C# 多个WPF控件使用的WCF双工服务

我正在开发一个使用服务器应用程序（WPF）托管的WCF服务的MVVM WPF应用程序。我对使用该服务的最佳方式有一些疑问，因为我知道：

服务的InstanceContextMode设置为Single

WCF服务使用带有回调的双工协定

主窗口定期调用服务的“Ping”方法，以了解（并以图标直观显示）服务是否可用。MainWindow实现PingReply回调以获取回复

主窗口有一个用于加载不同页面的框架。每个页面都包含几个用户控件，这些控件调用服务来更新其视图

这是简化的服务接口ISrvService.cs

[ServiceContract(CallbackContract = typeof(ISrvServiceCallback))]
public interface ISrvService
{
    [OperationContract(IsOneWay = true)]
    void Ping();

    [OperationContract(IsOneWay = true)]
    void GetUserControlAStatus();

    [OperationContract(IsOneWay = true)]
    void GetUserControlBStatus();
}

public interface ISrvServiceCallback
{
    [OperationContract(IsOneWay = true)]
    void PingReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);
}

    public void GetUserControlAReply(string reply)
    {
        //nothing to do
    }

public class UserControlAModel: INotifyPropertyChanged, SrvService.ISrvServiceCallback
{
    System.ServiceModel.InstanceContext instanceContext;
    SrvService.SrvServiceClient client;

    public event PropertyChangedEventHandler PropertyChanged;

    private string _Status;
    public string Status
    {
        get { return _Status; }
        set { _Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAModel()
    {
        Status = "NOT CONNECTED";
    }

    public void GetStatus()
    {
        instanceContext = new System.ServiceModel.InstanceContext(this);
        client = new SrvService.SrvServiceClient(instanceContext);
        client.GetUserControlAStatus();
    }

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    //callbacks implementation
    public void GetUserControlAReply(string reply)
    {
        Status = reply;
    }

    public void GetUserControlBReply(string reply)
    {
        //nothing to do
    }

    public void PingReply(string reply)
    {
        //nothing to do
    }
}

public class UserControlAViewModel : INotifyPropertyChanged
{
    private UserControlAModel _uControlAModel;
    public UserControlAModel MyUserControlAModel
    {
        get
        { return _uControlAModel; }
        set
        { _uControlAModel = value; NotifyPropertyChanged(); }
    }

    public string LblStatus
    {
        get { return MyUserControlAModel.Status; }
        set { MyUserControlAModel.Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAViewModel()
    {
        MyUserControlAModel = new UserControlAModel();
        MyUserControlAModel.PropertyChanged -= UserControlAModel_PropertyChanged;
        MyUserControlAModel.PropertyChanged += UserControlAModel_PropertyChanged;

        MyUserControlAModel.GetStatus();
    }

    private void UserControlAModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        NotifyPropertyChanged(string.Empty);
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

这样，当我在MainWindow中实现ISrvServiceCallback接口以实现PingReply回调时，我还需要实现GetUserControlAReply和GetUserControlBReply（现在我只是实现它们，没有代码）

GetUserControlAReply在main window.xaml.cs中

[ServiceContract(CallbackContract = typeof(ISrvServiceCallback))]
public interface ISrvService
{
    [OperationContract(IsOneWay = true)]
    void Ping();

    [OperationContract(IsOneWay = true)]
    void GetUserControlAStatus();

    [OperationContract(IsOneWay = true)]
    void GetUserControlBStatus();
}

public interface ISrvServiceCallback
{
    [OperationContract(IsOneWay = true)]
    void PingReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);
}

    public void GetUserControlAReply(string reply)
    {
        //nothing to do
    }

public class UserControlAModel: INotifyPropertyChanged, SrvService.ISrvServiceCallback
{
    System.ServiceModel.InstanceContext instanceContext;
    SrvService.SrvServiceClient client;

    public event PropertyChangedEventHandler PropertyChanged;

    private string _Status;
    public string Status
    {
        get { return _Status; }
        set { _Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAModel()
    {
        Status = "NOT CONNECTED";
    }

    public void GetStatus()
    {
        instanceContext = new System.ServiceModel.InstanceContext(this);
        client = new SrvService.SrvServiceClient(instanceContext);
        client.GetUserControlAStatus();
    }

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    //callbacks implementation
    public void GetUserControlAReply(string reply)
    {
        Status = reply;
    }

    public void GetUserControlBReply(string reply)
    {
        //nothing to do
    }

    public void PingReply(string reply)
    {
        //nothing to do
    }
}

public class UserControlAViewModel : INotifyPropertyChanged
{
    private UserControlAModel _uControlAModel;
    public UserControlAModel MyUserControlAModel
    {
        get
        { return _uControlAModel; }
        set
        { _uControlAModel = value; NotifyPropertyChanged(); }
    }

    public string LblStatus
    {
        get { return MyUserControlAModel.Status; }
        set { MyUserControlAModel.Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAViewModel()
    {
        MyUserControlAModel = new UserControlAModel();
        MyUserControlAModel.PropertyChanged -= UserControlAModel_PropertyChanged;
        MyUserControlAModel.PropertyChanged += UserControlAModel_PropertyChanged;

        MyUserControlAModel.GetStatus();
    }

    private void UserControlAModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        NotifyPropertyChanged(string.Empty);
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

在UserControlA模型中实现ISrvServiceCallback接口时也会发生同样的情况：我必须在没有代码的情况下实现PingReply

我认为这不是一个好的合作方式。解决此类问题的最佳实践是什么？你能给我推荐一些关于这种情况的教程吗

编辑 正如@lokusking所建议的，我提供了UserControl示例的Model和ViewModel。视图绑定到ViewModel的LblStatus

UserControlAModel.cs

[ServiceContract(CallbackContract = typeof(ISrvServiceCallback))]
public interface ISrvService
{
    [OperationContract(IsOneWay = true)]
    void Ping();

    [OperationContract(IsOneWay = true)]
    void GetUserControlAStatus();

    [OperationContract(IsOneWay = true)]
    void GetUserControlBStatus();
}

public interface ISrvServiceCallback
{
    [OperationContract(IsOneWay = true)]
    void PingReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);
}

    public void GetUserControlAReply(string reply)
    {
        //nothing to do
    }

public class UserControlAModel: INotifyPropertyChanged, SrvService.ISrvServiceCallback
{
    System.ServiceModel.InstanceContext instanceContext;
    SrvService.SrvServiceClient client;

    public event PropertyChangedEventHandler PropertyChanged;

    private string _Status;
    public string Status
    {
        get { return _Status; }
        set { _Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAModel()
    {
        Status = "NOT CONNECTED";
    }

    public void GetStatus()
    {
        instanceContext = new System.ServiceModel.InstanceContext(this);
        client = new SrvService.SrvServiceClient(instanceContext);
        client.GetUserControlAStatus();
    }

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    //callbacks implementation
    public void GetUserControlAReply(string reply)
    {
        Status = reply;
    }

    public void GetUserControlBReply(string reply)
    {
        //nothing to do
    }

    public void PingReply(string reply)
    {
        //nothing to do
    }
}

public class UserControlAViewModel : INotifyPropertyChanged
{
    private UserControlAModel _uControlAModel;
    public UserControlAModel MyUserControlAModel
    {
        get
        { return _uControlAModel; }
        set
        { _uControlAModel = value; NotifyPropertyChanged(); }
    }

    public string LblStatus
    {
        get { return MyUserControlAModel.Status; }
        set { MyUserControlAModel.Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAViewModel()
    {
        MyUserControlAModel = new UserControlAModel();
        MyUserControlAModel.PropertyChanged -= UserControlAModel_PropertyChanged;
        MyUserControlAModel.PropertyChanged += UserControlAModel_PropertyChanged;

        MyUserControlAModel.GetStatus();
    }

    private void UserControlAModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        NotifyPropertyChanged(string.Empty);
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

UserControlAViewModel.cs

[ServiceContract(CallbackContract = typeof(ISrvServiceCallback))]
public interface ISrvService
{
    [OperationContract(IsOneWay = true)]
    void Ping();

    [OperationContract(IsOneWay = true)]
    void GetUserControlAStatus();

    [OperationContract(IsOneWay = true)]
    void GetUserControlBStatus();
}

public interface ISrvServiceCallback
{
    [OperationContract(IsOneWay = true)]
    void PingReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);

    [OperationContract(IsOneWay = true)]
    void GetUserControlAReply(string reply);
}

    public void GetUserControlAReply(string reply)
    {
        //nothing to do
    }

public class UserControlAModel: INotifyPropertyChanged, SrvService.ISrvServiceCallback
{
    System.ServiceModel.InstanceContext instanceContext;
    SrvService.SrvServiceClient client;

    public event PropertyChangedEventHandler PropertyChanged;

    private string _Status;
    public string Status
    {
        get { return _Status; }
        set { _Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAModel()
    {
        Status = "NOT CONNECTED";
    }

    public void GetStatus()
    {
        instanceContext = new System.ServiceModel.InstanceContext(this);
        client = new SrvService.SrvServiceClient(instanceContext);
        client.GetUserControlAStatus();
    }

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    //callbacks implementation
    public void GetUserControlAReply(string reply)
    {
        Status = reply;
    }

    public void GetUserControlBReply(string reply)
    {
        //nothing to do
    }

    public void PingReply(string reply)
    {
        //nothing to do
    }
}

public class UserControlAViewModel : INotifyPropertyChanged
{
    private UserControlAModel _uControlAModel;
    public UserControlAModel MyUserControlAModel
    {
        get
        { return _uControlAModel; }
        set
        { _uControlAModel = value; NotifyPropertyChanged(); }
    }

    public string LblStatus
    {
        get { return MyUserControlAModel.Status; }
        set { MyUserControlAModel.Status = value; NotifyPropertyChanged(); }
    }

    public UserControlAViewModel()
    {
        MyUserControlAModel = new UserControlAModel();
        MyUserControlAModel.PropertyChanged -= UserControlAModel_PropertyChanged;
        MyUserControlAModel.PropertyChanged += UserControlAModel_PropertyChanged;

        MyUserControlAModel.GetStatus();
    }

    private void UserControlAModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        NotifyPropertyChanged(string.Empty);
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

---

创建一个单独的类来实现您的

ISrvService

下一步，使这个类成为一个单独的类。 现在，您可以在任何地方访问wcf函数，并且只有一个实现

编辑：这是一个基于我以前代码的解决方案

实施

public class SrvServiceCallbackProxy : ISrvServiceCallback
  {

    public event EventHandler PingReplyReceived;

    private SrvServiceClient _innerClient;

    private SrvServiceCallbackProxy() {
      var instanceContext = new System.ServiceModel.InstanceContext(this);
      _innerClient = new SrvService.SrvServiceClient(instanceContext);

    }

    private static SrvServiceCallbackProxy _instance;
    public static SrvServiceCallbackProxy Instance => _instance ?? (_instance = new SrvServiceCallbackProxy());


    public void PingReply(string reply) {
      this.PingReplyReceived?.Invoke(reply, EventArgs.Empty);
    }
}

用法

SrvServiceCallbackProxy.Instance.PingReplyReceived += ..Here goes the method..

注意

我一直在这样做。我将回调实现包装在带有事件的单例代理隧道服务器响应中

好处： 你有一个！类，该类始终可用。 你只需要实现你的逻辑一次！

---

每个消费者都会收到您可以按需订阅的事件通知。

我的错误：我是指客户端的ISrvServiceCallback接口这里的答案相同；）这个解决方案适用于这两个方面，我认为我遗漏了一些东西：UserControlA是由绑定到UserControlAViewModel的UserControlAView.xaml形成的，其中包括UserControlAModel。现在，模型调用服务并实现回调以更新内部属性（向viewModel bla bla发送通知）。如何从包含回调代码的实现中修改UserControlAModel的属性？@aDone您可以编辑您的问题并粘贴代码，以便我可以更深入地查看吗？很好的建议！问题编辑！我将试用您上次编辑的代码，看看会发生什么！：）我会让你知道的！