模板在EventHandler 和EventArgs的应用

1.声明事件参数

public class ItemEventArgs<T> : EventArgs
{
    public ItemEventArgs(T item)
    {
        Item = item;
    }
 
    public T Item { get; protected set; }
}

2.声明事件委托

public delegate void ItemEventHandler<T>(object sender, ItemEventArgs<T> e);

3.

public event ItemEventHandler<DataPacket> PacketReceived;

4.

protected virtual void OnPacketReceived(ItemEventArgs<DataPacket> e)
{
    if (PacketReceived != null) PacketReceived(this, e);
}

5.

OnPacketReceived(new ItemEventArgs<DataPacket>(_packet));

6

改进

public static implicit operator ItemEventArgs<T>(T item)
{
    return new ItemEventArgs<T>(item);
}

7.

OnPacketReceived(_packet);

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