Argument Exception was unhandled (Entity Framework, WCF)

Question

I have created one basic WCF Service. It thrown an exception at line shown below.

  ServiceHost host = new ServiceHost(typeof(MyApplication.ITransactionService1));

An unhandled exception of type 'System.ArgumentException' occurred in System.ServiceModel.dll Additional information: ServiceHost only supports class service types.

I think you need to pass something like typeof(MyApplication.ConcreteTransactionService) It looks like you are getting the type of an interface and not the implementation. — Brian Kraemer
– Brian Kraemer, Commented Feb 11, 2016 at 17:44
@mike just an interface that's it.. public interface ITransactionService1 { [OperationContract] [FaultContract(typeof(MyException))] [TransactionFlow(TransactionFlowOption.Allowed)] void InsertData(int id, string name); } public class MyException { [DataMember] public string ErrorText { get; set; } } — deshaware_swap
– deshaware_swap, Commented Feb 11, 2016 at 17:58

Tim · Accepted Answer · 2016-02-11 17:58:29Z

1

The ServiceHost Constructor (Type, Uri[]) expects a concrete type, not an interface.

Assuming that ITransactionService1 is your service contract and that you've implemented it in TransactionService1:

namespace MyApplication
{

    [ServiceContract]
    public interface ITransactionService1
    {

        [OperationContract]
        int DoSomething(string arg);
    }

    public class TransactionService1 : ITransactionService1
    {

        // Implementation logic
    }
}

You would than pass MyApplication.TransactionService1:

ServiceHost host = new ServieHost(typeof(MyApplication.TransactionService1));

answered Feb 11, 2016 at 17:58

Tim

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2 Comments

deshaware_swap Over a year ago

It Worked.. Thank you :)

oleksa Over a year ago

this raises TransactionService1 is not attributed with ServiceContractAttribute error. And requires to move ServiceContract from interface to TransactionService1 class definition.

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