<Cars xmlns:'http://MyNamespace' /> was not expected"
// If I change SelectSingleNode above to select "myns:Cars/myns:Car"
// I get "<Car xmlns:'http://MyNamespace' /> was not expected"
var result = carSerializer.Deserialize(reader);
}
}
I also want to subsequently update my Car
class instance, and insert it back into the document using the XmlSerializer
, which is the subject of a follow-up question How to insert a node in a large document using XmlSerializer
.
The xsd and generated classes follow:
<xs:schema xmlns="http://MyNamespace" xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://MyNamespace"
elementFormDefault="qualified" attributeFormDefault="unqualified"
version="3.9.0.8">
<xs:complexType name="Cars">
<xs:sequence>
<xs:element name="Car" type="Car" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="Car">
<xs:attribute name="make" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="RootNode">
<xs:sequence>
<xs:element name="Cars" type="Cars" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
<xs:element name="RootNode" type="RootNode" />
</xs:schema>
Code generated by xsd.exe:
using System.Xml.Serialization;
/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.6.1055.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace="http://MyNamespace")]
[System.Xml.Serialization.XmlRootAttribute(Namespace="http://MyNamespace", IsNullable=false)]
public partial class RootNode {
private Car[] carsField;
/// <remarks/>
[System.Xml.Serialization.XmlArrayItemAttribute(IsNullable=false)]
public Car[] Cars {
get {
return this.carsField;
}
set {
this.carsField = value;
}
}
}
/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.6.1055.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace="http://MyNamespace")]
public partial class Car {
private string makeField;
/// <remarks/>
[System.Xml.Serialization.XmlAttributeAttribute()]
public string make {
get {
return this.makeField;
}
set {
this.makeField = value;
}
}
}
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