已解决的事件订阅

时间:2013-05-14 11:01:01

标签: c# events

在我的几个项目中,我显然需要比标准.NET事件更强大的功能。

基本上,我想要在消息泵中选择,当他们感兴趣的组件发生变化时,将回调(事件)提升到特定订阅者。

这可能是一个项目的特定I / O更改状态(例如按钮关闭联系人),或者是从无线以太网接收的另一个特定MAC地址的消息。

我目前的想法是使用字典和每个地址的代表列表(对于此示例)。

我还没有调试过这个,但是右边是以下几行吗?

class CustomSubscription
{
    public delegate void DataReceivedHandler(object sender, DataReceivedEventArgs args);

    public class DataReceivedEventArgs : EventArgs
    {
        public byte[] data;
    }

    private readonly Dictionary<int, List<DataReceivedHandler>> _subscribers;

    public CustomSubscription()
    {
        _subscribers = new Dictionary<int, List<DataReceivedHandler>>();
    }

    public void AddSubscriber(int address, DataReceivedHandler callback)
    {
        if (false == _subscribers.ContainsKey(address))
        {
            _subscribers.Add(address, new List<DataReceivedHandler>());
        }
        _subscribers[address].Add(callback);
    }

    public void RemoveSubscriber(int address, DataReceivedHandler callback)
    {
        if (false == _subscribers.ContainsKey(address))
        {
            return;
        }
        if (_subscribers[address].Contains(callback))
        {
            _subscribers[address].Remove(callback);
        }
    }

    public void HandleIncommingData(int address, object sender, byte[] payload)
    {
        if (false == _subscribers.ContainsKey(address))
        {
            // Nothing subscribed - take no action
            return;
        }

        // Raise callbacks with all subscribers
        foreach (DataReceivedHandler callback in _subscribers[address])
        {
            callback(sender, new DataReceivedEventArgs
                                 {
                                     data = payload
                                 });
        }
    }
}

1 个答案:

答案 0 :(得分:0)

看起来您正在尝试实现事件聚合器模式。网上已经有很多实现。你可以从这里开始,例如: https://stackoverflow.com/questions/2343980/event-aggregator-implementation-sample-best-practices