如何将 Java 语法转换为 C# of Myclass obj=new Myclass() public override mymethod()

Posted 2023-04-13

【中文标题】如何将 Java 语法转换为 C# of Myclass obj=new Myclass() public override mymethod()

【英文标题】：How to convert Java Syntax to C# of Myclass obj=new Myclass() public override mymethod() 如何将 Java 语法转换为 C# of Myclass obj=new Myclass() public override mymethod()

【发布时间】：2020-04-04 18:03:21

【问题描述】：

我想将 Java 代码转换为 C#，但这样做会遇到问题

public class MyService extends Service 

  static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
  NotificationManager manager ;

@Nullable
@Override
public IBinder onBind(Intent intent) 
    return null;


@Override
public int onStartCommand(Intent intent, int flags, int startId) 
    // Let it continue running until it is stopped.
    Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
    IntentFilter filter = new IntentFilter();
    filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
    BroadcastReceiver receiver = new BroadcastReceiver() 
        @Override
        public void onReceive(Context context, Intent intent) 
            String action = intent.getAction();
            if (CONNECTIVITY_CHANGE_ACTION.equals(action)) 
                //check internet connection
                if (!ConnectionHelper.isConnectedOrConnecting(context)) 
                    if (context != null) 
                        boolean show = false;
                        if (ConnectionHelper.lastNoConnectionTs == -1) //first time
                            show = true;
                            ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
                         else 
                            if (System.currentTimeMillis() - ConnectionHelper.lastNoConnectionTs > 1000) 
                                show = true;
                                ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
                            
                        

                        if (show && ConnectionHelper.isOnline) 
                            ConnectionHelper.isOnline = false;
                            Log.i("NETWORK123","Connection lost");
                            //manager.cancelAll();
                        
                    
                 else 
                    Log.i("NETWORK123","Connected");
                    showNotifications("APP" , "It is working");
                    // Perform your actions here
                    ConnectionHelper.isOnline = true;
                
            
        
    ;
    registerReceiver(receiver,filter);
    return START_STICKY;


@Override
public void onDestroy() 
    super.onDestroy();
    Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();

这部分在代码中间我没有得到

BroadcastReceiver receiver = new BroadcastReceiver() 
    @Override
    public void onReceive(Context context, Intent intent)
    

    
;

【参考方案1】：

您可能希望看到一个更全面的答案，以了解给定的建议如何组合在一起：

public class MyService : Service

  internal const string CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
  internal NotificationManager manager;

  public override IBinder onBind(Intent intent)
  
    return null;
  

  public override int onStartCommand(Intent intent, int flags, int startId)
  
    // Let it continue running until it is stopped.
    Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
    IntentFilter filter = new IntentFilter();
    filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
    BroadcastReceiver receiver = new BroadcastReceiverAnonymousInnerClass();
    registerReceiver(receiver,filter);
    return START_STICKY;
  

  private class BroadcastReceiverAnonymousInnerClass : BroadcastReceiver
  
      public override void onReceive(Context context, Intent intent)
      
          string action = intent.Action;
          if (CONNECTIVITY_CHANGE_ACTION.Equals(action))
          
              //check internet connection
              if (!ConnectionHelper.isConnectedOrConnecting(context))
              
                  if (context != null)
                  
                      bool show = false;
                      if (ConnectionHelper.lastNoConnectionTs == -1)
                       //first time
                          show = true;
                          ConnectionHelper.lastNoConnectionTs = DateTimeHelper.CurrentUnixTimeMillis();
                      
                      else
                      
                          if (DateTimeHelper.CurrentUnixTimeMillis() - ConnectionHelper.lastNoConnectionTs > 1000)
                          
                              show = true;
                              ConnectionHelper.lastNoConnectionTs = DateTimeHelper.CurrentUnixTimeMillis();
                          
                      

                      if (show && ConnectionHelper.isOnline)
                      
                          ConnectionHelper.isOnline = false;
                          Log.i("NETWORK123","Connection lost");
                          //manager.cancelAll();
                      
                  
              
              else
              
                  Log.i("NETWORK123","Connected");
                  showNotifications("APP", "It is working");
                  // Perform your actions here
                  ConnectionHelper.isOnline = true;
              
          
      
  

  public override void onDestroy()
  
    base.onDestroy();
    Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
  


internal static class DateTimeHelper

    private static readonly System.DateTime Jan1st1970 = new System.DateTime(1970, 1, 1, 0, 0, 0, System.DateTimeKind.Utc);
    public static long CurrentUnixTimeMillis()
    
        return (long)(System.DateTime.UtcNow - Jan1st1970).TotalMilliseconds;
    

【参考方案2】：

我认为你会做这样的事情

var receiver = new MyReceiver();

public class MyReceiver : BroadcastReceiver

    public override void onReceive(Context context, Intent intent)
    

    

【参考方案3】：

由于 C# 不允许匿名类，因此您必须显式创建它，然后从该类传递您需要的数据。

[BroadcastReceiver(Enabled = true, Exported = false)]
public class SampleReceiver : BroadcastReceiver

   public override void OnReceive(Context context, Intent intent)
   
    // Do stuff here.
   

然后像这样使用它：

var receiver = new SampleReceiver();

【讨论】：

外面会是一个新类，实际检查docs.microsoft.com/en-us/xamarin/android/app-fundamentals/…