WCF服务创建单独的代理类

Question

I have a WCF service method that sends back a MembershipCreateStatus ( System.Web.Security ) to the calling method. When I look at the service definition it has recreated the enum as a type of MyProject.MyWebService.MembershipCreateStatus so it is essentially a completely different object.

Is there a way in which I can tell the service definition to use the System.Web.Security class instead, even though it is this within the WCF service?

Answer 1

You you can. You need to use the KnownTypeAttribute class to decorate the DataContract in your WCF Service to specify that the enum is of type System.Web.Security.MembershipCreateStatus I'm not aware of the details of your environment but in general unless you control both the WCF service and the consuming clients, I would carefully research the support requirements and the possibility of a future change to the enum causing backwards compatibility issues with clients that are consuming this enum. Also to consider is a scenario where a non .NET client could consume your WCF service. In that case you need to consider if using the System.Web.Security.MembershipCreateStatus enum is a good idea versus implementing your own statuses for Member creation. Here is another question on StackOverflow with a good discussion on this topic.

For example see the following code below

[ServiceContract]
public interface IMembershipService
{
    [OperationContract]
    CreateMemberResponse CreateMember(ApplicationUser userToCreate);
}

[DataContract]
[KnownType(typeof(System.Web.Security.MembershipCreateStatus))]
public class CreateMemberResponse
{
    [DataMember]
    public MembershipCreateStatus Status { get; set; }
}

[DataContract]
public class ApplicationUser
{
    public bool ReturnSuccess { get; set; }

    public ApplicationUser()
    {
        ReturnSuccess = true;
    }
}

You can write a test against this service as follows and this test will succeed.

[TestClass]
public class MembershipStatusInvocationTests
{
    [TestMethod]
    public void CreateMemberShouldReturnMembershipCreateStatusEnum()
    {
        var client = new MembershipServiceClient();
        var response = client.CreateMember(new ApplicationUser {ReturnSuccess = true});

       Assert.IsInstanceOfType(response.Status, typeof(System.Web.Security.MembershipCreateStatus));
    }
}

For more information on the KnownTypeAttribute class see here