SoapTypeAttribute (System.Xml.Serialization) Example Code Fails
From: David Bozzini (DavidBozzini_at_discussions.microsoft.com)
Date: 01/13/05
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Date: Thu, 13 Jan 2005 13:43:03 -0800
[This is a repost, never got an answer the first time, 12/17/2004]
This is for Microsoft .NET Framework 1.1.
The example code given in the .NET Framework Class Library MSDN documentation
for SoapTypeAttribute Class [C#] compiles but fails at runtime. Can someone
possibly offer a fix, or a workaround? We need a fix or workaround in order
to proceed with using SoapTypeAttribute in our own code.
Here is the code, copied verbatim from the MSDN docs. When compiled as a
.NET Console application and run, it throws an exception like so:
[begin exception text]
An unhandled exception of type 'System.InvalidOperationException' occurred
in system.xml.dll
Additional information: There was an error generating the XML document.
[end exception text]
[begin MSDN example code]
using System;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
// The SoapType is overridden when the
// SerializeOverride method is called.
[SoapType("SoapGroupType", "http://www.cohowinery.com")]
public class Group
{
public string GroupName;
public Employee[] Employees;
}
[SoapType("EmployeeType")]
public class Employee{
public string Name;
}
public class Run
{
public static void Main()
{
Run test = new Run();
test.SerializeOriginal("SoapType.xml");
test.SerializeOverride("SoapType2.xml");
test.DeserializeObject("SoapType2.xml");
}
public void SerializeOriginal(string filename){
// Create an instance of the XmlSerializer class that
// can be used for serializing as a SOAP message.
XmlTypeMapping mapp =
(new SoapReflectionImporter()).ImportTypeMapping(typeof(Group));
XmlSerializer mySerializer =
new XmlSerializer(mapp);
// Writing the file requires a TextWriter.
TextWriter writer = new StreamWriter(filename);
// Create an instance of the class that will be serialized.
Group myGroup = new Group();
// Set the object properties.
myGroup.GroupName = ".NET";
Employee e1 = new Employee();
e1.Name = "Pat";
myGroup.Employees=new Employee[]{e1};
// Serialize the class, and close the TextWriter.
mySerializer.Serialize(writer, myGroup);
writer.Close();
}
public void SerializeOverride(string filename)
{
// Create an instance of the XmlSerializer class that
// uses a SoapAttributeOverrides object.
XmlSerializer mySerializer = CreateOverrideSerializer();
// Writing the file requires a TextWriter.
TextWriter writer = new StreamWriter(filename);
// Create an instance of the class that will be serialized.
Group myGroup = new Group();
// Set the object properties.
myGroup.GroupName = ".NET";
Employee e1 = new Employee();
e1.Name = "Pat";
myGroup.Employees=new Employee[]{e1};
// Serialize the class, and close the TextWriter.
mySerializer.Serialize(writer, myGroup);
writer.Close();
}
private XmlSerializer CreateOverrideSerializer()
{
// Create and return an XmlSerializer instance used to
// override and create SOAP messages.
SoapAttributeOverrides mySoapAttributeOverrides =
new SoapAttributeOverrides();
SoapAttributes soapAtts = new SoapAttributes();
// Override the SoapTypeAttribute.
SoapTypeAttribute soapType = new SoapTypeAttribute();
soapType.TypeName = "Team";
soapType.IncludeInSchema = false;
soapType.Namespace = "http://www.microsoft.com";
soapAtts.SoapType = soapType;
mySoapAttributeOverrides.Add(typeof(Group),soapAtts);
// Create an XmlTypeMapping that is used to create an instance
// of the XmlSerializer. Then return the XmlSerializer object.
XmlTypeMapping myMapping = (new SoapReflectionImporter(
mySoapAttributeOverrides)).ImportTypeMapping(typeof(Group));
XmlSerializer ser = new XmlSerializer(myMapping);
return ser;
}
public void DeserializeObject(string filename){
// Create an instance of the XmlSerializer class.
XmlSerializer mySerializer = CreateOverrideSerializer();
// Reading the file requires a TextReader.
TextReader reader = new StreamReader(filename);
// Deserialize and cast the object.
Group myGroup;
myGroup = (Group) mySerializer.Deserialize(reader);
Console.WriteLine(myGroup.GroupName);
}
}
[end MSDN example code]
Thanks.
-- David Bozzini Susquehanna International Group
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