inotifypropertychanged實現
inotifypropertychanged會向客戶端發出某一屬性值已更改的通知。當元素屬性值改變時，會通知後台model
前台**不變，我們讓後台students model實現inotifypropertychanged介面。
通過datacontext實現資料資料項的變更通知。新增乙個viewmodel類，實現inotifypropertychanged介面
前台xmal
x:class
= xmlns
=""xmlns:x
=""xmlns:d
=""xmlns:mc
=""mc:ignorable
="d"
title
="mainwindow"
height
="450"
width
="800"
>
>
height
="295"
width
="427"
horizontalalignment
="left"
verticalalignment
="top"
margin
="10,10,0,0"
name
="stackpane1"
>
height
="23"
name
="txtblock1"
text
="學員編號"
>
textblock
>
height
="23"
name
="txtstudentid"
width
="301"
horizontalalignment
="left"
>
textbox
>
height
="23"
name
="txtblock2"
text
="學員列表"
>
textblock
>
height
="156"
name
="lbstudent"
width
="305"
horizontalalignment
="left"
itemssource=""
>
>
>
name
="stackpanel2"
orientation
="horizontal"
>
text=""
margin
="5"
background
="beige"
>
textblock
>
text=""
margin
="5"
>
textblock
>
text=""
margin
="5"
>
textblock
>
stackpanel
>
datatemplate
>
listbox.itemtemplate
>
listbox
>
content
="button"
height
="23"
name
="button1"
width
="75"
horizontalalignment
="left"
click
="button1_click"
>
button
>
stackpanel
>
grid
>
window
>
using system.collections.objectmodel;
using system.componentmodel;
using system.windows;
using system.windows.controls;
using system.windows.data;
///
/// - 欄位或屬性實現inotifypropertychanged介面，實現了該介面，只要欄位或屬性的發生了改變，就會提供通知機制
/// - wpf 提供 observablecollection類，它是實現 inotifycollectionchanged 介面的資料集合的內建實現，以便集合中的插入或刪除操作可以自動更新 ui
///
,new
students()
,new
students()
,new
students()
};this
.lbstudent.datacontext = viewmodel;
this
.txtstudentid.
setbinding
(textbox.textproperty,
newbinding
("selecteditem.id"))
;}private
void
button1_click
(object sender,
routedeventargs e)
;
viewmodel.studentlist =
newobservablecollection
<
students
>()
,new
students()
,new
students()
,new
students()
};viewmodel.studentlist[2]
.name =
"這是乙個屬性改變";}
public
class
students
:inotifypropertychanged
string _name;
public
string name
set}
public
int age
protected
virtual
void
onpropertychanged
(string propertyname)
}public
event
propertychangedeventhandler propertychanged;
}public
class
viewmodel
:inotifypropertychanged
set}
}public
event
propertychangedeventhandler propertychanged;
private
void
onpropertychanged
(string propertyname)}}
}}
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