C# 属性修改 触发某事件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Dynamic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Windows.Forms;

namespace 属性监视
{
public partial class Form1 : Form
{
class EntityNotifier<T> : DynamicObject where T : new()
{
public class ObjectChangedEventArgs : EventArgs
{
public string PropertyName { get; set; }
public object OldValue { get; private set; }
public ObjectChangedEventArgs(string name, object value)
{
PropertyName = name;
OldValue = value;
}
}

private T innerObject { get; set; }

public EntityNotifier()
{
innerObject = new T();
}

public EntityNotifier(T obj)
{
innerObject = obj;
}

public static implicit operator EntityNotifier<T>(T obj)
{
return new EntityNotifier<T>(obj);
}

public static implicit operator T(EntityNotifier<T> obj)
{
return obj.innerObject;
}

public override bool TryGetMember(GetMemberBinder binder, out object result)
{
var p = typeof(T).GetProperties().SingleOrDefault(x => x.Name == binder.Name);
if (p == default(PropertyInfo))
{
result = null;
return false;
}
else
{
result = p.GetValue(innerObject, new object[] { });
return true;
}
}

public override bool TrySetMember(SetMemberBinder binder, object value)
{
var p = typeof(T).GetProperties().SingleOrDefault(x => x.Name == binder.Name);
if (p == default(PropertyInfo))
{
return false;
}
else
{
object oldvalue = p.GetValue(innerObject, new object[] { });
p.SetValue(innerObject, value, new object[] { });
if (ObjectChanged != null) ObjectChanged(this, new ObjectChangedEventArgs(binder.Name, oldvalue));
return true;
}
}

public event EventHandler<EntityNotifier<T>.ObjectChangedEventArgs> ObjectChanged;
}

class Person
{
public int ID { get; set; }
public string Name { get; set; }
}

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
dynamic person = new EntityNotifier<Person>();
person.ObjectChanged += new EventHandler<EntityNotifier<Person>.ObjectChangedEventArgs>((x, y) =>
{
Console.WriteLine("obj.{0} changed.", y.PropertyName);
});
person.Name = "张三";

Person p = person;
Console.WriteLine(p.ID.ToString());
}
}
}