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我在WinRT中創建了自定義事件的類。WinRT:自己的事件處理程序,令牌不會被刪除
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading.Tasks;
namespace BA_Lib
{
public class RTEventHandler<T>
{
private EventRegistrationTokenTable<EventHandler<T>> m_EventTokenTable = null;
public event EventHandler<T> Event
{
add { EventRegistrationTokenTable<EventHandler<T>>.GetOrCreateEventRegistrationTokenTable(ref m_EventTokenTable).AddEventHandler(value); return; }
remove { EventRegistrationTokenTable<EventHandler<T>>.GetOrCreateEventRegistrationTokenTable(ref m_EventTokenTable).RemoveEventHandler(value); }
}
public void Fire(T argument)
{
EventHandler<T> temp = EventRegistrationTokenTable<EventHandler<T>>.GetOrCreateEventRegistrationTokenTable(ref m_EventTokenTable).InvocationList;
if (temp != null)
temp(null, argument);
}
public void Fire(object sender,T argument)
{
EventHandler<T> temp = EventRegistrationTokenTable<EventHandler<T>>.GetOrCreateEventRegistrationTokenTable(ref m_EventTokenTable).InvocationList;
if (temp != null)
temp(sender, argument);
}
}
}
我使用這個類來創建自定義綁定到自己的事件,就像這樣:
public RTEventHandler<int> Count{get;set;}
public void init(){Count=new RTEventHandler<int>();}
,然後從其他類:
EventHolder.Count.Event+=myEventHandler;
這個工程就像一個魅力,但是當我試着從EventHolder.Count.Event-=myEventHandler;
事件中取消註冊,令牌留下的是表格。這會導致不需要的行爲,因爲事件處理程序會累積並多次觸發。