WCF回调生成的接口

Question

.NET Framework 3.5。在服务器端，我有一个接口

public interface IClientCallback
{
    [OperationContract(IsOneWay = true)]
    void ReceiveBroadcast(string nickname, string message);

    [OperationContract(IsOneWay = true)]
    void ReceivePrivate(string nickname, string message);

    [OperationContract(IsOneWay = true)]
    void UserJoined(string nickname);

    [OperationContract(IsOneWay = true)]
    void UserLeft(string nickname);
}

使用svcutil我已经生成了folliwing接口

public interface IServerCallback
{

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://tempuri.org/IServer/ReceiveBroadcast")]
    void ReceiveBroadcast(string nickname, string message);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, AsyncPattern=true, Action="http://tempuri.org/IServer/ReceiveBroadcast")]
    System.IAsyncResult BeginReceiveBroadcast(string nickname, string message, System.AsyncCallback callback, object asyncState);

    void EndReceiveBroadcast(System.IAsyncResult result);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://tempuri.org/IServer/ReceivePrivate")]
    void ReceivePrivate(string nickname, string message);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, AsyncPattern=true, Action="http://tempuri.org/IServer/ReceivePrivate")]
    System.IAsyncResult BeginReceivePrivate(string nickname, string message, System.AsyncCallback callback, object asyncState);

    void EndReceivePrivate(System.IAsyncResult result);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://tempuri.org/IServer/UserJoined")]
    void UserJoined(string nickname);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, AsyncPattern=true, Action="http://tempuri.org/IServer/UserJoined")]
    System.IAsyncResult BeginUserJoined(string nickname, System.AsyncCallback callback, object asyncState);

    void EndUserJoined(System.IAsyncResult result);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://tempuri.org/IServer/UserLeft")]
    void UserLeft(string nickname);

    [System.ServiceModel.OperationContractAttribute(IsOneWay=true, AsyncPattern=true, Action="http://tempuri.org/IServer/UserLeft")]
    System.IAsyncResult BeginUserLeft(string nickname, System.AsyncCallback callback, object asyncState);

    void EndUserLeft(System.IAsyncResult result);
}

如您所见，它提供了End *和Begin *方法，尽管所有操作都是单向的。可能是什么原因？我尝试将AsyncPattern = false添加到IClientCallback方法，但没有结果。