I'm bit confused with how MessageContract Attribute works in WCF.
When I put the MessageContract the proxy shows two parameters instead of 1.
e.g.
GetResultResponse GetOperation(GetResultRequest request)
[MessageContract]
public class GetResultRequest
{
[MessageHeader]
public Header Header { get; set; }
[MessageBodyMember]
public List<Person> PersonList { get; set; }
}
The proxy generates this method signature:
GetOperation(ref Header, List<Person> personList)
When I remove MEssageContract Attributes:
Proxy Generates correct signatures:
GetOperation(GetResultRequest request)
Could anyone please confirm if this is the expected behavour?
That is default behavior. When you generate proxy it doesn't create message contracts by default. You can turn this on in advanced configuration in Add Service reference (by checking Always generate message contracts) or by /messageContract switch in svcutil. Once you turn it on you will get methods with single message contract parameter as you have on the service.
Unless you have the specific requirement to mark the header with the MessageHeader attribute, try to change the class attribute to Datacontract and your properties to DataMember attributes and see if the behaviour changes. As far as I know, unless you implement a custom serializer you cannot influence how svcutil will create your proxy.
Related
One of my WCF endpoints has this method:
GetData(DataTable dt)
I tried to create a class on the client that inherits from the DataTable class
public class ExtendedDataTable : DataTable{
//...implementation
}
and pass it along with the endpoint call:
GetData(new ExtendedDataTable());
Then I got the SerializationException. Accordingly to the error, it suggests that I use either DataContractResolver or the KnownType attribute.
I don't want to use the KnownType, because I shouldn't have to update the endpoint every time someone decides to inherit my DataContract. I can't write any DataContractResolver, because I didn't extend the exact structure of the DataTable class. Is it possible to to extend a DataContract from the client?
If so, what's the best practice?
Thanks!
I don't recommend using the Datatable, which makes it easy for WCF to have problems with client and server serialization, such as the need to specify a table name. It is best to use a custom data type, we can use the inheritance type with the KnownType attribute.
https://learn.microsoft.com/en-us/dotnet/framework/wcf/feature-details/data-contract-known-types
On my side, I can't use the inherited Datatable, while I could use an arbitrary custom class by using Knowntype attribute.
Please refer to my code segments.
[DataContract]
[KnownType(typeof(Product))]
public class MyData
{
[DataMember]
public ProductBase Product { get; set; }
}
[DataContract]
public class ProductBase
{
[DataMember]
public int ID { get; set; }
}
[DataContract]
public class Product : ProductBase
{
[DataMember]
public string Name { get; set; }
}
You can try to inherit DataTable and explicitly use DataContract attribute to declare it's name as "DataTable".
But I'm not sure about purpose of this replacement. Server side will see only what is related to original data contract. Even when new properties gets serialized, deserializatin will only work for server side properties. Unless some custom deserialization will be provided.
In all scenarios, using DataTable is not good idea at all as Abraham Qian already pointed out.
I am developing a wcf application which is taking c# request model as an input and returning complex response c# model after populating data in it from database. I am using SOAP UI client tool to test my service.
Earlier i had decorated my contract with XmlSerializerFormat attribute and after submitting request i was able to get the response in Result tab of SOAP UI tool. Below is the code snippet of it :
[ServiceContract]
[XmlSerializerFormat]
public interface IService1
{
[OperationContract]
Employee GetData(Employee value);
}
[DataContract]
public class Employee
{
[DataMember]
public int Id { get; set; }
[DataMember]
public string Name { get; set; }
public string Address { get; set; }
}
But now due to some reasons i have removed XmlSerializerFormat attribute from contract and i want default serializer to take care of it. But when i am submitting the request from client , my response model is populating with results but Response tab of SOAP UI shows empty response.
During Response model population when i am removing certain properties from response model, i am able to see result in response tab of SOAP UI tool.
Is Default serializer in facing some issues while serializing some of property of my model. Any other attribute apart from XmlSerializerFormat ?
Please let me know where i am lacking or is there any alternative of XmlSerializerFormat attribute.
Thnx in Advance
Try adding DataContract attribute to the Employee on the class level and DataMember attribute to its properties that you want to be serialized. If it has complex property types of its own they also may need to be decorated similarly. Default serializer in WCF is DataContract serializer FYI.
I have a question about the [DataContract] attribute.
I have written my code like below: here I am not using [DataContract] attribute for my test class.
class test
{
[Datamember]
public string Strproperty
{
get;
set;
}
[Datamemer]
public string Strproperty2
{
get;
set;
}
}
class checktotal:Iservice
{
public string testmethod(test obj)
{
return obj.Strproperty+Strproperty2;
}
}
For that I am sending data from client I am getting the values correctly.
Here is it necessary to use [DataContract] attribute for that test class?
If I removed [Datamember] for test class property is getting error while sending from client. But I am not getting any errors even if I am not using the [DataContract] attribute.
Please give me a brief explanation with example so that I can understand when to give that attribute and when do not give that attribute.
Thanks,
Satya Pratap.
The DataContractSerializer can deal with classes that do not have the DataContract attribute if they provide a default constructor. See the MSDN documentation for more details.
As of .NET 3.5 Service Pack 1, you can omit (not use) the [DataContract] and [DataMember] attributes. If you do that, then the DataContractSerializer in WCF will behave just like the XML serializer - it will serialize all public properties only.
I prefer to use [DataContract] and [DataMember] explicitly anyway - it gives me the opportunity to specify options (like the data contract's XML namespace, the order of the [DataMember]) and it lets me e.g. also exclude certain properties from serialization.
As soon as you start using [DataMember] on one property, then only those properties decorated with a [DataMember] will be looked at for the WCF serialization.
I have a domain service running smooth, some expose functions that return generic lists of defined entity, but for some reason, I had add some common information so I created a generic object to wrap the collection with the extra information that I need return.
but when after made the change and try use the service in the client, the function don't show up in the context, I already search about it and what I found was attributes for generic IQueryable
my wrap class
public class Wrap<T>
{
public String commonProperty { get; set; }
public String anotherCommonProperty { get; set; }
public List<T> items { get; set; }
}
in my service domain
public Wrap<SomeClass> GetAll()
{
Wrap<SomeClass> myObject = new Wrap<SomeClass>();
myObject.items = new List<SomeClass>();
myObject.commonProperty = "some info";
myObject.anotherCommonProperty = "some info";
return myObject;
}
Maybe adding the [KnownType(typeof(SomeClass))] attribute in the Wrap<T> class, the problem is that you need to include one KnowType attribute for every class in your domain (this is because you are making a polymorphic service).
And adding the [ServiceKnownType(typeof(SomeClass))] in the GetAll method in the service (this is for wcf services I don't know if is valid for domain services).
WCF RIA domain services does not support generic entity types. IEnumerable<T> and IQueryable<T> are special cases.
Your method was ignored because it did not match supported method type.
Before changes GetAll was recognized as Query method. You can force that by adding attribute.
[Query]
public Wrap<SomeClass> GetAll()
Now it does not dissapear silently. But generates compile time error instead:
Type 'Wrap`1' is not a valid entity type. Entity types cannot be
generic.
I have a WCF service and I'm sharing types with a client in a shared assembly.
If the client create a derived class will it be possible to pass back the derived type to the service so that I can read the added properties through reflection ?
I tried but having issues with KnownTypes since the service don't know how to deserialize the derived type.
[Serializable]
public abstract class Car : ICar
{........
//on the client :
[Serializable]
public class MyCar : Car
{......
when passing myCar to Service I get the exception complaining about knownType but I cant add this on the server since I wont know what the client will be sending through and I want to handle extra properties through reflection.
Possible to register client types as knowntypes at runtime ?
Is this maybe the solution ?
http://blogs.msdn.com/b/sowmy/archive/2006/03/26/561188.aspx
This is not possible. Both service and client has to know what types will be sent in messages. If you want to use known type you have to define that relation to parent type on the service.
Why do you need to know added properties on the server?
I think there is a way.
I vaguely remember that when I studied WCF, I met ExtensionData which should be a mechanism to get everything that does not match the serialization of the class. for example, if you enable ExtensionData and you are in this situation
//Server
public class GenericRQ
{
public string GenericProperty {get;set;}
}
public Service GenericService
{
Public void GenericMethod(GenericRQ RQ)
{
}
}
// client
Public class MoreSpecificRQ : GenericRQ
{
public string SpecificProperty {get;set;}
}
At
Public void GenericMethod(GenericRQ RQ)
{
// the serializer adds automatically in RQ.ExtensionData everything that has come and that does not match the class GenericRQ.
}
On how to enable ExtensionData you to easily search on the web