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.

Answer 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));