Re: The namespace, , is a duplicate error when compiling .NET Webservice

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"UT-BadBoy" <utnemisis51@xxxxxxxxx> wrote in message news:1190828782.560606.181160@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Sep 26, 12:37 pm, "John Saunders [MVP]" <john.saunders at
trizetto.com> wrote:
"UT-BadBoy" <utnemisi...@xxxxxxxxx> wrote in message

news:1190825506.092504.289160@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx





> Hi,

> I've been receving this error "System.InvalidOperationException: The
> namespace, , is a duplicate." and have been unable to locate the exact
> cause of the exception.

> I've written a webservice with the new AJAX extensions for .NET. The
> webservice is marked up with
> a ScriptService attribute tag along with each method being marked up
> as a ScriptMethod.
> Calls from the my client to the webservice still works correctly but I
> get an error if I try to hit the webservice page directly. So during
> compile time, there is something going on that's preventing IIS from
> displaying the webservice page.

> Any help will be much appreciated.

> Thanks in Advance.

> Here's some code sample of the webservice:

> [WebService( Namespace="mynamespace" )]
> [WebServiceBinding( ConformsTo=WsiProfiles.BasicProfile1_1 )]
> [GenerateScriptType( typeof( CustomItem ) ) ]
> [ScriptService]
> public class MyWebService : System.Web.Services.WebService
> {
> [WebMethod]
> [ScriptMethod( ResponseFormat = ResponseFormat.Xml)]
> public CustomItem CreateNewItem(string name)
> {
> // do stuff here
> return new CustomItem();
> }
> }

Please post the entire exception, complete with stack trace and inner
exceptions. If necessary, write out ex.ToString().
--
---------------------------------------------------------------------------­-----
John Saunders | MVP - Windows Server System - Connected System Developer- Hide quoted text -

- Show quoted text -

Here's the full exception throw by IIS:

------]
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The namespace, ,
is a duplicate.


[InvalidOperationException: The namespace, , is a duplicate.]

System.Xml.Serialization.XmlSchemaExporter.ExportSpecialMapping(SpecialMapping
mapping, String ns, Boolean isAny, XmlSchemaElement element) +762724

System.Xml.Serialization.XmlSchemaExporter.ExportRootIfNecessary(TypeScope
typeScope) +298

System.Xml.Serialization.XmlSchemaExporter.ExportMembersMapping(XmlMembersMapping
xmlMembersMapping, Boolean exportEnclosingType) +416

System.Web.Services.Description.SoapProtocolReflector.CreateLiteralMessage(Message
message, MessageBinding messageBinding, XmlMembersMapping members,
Boolean wrapped, Boolean rpc) +465

System.Web.Services.Description.SoapProtocolReflector.CreateMessage(Boolean
rpc, SoapBindingUse use, SoapParameterStyle paramStyle, Message
message, MessageBinding messageBinding, XmlMembersMapping members)
+103

System.Web.Services.Description.SoapProtocolReflector.ReflectMethod()
+360

System.Web.Services.Description.ProtocolReflector.ReflectBinding(ReflectedBinding
reflectedBinding) +2760
System.Web.Services.Description.ProtocolReflector.Reflect() +739

System.Web.Services.Description.ServiceDescriptionReflector.ReflectInternal(ProtocolReflector[]
reflectors) +621

System.Web.Services.Description.ServiceDescriptionReflector.Reflect(Type
type, String url) +117
System.Web.Services.Protocols.DocumentationServerType..ctor(Type
type, String uri) +159

System.Web.Services.Protocols.DocumentationServerProtocol.Initialize()
+336
System.Web.Services.Protocols.ServerProtocolFactory.Create(Type
type, HttpContext context, HttpRequest request, HttpResponse response,
Boolean& abortProcessing) +99

[InvalidOperationException: Unable to handle request.]
System.Web.Services.Protocols.ServerProtocolFactory.Create(Type
type, HttpContext context, HttpRequest request, HttpResponse response,
Boolean& abortProcessing) +258

System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type
type, HttpContext context, HttpRequest request, HttpResponse response)
+90

[InvalidOperationException: Failed to handle request.]

System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type
type, HttpContext context, HttpRequest request, HttpResponse response)
+237

System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext
context, String verb, String url, String filePath) +104

System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext
context, String requestType, String url, String pathTranslated) +127
System.Web.HttpApplication.MapHttpHandler(HttpContext context,
String requestType, VirtualPath path, String pathTranslated, Boolean
useAppConfig) +175

System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+120
System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously) +155

------ end
------------------------
This message seems to be coming from the server when it tries to serialize the CustomItem being returned. It appears to have something to do with processing the root of the serialized XML. You should take a look at your attributes on the CustomItem class and its members.

If that doesn't help you, then please post your CustomItem class.
--
--------------------------------------------------------------------------------
John Saunders | MVP - Windows Server System - Connected System Developer

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