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C#事件实现(文章与反射器)
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公共类EventsType
{
公共事件EventHandler>新事件;
public void SmthHappened(string data)
{
MyEventArgs<Object> eventArgs = new MyEventArgs<Object>(data);
OnNewEvent(eventArgs);
}
private void OnNewEvent(MyEventArgs<Object> eventArgs)
{
EventHandler<MyEventArgs<Object>> tempEvent = NewEvent;
if (tempEvent != null)
{
tempEvent(this, eventArgs);
}
}
}
我希望C#编译器会像这样翻译NewEvent:
private EventHandler<MyEventArgs<object>> _newEvent;
public event EventHandler<MyEventArgs<object>> NewEvent
{
[MethodImpl(MethodImplOptions.Synchronized)]
add
{
_newEvent = (EventHandler<MyEventArgs<object>>)Delegate.Combine(_newEvent, value);
}
[MethodImpl(MethodImplOptions.Synchronized)]
remove
{
_newEvent = (EventHandler<MyEventArgs<object>>)Delegate.Remove(_newEvent, value);
}
}
,但Reflector表示它是以这种方式实现的:
public event EventHandler<MyEventArgs<object>> NewEvent
{
add
{
EventHandler<MyEventArgs<object>> handler2;
EventHandler<MyEventArgs<object>> newEvent = this.NewEvent;
do
{
handler2 = newEvent;
EventHandler<MyEventArgs<object>> handler3 = (EventHandler<MyEventArgs<object>>) Delegate.Combine(handler2, value);
newEvent = Interlocked.CompareExchange<EventHandler<MyEventArgs<object>>>(ref this.NewEvent, handler3, handler2);
}
while (newEvent != handler2);
}
remove
{
EventHandler<MyEventArgs<object>> handler2;
EventHandler<MyEventArgs<object>> newEvent = this.NewEvent;
do
{
handler2 = newEvent;
EventHandler<MyEventArgs<object>> handler3 = (EventHandler<MyEventArgs<object>>) Delegate.Remove(handler2, value);
newEvent = Interlocked.CompareExchange<EventHandler<MyEventArgs<object>>>(ref this.NewEvent, handler3, handler2);
}
while (newEvent != handler2);
}
}
拜托,smb解释我为什么会这样?
解决方法:
是的:C# 4 has made some changes in this area,基本上.它使其无需锁定即可保证线程安全.这不是唯一的变化 – 它还会改变对类中类字段事件的引用的解决方式:=和 – =现在通过“添加”和“删除”位而不是直接使用支持字段.
请注意,此更改会影响使用C#4编译器编译的代码,甚至是旧框架;锁定也有变化,只影响针对.NET 4编译的代码,因为它使用了一种新方法(Monitor.TryEnter(object, out bool)).
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