WCF继承和动态CreateChannel

Question

I have an issues on ihneritance on service when i called a dynamic ChannelFactory .

The structure of my project : I have a class ServiceBase and an interface IServiceBase that is used in all WCF Service and Contract (2 separate projects).

IServiceBase

Imports System.ServiceModel

<ServiceContract()>
Public Interface IServiceBase

    ''' <summary>
    ''' Ping.
    ''' </summary>
    ''' <returns>Vrai.</returns>
    <OperationContract()>
    Function Ping() As Boolean
End Interface

ServiceBase

Public Class ServiceBase
    Implements IDisposable, IServiceBase

#Region "IServiceBase"

    ''' <summary>
    ''' Ping.
    ''' </summary>
    ''' <returns>
    ''' Vrai.
    ''' </returns>
    Public Function Ping() As Boolean Implements IServiceBase.Ping
        Return True
    End Function

#End Region
End Class

All IFoo inherit from IServiceBase . All Foo ihnerit from ServiceBase and implement IFoo .

---

I have a TestController (client-side) that load all assembly of contracts to parse if it is alive.

So I take assembly by the type of one of my contracts (working well)

 Dim common As Assembly = Assembly.GetAssembly(GetType(Firma.Project.Services.Contracts.ICommon))

For each of them I determine if it's an interface and if it derived from IServiceBase (working well, but only with IsAssignableFrom , GetMethod don't return Ping from derived interface (works only with class)).

For Each ty As Type In common.GetTypes
                If ty.IsInterface AndAlso GetType(IServiceBase).IsAssignableFrom(ty) Then 
                    Try
                        Dim myInterfaceType As Type = ty

                        Dim value As String = String.Empty
                        If Not _dicEndPoints.TryGetValue(ty.FullName, value) Then
                            Continue For
                        End If

From this, I create dynamically my channel (seems working, i see well ChannelFactory<IFoo>(endpointname) in debug step)

                ' Type ChannelFactory<>.
                Dim factoryType = GetType(ChannelFactory(Of )).MakeGenericType(myInterfaceType)
                ' Constructeur ChannelFactory<IFoo>(endpointname)
                Dim factoryCtr = factoryType.GetConstructor(New Type() {GetType(String)})
                ' Invoke dynamic ChannelFactory<IFoo>(endpointname)
                Dim factory = factoryCtr.Invoke(New Object() {value})
                ' dynamic Create Channel 
                Dim channel = factory.CreateChannel()

But when I call the method Ping , it doesn't work

Dim retour As Object = channel.Ping() 

I've got "public method Ping is not found". Another method declared directly in Foo class are working and the method Ping is working well when I used Client Test WCF on IFoo Service. So it mean that dynamic create of ChannelFactory is the issue, but I don't see how to make this.

Edit: answer can be translated in C# and response can be given in C#

Thanks for your helps.

Answer 1

Try this. I'm assuming myInterfaceType is your interface implementing IServiceBase, and value is your endpoint name in your WCF config

class Program
{
    static void Main(string[] args)
    {

        var factoryType = typeof(MyChannelFactory).GetMethod("CreateProxyChannel", BindingFlags.Static | BindingFlags.Public);

        var generic = factoryType.MakeGenericMethod(myInterfaceType);

        var result = generic.Invoke(null, new[] { value});

        var channel = (IServiceBase) result;

        var check = channel.Ping();
    }

}

class MyChannelFactory
{
    public static T CreateProxyChannel<T>(string endpointName)
    {
        ChannelFactory<T> factory = new ChannelFactory<T>(endpointName);

        return factory.CreateChannel();
    }
}