c#仿ios通知（NSNotification）的实现

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace Notificationcenter
{
public enum Event
{
Event_load,
Event_add,
Event_remove
}
interface Notification
{
ArrayList objlist { get; set; }
void removeobjformlist(myclass obj, string strmethod, Event e);
void addobjtolist(myclass obj,string strmethod, Event e);
void update(Event e);
}
public class callbackserver : Notification
{
public callbackserver() {
objlist = new ArrayList();
}
public ArrayList objlist{get;set; }
public void addobjtolist(myclass obj, string strmethod, Event e)
{
string objname = obj.GetType().FullName;
Console.WriteLine(""+objname);
Dictionary<string,object> map = new Dictionary<string,object>();
map.Add("obj",objname);
map.Add("method", strmethod);
map.Add("evt", e);
objlist.Add(map);
}
public void removeobjformlist(myclass obj, string strmethod, Event e)
{
for (int i = 0; i < objlist.Count; i++) {
Dictionary<string, object> map = (Dictionary<string, object>)objlist[i];
if (((string)map["obj"] == obj.GetType().FullName) && ((Event)map["evt"] == e) && ((string)map["method"] == strmethod)) {
objlist.Remove(obj);
Console.WriteLine("remove
ok");
break;
};
}
}
public void update(Event e)
{
foreach (object o in objlist)
{
Dictionary<string, object> map = (Dictionary < string, object>) o;
if ((Event)map["evt"] == e)
{
Object obj = getobjformobjname((string)map["obj"]);
MethodInfo method = getmethodformobj(obj, (string)map["method"]);
method.Invoke(obj, null);
}
}
}
public Object getobjformobjname(string strobj)
{
Console.WriteLine("" + strobj);
Type type = Type.GetType(strobj);
return System.Activator.CreateInstance(type);
}
public MethodInfo getmethodformobj(Object obj, string strmethod)
{
return obj.GetType().GetMethod(strmethod, new Type[] { });
}
}
}

 先是通知类，定义事件Evnet，定义arraylist存放被通知对象。再定义注册通知和移除通知方法（addobjtolist和removeobjformlist），update方法就是具体的通知了。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Notificationcenter
{
public abstract class myclass {
public abstract void on_Event_load();
public void on_Event_add() { }
public void on_Event_remove() { }
}
class submack : myclass
{
public override void on_Event_load()
{
Console.WriteLine("wo is loading");
}
}
}

另定义一个被通知的类。可自己定义。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Notificationcenter
{
class Program
{
static void Main(string[] args)
{
Notification notification = new callbackserver();
submack sub = new submack();
notification.addobjtolist(sub, "on_Event_load", Event.Event_load);
notification.update(Event.Event_load);
Console.ReadKey();
}
}
}

测试类。new 通知类对象，new 被通知对象，注册通知，然后是发生通知事件。 本例用到观察者模式，和反射。