Silverlight dependency attributes

1. An object class needs to implement the "inotifypropertychanged" interface

 

Code

Public   Class Student: inotifypropertychanged
{
String Name;

Public string name
{< br> Get { return name ;}
set
{< br> name = value;

// here we need to pass "name ", instead of private variable "name"
policypropertychange ( " name " );
}< BR >}

Public IntAge {Get;Set;}

# RegionInotifypropertychanged Member

Public   Event Propertychangedeventhandler propertychanged; // Inotifypropertychanged interface delegate
Private   Void Notifypropertychange ( String Propertyname)
{
If (Propertychanged ! =   Null )
{
// Notification update: all controls bound with propertyname and property update interface values
Propertychanged ( This , New Propertychangedeventargs (propertyname ));
}
}

# Endregion
}

 

 

2. in XAML, set the update direction of the control binding: <SDK: Label Height = "28" content = "{binding name, mode = twoway }"

 

Code

< Grid X: Name = " Layoutroot " >
< Textbox height = " 23 " Horizontalalignment = " Left " Margin = " 250,144, 0, 0 " Name = " Txtname " Verticalalignment = " Top " Width = " 120 "   />
< SDK: Label height = " 23 " Content = " Name: " Horizontalalignment = " Left " Margin = " 175,144, 0, 0 " Name = " Label1 " Verticalalignment = " Top " Width = " 69 "   />
< Button content = " OK " Height = " 23 " Horizontalalignment = " Left " Margin = " 250,215, 0, 0 " Name = " Btnok " Verticalalignment = " Top " Width = " 75 " Click = " Btnok_click "   />
< SDK: Label height = " 28 " Content = " {Binding name, mode = twoway} " Horizontalalignment = " Left " Margin = " 175,103, 0, 0 " Name = " Labmessage " Verticalalignment = " Top " Width = " 120 "   />
< Textbox height = " 23 " Horizontalalignment = " Left " Margin = " 250,173, 0, 0 " Name = " Txtage " Verticalalignment = " Top " Width = " 120 "   />
< SDK: label content = " Age: " Height = " 23 " Horizontalalignment = " Left " Margin = " 175,173, 0, 0 " Name = " Label3 " Verticalalignment = " Top " Width = " 69 "   />
</ Grid >

 

 

3. In CSCodeUpdate object class dependency attributes

 

Code

Public   Partial   Class Page1: Page
{
Student mystudent =   New Student ();

PublicPage1 ()
{
Initializecomponent ();

Mystudent. Name= "Zhang San";
Mystudent. Age= 20;

This . datacontext = mystudent;
}

Private VoidBtnok_click (ObjectSender, routedeventargs E)
{
//When mystudent. Name is updated, the value of labmessage. Content is automatically updated.
Mystudent. Name=Txtname. text;
}
}