Uzyskiwanie niepoprawnego błędu typu zwracanego podczas próby wywołania usługi WWW WCF 4.0
Próbuję napisać i wywołać serwis WWW WCF, poniżej znajdują się szczegóły:
Web.config:
<add relativeAddress="FetchData.svc" service="WCF.Services.FetchData" />
<service name="WCF.Services.FetchData">
<endpoint address="" binding="webHttpBinding" bindingConfiguration="" name="FetchData" contract="WCF.Services.FetchData" />
</service>
Klasa FetchData (przykładowy kod):
using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.Web;
using System.Xml;
using Webservices.Services;
using Data = Webservices.Data;
using System.ServiceModel.Web;
using System.IO;
using System.Net;
using System.ServiceModel.Channels;
using System.Web.UI;
using System.Text;
namespace WCF.Services
{
[ServiceContract(Namespace = "urn:WCF.Services.FetchData")]
public class FetchData
{
Data.GetConnect mConnect = new Data.GetConnect();
private Message RetrievePublishedData(String pub, int number)
{
String strOutput = String.Empty;
if (!String.IsNullOrEmpty(pub))
{
Boolean pubURLExists = mConnect.CheckPubUrlExists(pub);
if (!pubURLExists)
{
WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.NotFound;
return WebOperationContext.Current.CreateTextResponse(String.Format("Requested publication '{0}' is not available.", pub), MimeTypes.TextPlain, Encoding.UTF8);
}
using (StringWriter sw = new StringWriterEncoding())
{
using (HtmlTextWriter hw = new HtmlTextWriter(sw))
{
hw.RenderBeginTag(HtmlTextWriterTag.Html);
XmlNode publishedData = mConnect.GetPublishedData(pub, number);
hw.RenderEndTag();
}
return WebOperationContext.Current.CreateTextResponse(sw.ToString(),MimeTypes.TextHTML, Encoding.UTF8);
}
}
return WebOperationContext.Current.CreateTextResponse(strOutput, MimeTypes.TextHTML, Encoding.UTF8);
}
[OperationContract]
[WebGet(UriTemplate = "/published/{number}/{*pub=default}")]
public Message FetchPublished(String pub, int number)
{
return RetrievePublishedData(pub, number);
}
}
}
Teraz, gdy próbuję przeglądać serwis internetowy, otrzymuję poniżej błąd:
Adres URL usługi sieci Web -http://localhost:8082/FetchData.svc
Błąd: Operacja „FetchPublished” nie mogła zostać załadowana, ponieważ ma parametr lub typ zwracany typu System.ServiceModel.Channels.Message lub typ, który ma MessageContractAttribute i inne parametry różnych typów. Używając System.ServiceModel.Channels.Message lub typy z MessageContractAttribute, metoda nie może używać żadnych innych typów parametrów.
Edytować:
namespace WCFWebServices
{
[ServiceBehavior(AddressFilterMode = AddressFilterMode.Any)]
[ServiceContract(Namespace = "urn:WCFWebServices.fetchPush")]
public class FetchData
{
[MessageContract]
public class RetrievePublishedDataInput
{
[MessageBodyMember]
public String pub;
[MessageBodyMember]
public String number;
}
private Message RetrievePublishedData(RetrievePublishedDataInput input)
{
String strOutput = String.Empty;
String pub = input.pub;
String number = input.number;
if (!String.IsNullOrEmpty(pub))
{
Boolean pubURLExists = true;
if (!pubURLExists)
{
WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.NotFound;
return WebOperationContext.Current.CreateTextResponse(String.Format("Requested publication '{0}' is not available.", pub), "application/plain; charset=utf-8", Encoding.UTF8);
}
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter hw = new HtmlTextWriter(sw))
{
hw.RenderBeginTag(HtmlTextWriterTag.Html);
hw.RenderEndTag();
}
return WebOperationContext.Current.CreateTextResponse(sw.ToString(), "application/html; charset=utf-8", Encoding.UTF8);
}
}
return WebOperationContext.Current.CreateTextResponse(strOutput, "application/html; charset=utf-8", Encoding.UTF8);
}
[OperationContract]
[WebGet(UriTemplate = "/publishedData/{number}/{pub=default}")]
public Message FetchPublished(RetrievePublishedDataInput input)
{
return RetrievePublishedData(input);
}
}
}