[DataContract]
Base
{
[DataMember]
public int Id {get;set;}
}
[DataContract]
A : Base
{
[DataMember]
public string Value {get;set;}
}
[ServiceContract]
interface IService
{
[OperationContract]
void SetValue (Base base);
}
is there a way to use the service like the following style:
new Service ().SetValue (new A ());
You tagged this WCF so I assume you want to use it.
You need to connect to the endpoint using the ChannelFactory and then open the channel.
This will not work:
new Service ().SetValue (new A ());
You need to do smth. like this:
using (var scf = new ChannelFactory< IService >(<Binding>,<EndpointAddress>)
{
IService proxy = scf.CreateChannel();
proxy.SetValue(new (A));
}
This will return you a proxy object that implements the IService interface. You can call the SetValue on this object.
As well as changing the way you're calling the service as indicated by #Flo, you'll also need to make a small change to prepare the Data Contract Serializer to deal with the inheritance hierarchy.
The easiest way of doing this is decorating Base with the KnownTypeAttribute. Like this,
[DataContract]
[KnownType(typeof(A))]
Base
{
[DataMember]
public int Id {get;set;}
}
[DataContract]
A : Base
{
[DataMember]
public string Value {get;set;}
}
Related
I have a WCF Client, and the Endpoint has just been upgraded with a new method (OperationContract). I want to write a common method to handle the response from this new method as well as from the existing method at the endpoint.
I am trying to create a "Base" response class and adding common properties to it provided by the WCF endpoint, but I notice in my handler method, the properties are not being retained.
The code for the class I want all responses to inherit from looks like this :
public class ResponseBase
{
public string[] ItemsReturned;
public bool ItemsWereAvailable;
}
So I add partial declarations to get this onto the objects in the endpoint.
public partial class RetrieveResponse :ResponseBase
{
}
public partial class RetrieveResponse2 :ResponseBase
{
}
This way I have a handler method that just accepts "ResponseBase" as its input.
Am I doing this all wrong?
Any class whose instances will be return values and/or parameters of an operation contract should be decorated with the DataContract attribute, and the properties, as DataMembers:
[DataContract]
public class ResponseBase
{
[DataMember]
public string[] ItemsReturned { get; set; }
[DataMember]
public bool ItemsWereAvailable { get; set; }
}
http://msdn.microsoft.com/en-us/library/ms733127.aspx
If they are not, the DataContractSerializer doesn't serialize them.
I have a WCF operation contract which looks like this:
public void SavePersons(List<Person> list, bool IsSelected)
{
}
I am passing it a strongly typed list of Person objects (List<Person>) in my client. However, I am getting a bad request 400 message when calling the service. What am I doing wrong?
May I suggest you create you create a contract to encapsulate the parameters like so:
public void SavePersons(PersonCollectionContract Request)
{
...
}
[DataContract]
public class PersonCollectionContract
{
[DataContract]
public List<Person> People { get; set; }
[DataContract]
public bool IsSelected { get; set; }
}
[DataContract]
public class Person
{
...
}
I was facing a similar problem in passing a List<Health> of class Health type as a parameter to a wcf service method. I created a data contract in wcf service as below:
[DataContract]
public class Health
{
...
}
Defined a method in wcf service class such as:
public string GetData(List<Health> healthValues)
In my client application, while configuring/updating the service, I followed these steps:
Add/Update URL
Under Data Type (in Advanced), selected option, Collection type: System.Collection.Generic.List
And finally, I created a list and added the code in client as follows:
List<WcfService.Health> listHealth = new List<WcfService.Health>();
WcfService.Health h = new WcfService.Health();
.
.
listHealth.Add(h);
WcfService.Service1Client s = new WcfService.Service1Client();
string str = s.GetData(listHealth);
This solved my purpose and I was able to send the data as a list through wcf service.
I have a problem with serialization composite class (using WCF Service).
here my class in namespace1 (it is not in service namespace) :
[DataContract]
public class UpData
{
[DataMember]
public double Version ;
public UpData()
{
this.Version = -1;
}
}
In my Service namespace (in interface) I deŃlare this procedure :
ArrayList GetDownloadPath(Dictionary<string,string> lib1, Dictionary<string,string> lib2);
ArrayList contains UpData objects.
I have error(
How will be right to send ArrayList of UpData objects? (may be specific DataContract?)
Thanks a lot!
I'm not sure if ArrayList is serializable by default. Using a generic list could solve your problem:
[OperationContract]
List<UpData> GetDownloadPath(Dictionary<string,string> lib1, Dictionary<string,string> lib2);
EDIT: I think you also need to specify a getter and setter for your Version property, i.e.
[DataContract]
public class UpData
{
[DataMember]
public double Version { get; set; }
public UpData()
{
this.Version = -1;
}
}
More info here.
I have a WCF service where I am trying to return a List (where IWatchable is a custom interface I have built) in one of my operation contracts. When I test the service on the client the method returns an object[] instead of List<IWatchable>. Is it possible to return a List of IWatchable, since IWatchable is an interface with WCF?
Method:
public List<IWatchable> GetWorkload( Guid nodeId, int maximum )
IWatchable:
public interface IWatchable
{
string ActionName { get; set; }
Guid ActionReference { get; set; }
}
Hopefully a bit more info will be helpful...
I have a derived interface:
public interface IAMRAWatchable: IWatchable
And three concrete implementations from IAMRAWatchable:
public class InstrumentationWatch: IAMRAWatchable
public class OutputWatch: IAMRAWatchable
etc...
In my WCF method that returns List<IWatchable> I want to send an InstrumentationWatch and an OutputWatch to the client... Is this possible or am I going about this the wrong way?
Resolved
Thanks to John I found my solution. KnownType wasn't working since I was using List<IWatchable> - So I wrapped my list into a new class and added the attributes to it. I'll need to re-factor my code but for others who are interested here is the class:
[DataContract]
[KnownType( typeof( InstrumentationWatch ) )]
[KnownType( typeof( OutputWatch ) )]
public class WorkInfo
{
[DataMember]
public List<IWatchable> WorkQueue { get; set; }
}
and my WCF method:
public WorkInfo GetWorkload( Guid nodeId, int maximum )
An interface can never be serialized. It is only a description of behavior.
You can serialize objects which implement the interface, but you must tell WCF what their types are. See Data Contract Known Types.
I have a WCF service with a client application. I have complete control over both the client and server implementation. I have hundreds of methods in the WCF contract which need a piece of information supplied by the client. Instead of modifying hundreds of methods, is there a way I can send specific data from the client with every call to the service, possibly somewhere in the channel?
Maybe when the client is setting up the proxy before making the call, it can store this data somewhere in an internal property of the proxy... the data would then get sent to the server and from within the service method I could inspect the OperationContext or some other piece of memory to get this data back and use it?
Any ideas?
It sounds like you are wanting something like headers like with SOAP webservices. I'm not a WCF expert, but this looks like the WCF equivalent.
It shouldn't actually be that hard. The best way I can think of is to write an IClientMessageInspector that adds a SOAP header into the Message.Headers in its BeforeSendRequest method.
See e.g. http://weblogs.asp.net/paolopia/archive/2007/08/23/writing-a-wcf-message-inspector.aspx
You can't do this trivially. It will take some work.
It's true that SOAP Headers are the perfect way to pass out-of-band data to and/or from a service. But you already have your contract defined, and adding headers will change the contract.
I believe you'll have to start using message contracts.
Original:
[DataContract]
public class ComplexObject
{
[DataMember(Name = "Id")]
public int Id;
[DataMember]
public string Name;
}
[ServiceContract()]
public interface IMyContract
{
void MyOperation(ComplexObject co);
}
public class MyService : IMyContract
{
#region Implementation of IMyContract
public void MyOperation(ComplexObject co)
{
// use co.*
}
#endregion
}
Using Message Contracts:
[DataContract]
public class ComplexObject
{
[DataMember(Name = "Id")]
public int Id;
[DataMember]
public string Name;
}
[DataContract]
public class MyHeader
{
[DataMember]
public string UserName;
[DataMember]
public string Password;
}
[DataContract]
public class OutputHeader
{
[DataMember]
public string Token;
}
[MessageContract]
public class MyOperationRequest
{
[MessageHeader]
public MyHeader Authentication;
[MessageBodyMember]
public ComplexObject TheObject;
}
[MessageContract]
public class MyOperationResponse
{
[MessageHeader]
public OutputHeader OutputHeader;
}
[ServiceContract()]
public interface IMyContract
{
MyOperationResponse MyOperation(MyOperationRequest request);
}
public class MyService : IMyContract
{
public MyOperationResponse MyOperation(MyOperationRequest request)
{
// use request.TheObject.*
// Can also read request.Authentication.*
return new MyOperationResponse
{ OutputHeader = new OutputHeader { Token = "someToken" } };
}
}