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POASMX not generating WSDL when using Custom IHttpHandlerFactory
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copied!<p>I am implementing a dynamic ASMX web service via a custom HttpHandler, and my web service has recently stopped generating WSDL automatically. When I use ?WSDL on the asmx url, I get the following error:</p> <pre><code>System.InvalidOperationException: XML Web service description was not found. at System.Web.Services.Protocols.DiscoveryServerProtocol.WriteReturns(Object[] returnValues, Stream outputStream) at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[] returnValues) at System.Web.Services.Protocols.WebServiceHandler.Invoke() </code></pre> <p>This worked fine a while ago, so I'm wondering if there's a file permission problem somewhere.</p> <p>A Google search does not return any reference to this particular situation.</p> <p>I doubt that my code is relevant to the problem; it has not changed:</p> <pre><code>[WebService(Description = "...", Namespace = "...")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [ToolboxItem(false)] public class MyWebService : System.Web.Services.WebService { [WebMethod] void MyWebMethod() {} } public class VirtualWebServiceFactory : IHttpHandlerFactory { public IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated) { WebServiceHandlerFactory wshf = new WebServiceHandlerFactory(); MethodInfo coreGetHandler = wshf.GetType().GetMethod("CoreGetHandler", BindingFlags.NonPublic | BindingFlags.Instance); IHttpHandler handler = (IHttpHandler)coreGetHandler.Invoke(wshf, new object[] { typeof(MyWebService), context, context.Request, context.Response }); return handler; } } </code></pre> <p>Decompiling System.Web.Services.Protocols.DiscoveryServerProtocol.WriteReturns() reveals that it looks up the XML service description in a dictionary created somewhere else.</p> <p>I was hoping that someone familiar with the DiscoverServerProtocol etc. might know under what circumstances the XML service description might fail to be built.</p> <p>The following works just fine:</p> <pre><code>ServiceDescriptionReflector reflector = new ServiceDescriptionReflector(); reflector.Reflect(typeof(MyWebService), "..."); </code></pre> <p>Navigating to MyWebService.asmx shows all the functions and allows testing them. But using ?WSDL gives the exception above.</p>

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