双工服务引用将接口类型转换为system.object类型(Duplex service reference converts interface type to system.object type)

 这是我的wcf双工服务回调接口： 
 
public interface ICallback
{
    [OperationContract(IsOneWay = true)]
    void SendClientCallback(CallbackMessage callbackMessage);

    [OperationContract]
    void GetTemplateList(ref List<ISpecimenTemplateDescriptor> templateDescriptors, IDrawerLayout drawerLayout);
}
 
 我配置我的服务引用以使用System.Collections.Generic.List类型。 我通过右键单击服务引用，选择配置服务选项以及更改集合类型来完成此操作。 这将服务引用配置为使用List的集合类型，而不是默认的Array类型。 
 
 当我编译并更新我的服务引用时，我的接口类型“ISpecimenTemplateDescriptor”和“IDrawerLayout”将转换为“System.Object”，如下所示： 
 
void GetTemplateList(ref System.Collections.Generic.List<object> templateDescriptors, object drawerLayout);
 
 为什么我的接口对象在服务引用中转换为System.Object？ 
 
 这是我的服务合同： 
 
[ServiceContract(SessionMode = SessionMode.Required, CallbackContract = typeof(ICallback))]
public interface IWcfService
{
      .....
}
 
 以下是我的服务行为： 
 
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Reentrant, UseSynchronizationContext = false)]
public class WcfService : IWcfService
{
    ......
}
 
 感谢您的帮助！ 

Here is my wcf duplex service callback interface:
 
public interface ICallback
{
    [OperationContract(IsOneWay = true)]
    void SendClientCallback(CallbackMessage callbackMessage);

    [OperationContract]
    void GetTemplateList(ref List<ISpecimenTemplateDescriptor> templateDescriptors, IDrawerLayout drawerLayout);
}
 
I configured my service reference to use the System.Collections.Generic.List type. I did this by right clicking on the service reference, selecting the configure service option, and changing the Collection type. This configured the service reference to use a collection type of List, instead of the default Array type.
 
When I compile and update my service reference, my interface type "ISpecimenTemplateDescriptor" and "IDrawerLayout" are converted to "System.Object" as shown below:
 
void GetTemplateList(ref System.Collections.Generic.List<object> templateDescriptors, object drawerLayout);
 
Why are my interface objects converted to System.Object in the service reference?
 
Here is my service contract:
 
[ServiceContract(SessionMode = SessionMode.Required, CallbackContract = typeof(ICallback))]
public interface IWcfService
{
      .....
}
 
Here are my service behaviors:
 
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Reentrant, UseSynchronizationContext = false)]
public class WcfService : IWcfService
{
    ......
}
 
Thanks for your help in advance!

原文：https://stackoverflow.com/questions/13634297