将java转换为c#的问题

Question

我正在尝试将位于 How to use signalr in android Service 的代码从 java 转换为 c#，并且已经取得了一些进展。我现在坚持最后一种方法。 java代码是：

private void startSignalR() {
    Platform.loadPlatformComponent(new AndroidPlatformComponent());
    mInstance.setmHubConnection();
    mInstance.setHubProxy();
    ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.getLogger());
    SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.start(clientTransport);

    try {
        signalRFuture.get();
    } catch (InterruptedException | ExecutionException e) {
        Log.e("SimpleSignalR", e.toString());
        return;
    }

    mInstance.sendMessage(MainActivity.unm,"Hello All!");

    String CLIENT_METHOD_BROADAST_MESSAGE = "recievedMessage";
    mInstance.mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE,
            new SubscriptionHandler2<String,LoginInfo>() {
                @Override
                public void run(final String msg,final LoginInfo loginInfo) {
                    final String finalMsg = loginInfo.FullName  + "  says " + loginInfo.Password;
                Intent intent = new Intent();
                intent.setAction(MY_ACTION);
                intent.putExtra("DATAPASSED", finalMsg);
                sendBroadcast(intent);
            }
        }
        , String.class,LoginInfo.class);
}

使用 java 到 c# 转换器，转换为：

    private void startSignalR()
    {
        Platform.loadPlatformComponent(new AndroidPlatformComponent());
        mInstance.setmHubConnection();
        mInstance.setHubProxy();
        ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.Logger);
        SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.Start(clientTransport);

        try
        {
            signalRFuture.get();
        }
        catch (Exception e) when (e is InterruptedException || e is ExecutionException)
        {
            // Log.e("SimpleSignalR", e.ToString());
            return;
        }

        mInstance.sendMessage("", "Hello All!");

        string CLIENT_METHOD_BROADAST_MESSAGE = "recievedMessage";
        //String CLIENT_METHOD_BROADAST_MESSAGE = "messageReceived";
        mInstance.mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE, new SubscriptionHandler2AnonymousInnerClass(this)
           , typeof(string), typeof(LoginInfo));
    }

    private class SubscriptionHandler2AnonymousInnerClass : SubscriptionHandler2<string, LoginInfo>
    {
        private readonly SignalRSrv outerInstance;

        public SubscriptionHandler2AnonymousInnerClass(SignalRSrv outerInstance)
        {
            this.outerInstance = outerInstance;
        }

        //JAVA TO C# CONVERTER WARNING: 'final' parameters are not available in .NET:
        //ORIGINAL LINE: @Override public void run(final String msg,final LoginInfo loginInfo)
        public override void run(string msg, LoginInfo loginInfo)
        {
            //JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
            //ORIGINAL LINE: final String finalMsg = loginInfo.FullName + "  says " + loginInfo.Password;
            string finalMsg = loginInfo.FullName + "  says " + loginInfo.Password;
            Intent intent = new Intent();
            intent.Action = MY_ACTION;
            intent.PutExtra("DATAPASSED", finalMsg);
            sendBroadcast(intent);
        }
    }

当然，这在 Visual Studio 2017 中产生了几个错误。

首先，Platform.loadPlatformComponent(new AndroidPlatformComponent()); 行生成了错误Platform is inaccessible due to its protection level。 Xamarin for Visual Studio 2017 中的Platform 确实受到保护，并且是System 中的一个内部类，我无法更改它，所以我不知道如何继续它。同一行会生成错误The type or namespace name 'AndroidPlatformComponent' could not be found，这些错误很多而且并不意外我只是在 Visual Studio 2017 中找不到与AndroidPlatformComponent 等效的错误，所以我不知道如何解决这个错误。

接下来，在这一行ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.Logger); 生成错误The type or namespace name 'ClientTransport' could not be found，我也无法找到与此相同的等效项，我再次不知所措。同样在这一行上，.Logger 没有为集线器连接定义，显然它是 java 中的.getLogger()，我也找不到这个的等价物。

在SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.Start(clientTransport);' generates the error 1The type or namespace name 'SignalRFuture<>' could not be found 的下一行，这似乎是 SignalR 特有的，再次，我找不到等效项。

下一个让我完全被难住了，private class SubscriptionHandler2AnonymousInnerClass : SubscriptionHandler2<string, LoginInfo> 行生成了错误The type or namespace name 'SubscriptionHandler2<,>' could not be found。我在网上到处查看并阅读了 AnonymousInnerClass，但对此无济于事。

我希望这里的用户更熟悉 SignalR 以及 c# 功能和 java 功能之间的区别。我对java一点也不熟悉，对SignalR和前台服务也不熟悉。

Answer 1

事实证明，我正在转换的 java 代码中的最后一个方法是连接一个事件，以便将从集线器接收到的消息传递给活动。在 c#/Visual Studio (2017) 中，这是非常不同的，这就是为什么我不理解/认识到发生了什么。所以我在 C# 中创建了一个处理程序并为该消息执行一个弹出消息。这本身可能会带来问题，但至少我知道发生了什么。这是我编写的用于从服务中启动 SignalR 并 WireUp 处理程序的代码：

    private void startSignalR()
    {
        // Company, Department, and section are private variables
        // their values are pulled from the intent bundle 
        // in the OnBind method, that code is:
        //     Bundle bundlee = intent.GetBundleExtra("TheBundle");
        //     MyUser = bundlee.GetParcelable("MyUser") as User;
        // This information is put into the bundle when the user is logged in.
        // I then pass that information to the SignalR client 
        // when I set the hub connection and placed on the querystring to the hub.

        mInstance.setmHubConnection(username, firstname,lastname,company,department,section);
        mInstance.setHubProxy();

        try
        {
            // Connect the client to the hup
            mInstance.mHubConnection.Start();
            // Set the event handler
            mInstance.WireUp();

        }
        catch (System.Exception e) when (e is InterruptedException || e is ExecutionException)
        {
            ShowMessage("Error: + e.Message)
        }
    }

这是WireUp代码，这是客户端代码中的一个方法：

    public void WireUp()
    {
        // set the event handler
        mHubProxy.On("broadcastMessage", (string platform, string message) =>
        {
            if (OnMessageReceived != null)
                OnMessageReceived(this, string.Format("{0}: {1}", platform, message));
        });
    }

正如我所料，当应用程序在后台时，弹出消息不会出现，所以我正在研究一种解决方法