Question

我的MS SQL数据库上有一个表。（2008 R2）表名：MESSAGES fields：message_id，message，is_synced

在我的移动智能手机上，我需要开发能够同步我的桌面记录的应用程序并在应用程序同步每条记录时更新表。我需要支持对WCF的MIN号码，所以我不能为每条记录生成呼叫。

如果表中有n条记录，我不会再拨打WCF，我想打电话一次，获取所有记录，同步并使用WCF返回所有同步结果。这是正确的方法吗？你能建议更好的实施吗？

Answer 1

当事情发生变化时，您可以进行双工通信以将数据发送到服务中的所有智能手机。

http://www.codeproject.com/Articles/491844/A-Beginners-Guide-to-Duplex-WCF

http://msdn.microsoft.com/en-us/library/ms731064.aspx

但是，根据您当前的实施情况回答当前的问题，您可以轮询服务 a开始时或计时器上所有消息的列表

在您的服务器上，您可以在一个简单的集合中使用这样的内容：

[ServiceContract(Namespace = "Contracts.IDatabaseResponder")]
public interface IDatabaseResponder
{
    //You could use an object rather than a string but then you have to mark the object
    [OperationContract]
    List<String> GetMessages();
    [OperationContract]
    void SyncMessagesBack(List<String> messages);

}



[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Multiple)]
public class DatabaseResponder : IDatabaseResponder
{
    List<String> _DatabaseMessageList;

    public List<String> GetMessages()
    {
        //Code here to go to SQL and grab all of the needed Messages
        //..


        return _DatabaseMessageList;
    }

    public void SyncMessagesBack(List<String> messages)
    {
        //Code here to go to SQL and update messages you want to update
        //..


    }

}

然后在客户端这样的事情会起作用：

    //Can use plain old list or ObservableCollection
    private IList<String> _DatabaseMessagesItems = new ObservableCollection<String>();
    private DatabaseResponderClient _Proxy;
    DispatcherTimer dispatcherTimer;
    List<String> LocalListOfMessages;

    public Constructor()
    {

          _Proxy = new DatabaseResponderClient();
          _Proxy.InnerChannel.Faulted += new EventHandler(InnerChannel_Faulted);


       try
       {
                _DatabaseMessagesItems = _Proxy.GetMessages();
       }
       catch (Exception ex)
       {
                MessageBox.Show(ex.Message);

                throw;
       }

       dispatcherTimer = new DispatcherTimer();
       dispatcherTimer.Tick += new EventHandler(dispatcherTimerTick);
       dispatcherTimer.Interval = new TimeSpan(0, 0, 60);
       dispatcherTimer.Start();

       dispatcherTimerTick();
    }


    private void dispatcherTimerTick(object sender, EventArgs e)
    {

        try
        {
             //Push back to the service any new or changed list of messages you need to push
             _Proxy.SyncMessagesBack(LocalListOfMessages);
        }
        catch (Exception ex)
        {
            //Handel error
        }
    }

   //Code to keep track of new messages add them etc
   //...

通过WCF服务同步SQL表

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