WCF interface as parameter

Question

I use the interface as an input parameter in OperationContract. But when I create a proxy class on the client side. I cannot access members of an interface or class implementing the ITransaction interface. I'm only geeting this object

• Service interface

  [ServiceContract] public interface IServiceInterface { [OperationContract] string SyncDatabase(ITransaction TransactionObject); } 

• Class of service

   class SyncService:IServiceInterface { public string SyncDatabase(ITransaction TransactionObject) { return "Hello There!!"; } } 

• Interface

   public interface ITransaction { ExpenseData ExpData { get; set; } void Add(ITransaction transactionObject); } 

• Data contract

   [DataContract] public class Transaction:ITransaction { [DataMember] public ExpenseData ExpData { get; set; } public void Add(ITransaction transactionObject) { } } 

In the above case, I should also copy the class and iTransaction interface to the client

Answer 1

Try making your [DataContract] interface and use the [KnownType] attribute to tell WCF what the known implementations of this interface are.

 [DataContract] [KnownType(typeof(Transaction))] public interface ITransaction { [DataMember] ExpenseData ExpData { get; set; } void Add(ITransaction transactionObject); } 

Answer 2

In fact, you need to tell ServiceContract about the implementation of the interface that you are passing as a parameter, so WCF will include it in the WSDL.

This should work:

 [ServiceContract] [ServiceKnownType(typeof(Transaction))] public interface IServiceInterface { [OperationContract] string SyncDatabase(ITransaction TransactionObject); } 

Answer 3

Use [KnownType(typeof(testClass))] .

Refer to the links:

• msdn.microsoft.com/en-us/library/ms730167.aspx
• www.codeproject.com/Tips/108807/Implementing-KnownType-Attribute