java - 将java转换为c#的问题

Question

我正在尝试转换位于 How to use signalr in android Service 的代码从java到c#并且已经取得了一些进展。我现在陷入了最后的方法。 java代码为:

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，这会转换为:

    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);
        }
    }

这当然会在 Visual Studio 2017 中生成多个错误。

首先，行Platform.loadPlatformComponent(new AndroidPlatformComponent());生成错误 Platform is inaccessible due to its protection level 。 Platform在 Xamarin for Visual Studio 2017 中确实受到保护，并且是 System 中的内部类我无法改变这一点，所以我不知道如何继续下去。同一行生成错误 The type or namespace name 'AndroidPlatformComponent' could not be found ，这些错误数量众多，并不意外，我只是找不到相当于 AndroidPlatformComponent 的错误。在 Visual Studio 2017 中，所以我不知道如何解决这个问题。

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 ，我也无法找到与此等效的内容，并且我再次不知所措。同样在这条线上，.Logger没有为集线器连接定义，显然它是 .getLogger()在java中，我也无法找到与此相对应的东西。

下一行SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.Start(clientTransport);' generates the error 1The type or namespace name 'SignalRFuture<>' could not be found ，这似乎是 SignalR 特有的，同样，我无法找到等效的。

下一个让我完全难住了，那行private class SubscriptionHandler2AnonymousInnerClass : SubscriptionHandler2<string, LoginInfo>生成错误 The type or namespace name 'SubscriptionHandler2<,>' could not be found 。我在网上到处查找并阅读了 AnonymousInnerClass，但这对这没有帮助。

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

Answer 1

事实证明，我转换的 java 代码中的最后一个方法是连接一个事件，将从集线器接收到的消息传递给 Activity 。在 c#/Visual Studio (2017) 中，这样做的方式非常不同，这就是为什么我不理解/认识到发生了什么。因此，我在 C# 中创建了一个处理程序，并为该消息执行一条弹出消息。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内启动 SignalR 并启动处理程序 WireUp 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));
        });
    }

正如我预料的那样，当应用程序在后台运行时，不会出现弹出消息，因此我正在研究解决方法