I'm building a workflow that uses a WCF service .. but in the workflow project I didn't add a direct reference to the WCF service, instead I've added a reference to a project that has this service reference, but now the designer isn't opening and it's giving me the following exception error:
System.Xaml.XamlObjectWriterException: 'The invocation of the constructor on type 'OrderingSystemWorkFlow.RegisterOrderBill' that matches the specified binding constraints threw an exception.' Line number '25' and line position '34'. ---> System.InvalidOperationException: Could not find default endpoint element that references contract 'ServiceReference1.IService1' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element.
How to solve this?
Why not add a direct Service Reference to your WF project?
When you add service reference of a wcf service in a activity library its turn into an activity and can drag drop on workflow. When you add service reference a config file is also added, copy the content of the config file basically that has a client and binding config section.
Please refer this link.
http://blogs.msdn.com/b/endpoint/archive/2010/12/08/how-to-consume-a-wcf-service-from-a-wf4-workflow.aspx.
Related
I have created a WCF service using Service Library template. Using the Service.dll generated, I have hosted the service in a console application.
However, when I add a Service Reference in my web project, on viewing the Service details in Object browser, it points to incorrect assembly in the object browser as shown in the screen shot below.
One possible issue could be that, while renaming the namespaces in my web project, I ended up renaming the namespace of Service project also. But even after fixing all the namespaces, I still have this issue.
Any ideas on what can be done to resolve it?
While adding a Service Reference, it displays the correct members/interfaces as shown in the screenshot below. Only when I view the Service Reference in the object browser, I don't see those interfaces exposed by the service.
Project dependencies of service project
Not sure why the web project is a dependency of the Service library project? It should not be as I have not added any reference to it in the Service project.
I came across this question here after researching on this issue.
I also found out that the reference.cs file was empty in my case also. After unchecking Reuse types in referenced assemblies from 'Configure Service Reference' dialog, I was able to generate the Service reference client code successfully. My Service reference is now pointing to the correct Interface/members. In case of any queries, feel free to comment or contact me directly.
I use a wsdl file to generate web service with the help of svcutil but it generates class instead of simple int or string parameter for the service contract.
What I did:
I created a WCF Service Application
I created a Console Application then added the service reference to the project
I used svcutil.exeto generate service from thy wsdl and xsd files in console project
Why does it do that and how I can rewrite the wsdl to solve this problem, please?
Most likely you used /messageContract switch in svcutil.
If you added service via service reference, then right click on service->configure service reference and uncheck Always generate message contracts
I am working on a Base WCF Service- Client WCF service - Consumer Base Wcf servcie model as following:
In this model, I have created a Base WCF service and created 1 WCF service i.e; ClientWCFService and 1 ASMX service i.e; ClientASMXservice using the BaseWCFServiceProxy.cs the Proxy class of Base WCF Service using SVCUtil.exe.
The ClientWCFService and ClientASMXservice are working fine in StandAlone environment.
Now, I created a Consumer Console Application using the same proxy class BaseWCFServiceProxy.cs to access both of the ClientWCFService and ClientASMXservice using the BaseWcfService class.
As per the OOP rules, BaseWcfService class is the base class for the ClientWCFService and ClientASMXservice and i can access these Services using the Base service class constructor.
The service calls are as following:
for ClientWCFService
ModelWcfServiceContractClient _client = new ModelWcfServiceContractClient("IModelWcfServiceContract","http://localhost:64242/ClientWCFServiceWcfUsingSVCProxy.svc");
for ClientASMXservice
ModelWcfServiceContractClient _client = new ModelWcfServiceContractClient("IModelWcfServiceContract","http://localhost:64396/ClientASMXServiceWcfUsingSVCProxy.asmx");
The Consumer Console application is building fine, but at run time while initializing the ModelWCFServiceContractClient object,
it throws the InvalidOperation Exception as :
Could not find endpoint element with name 'IModelWcfServiceContract'
and contract 'IModelWcfServiceContract' in the ServiceModel client
configuration section. This might be because no configuration file was
found for your application, or because no endpoint element matching
this name could be found in the client element.
I have tried using different endpoints for every type of service to resolve this issue but could not get success.
A faster response would be Appreciated. Also please don't help me by just clearing spelling mistakes because it will waste my time to read the Alert that would be generated due to the clearing spell mistakes. Time is critical for me..
Thanks
Try this (hopefully you can follow):
In Visual Studio, Select the project that contains the ServiceReference for your ModelWcfProxy (the one that generated the ModelWcfServiceContractClient proxy class).
Choose, "Show all files" from the Solution Explorer menu bar.
Expand the Service References folder and the generated Service Reference. Find the .svcmap file, look underneath to find the Reference.cs file.
On the top of your generated interface there should be a System.ServiceModel.ServiceContractAttribute defined. In the attribute constructor, you should see a ConfigurationName property being set. This contract configuration name should match the name defined in config or that you are sending in to your method:
ModelWcfServiceContractClient _client = new ModelWcfServiceContractClient("IModelWcfServiceContract","http://localhost:64242/ClientWCFServiceWcfUsingSVCProxy.svc");
Hope this helps.
When I add a service reference to a WCF web service in my current ASP.net MVC 3 project, proxy classes are successfully generated, but there's no information added to web.config. This results in an error when I attempt to instantiate the proxy class using the no-args constructor. On this line:
var proxy = new ReportingService.ApiServiceClient();
I get the following runtime exception:
Could not find default endpoint element that references contract
'ReportingService.IApiService' in the ServiceModel client configuration
section. This might be because no configuration file was found for your
application, or because no endpoint element matching this contract could
be found in the client element.
This makes sense because there's absolutely nothing in my config file indicating the default endpoint.
What am I missing? Why would adding the service reference fail to create a default endpoint?
I am trying to consume a WCF web service from a .NET client application, and I think I need to be able to programmatically create endpoints, but I don't know how. I think I need to do this because, when I try to run the application, I am getting the following error:
Could not find default endpoint
element that references contract
'IEmailService' in the ServiceModel
client configuration section. This
might be because no configuration file
was found for your application, or
because no endpoint element matching
this contract could be found in the
client element.
While troubleshooting this error, I created a simple windows forms application, in which I try to consume the same web service. With this test application I can connect to the web service successfully, and I get a valid response. But, I can reproduce the exact error cited above within in my test app by removing the system.serviceModel node and all of its child nodes from the application's app.config file (I might not have to remove ALL of that section, I'm not sure). So, my first thought was that I need to add that section to the app.config file for the real app, and everything should be fine. Unfortunately, for ridiculous reasons that I won't get into here, that is not an option. So, I am left with having to generate this information in code, inside the client app.
I am hoping someone here can help me work through this, or can point me toward a good resource for this sort of problem.
Is it possible to create endpoint configurations in the client app, in code?
By default, when you do an Add Service Reference operation, the WCF runtime will generate the client-side proxy for you.
The simplest way to use it is to instantiate the client proxy with a constructor that takes no parameters, and just grab the info from the app.config:
YourServiceClient proxy = new YourServiceClient();
This requires the config file to have a <client> entry with your service contract - if not, you'll get the error you have.
But the client side proxy class generated by the WCF runtime also has additional constructors - one takes an endpoint address and a binding, for instance:
BasicHttpBinding binding = new BasicHttpBinding(SecurityMode.None);
EndpointAddress epa = new EndpointAddress("http://localhost:8282/basic");
YourServiceClient proxy = new YourServiceClient(binding, epa);
With this setup, no config file at all is needed - you're defining everything in code. Of course, you can also set just about any other properties of your binding and/or endpoint here in code.
An east way to consume a WCF service if you have a reference to the assembly which defines the interface, is using the System.ServiceModel.ChannelFactory class.
For example, if you would like to use BasicHttpBinding:
var emailService = ChannelFactory<IEmailService>.CreateChannel(new BasicHttpBinding(), new EndpointAddress(new Uri("http://some-uri-here.com/));
If you don't have a reference to the service assembly, then you can use one of the overloaded constructors on the generated proxy class to specify binding settings.