Controlling Proxy Generation via SchemaImporterExtensions
In my previous entry on Solving a WS-Oops with ASMX 2.0, I hinted at a code smell. One of the things that I started thinking about was how to leverage a SchemaImporterExtension to control the proxy generation. I was thinking about controlling the serialization of the custom token and making it simpler on the consumer when the token is expressed in a header, which is explicitly specified as part of the contract in the WSDL. I started down that road, and thought "why am I doing this?"
Honestly, now that I have the WSE 3.0 implementation is done (and I am working on the blog post to show it off), I lost interest in the ASMX method because the WSE 3.0 custom policy assertion approach is just so much more elegant than mangling the WSDL with a custom header. Here is how far I got with a custom SIE before ditching it... hopefully this little bit of code will help someone out, I just don't have it in me to code the rest. In fact... if you want to see a pretty cool implementation of a SchemaImporterExtension, see John Bristowe's ode to SIE.
using System;
using System.Xml.Serialization.Advanced;
using System.CodeDom;
namespace Msdn.Web.Services
{
class SampleSchemaImporterExtension : SchemaImporterExtension
{
public override string ImportSchemaType(
string name,
string ns,
System.Xml.Schema.XmlSchemaObject context,
System.Xml.Serialization.XmlSchemas schemas,
System.Xml.Serialization.XmlSchemaImporter importer,
System.CodeDom.CodeCompileUnit compileUnit,
System.CodeDom.CodeNamespace mainNamespace,
System.Xml.Serialization.CodeGenerationOptions options,
System.CodeDom.Compiler.CodeDomProvider codeProvider)
{
if (name.Equals("WSSEDraftSecurityHeader") && ns.Equals("http://schemas.xmlsoap.org/ws/2002/07/secext"))
{
ConsoleColor defaultBackground = Console.BackgroundColor;
ConsoleColor defaultForeground = Console.ForegroundColor;
Console.BackgroundColor = ConsoleColor.Blue;
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine(name + " ==== " + ns);
CodeNamespace cns = new CodeNamespace("Msdn.Web.Services.Proxies");
cns.Imports.Add(new CodeNamespaceImport("Msdn.Web.Services"));
compileUnit.Namespaces.Add(cns);
Console.BackgroundColor = defaultBackground;
Console.ForegroundColor = defaultForeground;
return name;
}
return null;
}
}
}
Almost done with the blog posting for the WSE 3.0 custom policy assertion... very cool to code, hopefully the post will do it justice.
