Windows Phone 7 MVVM模式通讯方式之实现Attached Behavior
MVVM模式的View与ViewModel的三大通讯方式：Binding Data（实现数据的传递）、Command（实现操作的调用）和Attached
Behavior（实现控件加载过程中的操作）。
Behavior（实现控件加载过程中的操作）。
(1)Windows Phone 7 MVVM模式通讯方式之实现Binding Data。
(2)Windows Phone 7 MVVM模式通讯方式之实现Command。
(3)Windows Phone 7 MVVM模式通讯方式之实现Attached Behavior。
下面通过一个实例实现MVVM模式的Attached Behavior通讯，Attached Behavior与Command的区别就是，Attached Behavior在控件的加载过程中完成它的任务。
下面看一下实例的运行效果：
（1）MainPage.xaml页面代码，View层
<
phone:PhoneApplicationPage
x:Class
="AttachedBehaviorDemo.MainPage"
xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone
="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell
="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d
="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc
="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local
="clr-namespace:AttachedBehaviorDemo"
mc:Ignorable
="d"
d:DesignWidth
="480"
d:DesignHeight
="768"
FontFamily
="
{StaticResource PhoneFontFamilyNormal}
"
FontSize
="
{StaticResource PhoneFontSizeNormal}
"
Foreground
="
{StaticResource PhoneForegroundBrush}
"
SupportedOrientations
="Portrait"
Orientation
="Portrait"
shell:SystemTray.IsVisible
="True"
>
<
Grid
x:Name
="LayoutRoot"
Background
="Transparent"
>
<
Grid.RowDefinitions
>
<
RowDefinition
Height
="Auto"
/>
<
RowDefinition
Height
="*"
/>
</
Grid.RowDefinitions
>
<
StackPanel
x:Name
="TitlePanel"
Grid.Row
="0"
Margin
="12,17,0,28"
>
<
TextBlock
x:Name
="ApplicationTitle"
Text
="MY APPLICATION"
Style
="
{StaticResource PhoneTextNormalStyle}
"
/>
<
TextBlock
x:Name
="PageTitle"
Text
="AttachedBehavior"
Margin
="9,-7,0,0"
Style
="
{StaticResource PhoneTextTitle1Style}
"
/>
</
StackPanel
>
<
Grid
x:Name
="ContentPanel"
Grid.Row
="1"
Margin
="12,0,12,0"
>
<
TextBlock
FontSize
="50"
Text
="金色 Gold"
local:Behavior.Brush
="Gold"
Margin
="0,6,0,504"
/>
<
TextBlock
FontSize
="50"
Text
="绿色 Green"
local:Behavior.Brush
="Green"
Margin
="0,94,0,416"
/>
<
TextBlock
FontSize
="50"
Text
="蓝色 Blue"
local:Behavior.Brush
="Blue"
Margin
="0,184,0,339"
/>
<
TextBlock
FontSize
="50"
Text
="橙色 Orange"
local:Behavior.Brush
="Orange"
Margin
="-3,274,3,243"
/>
<
TextBlock
FontSize
="50"
Text
="紫色 Purple"
local:Behavior.Brush
="Purple"
Margin
="0,386,0,133"
/>
<
TextBlock
FontSize
="50"
Text
="橄榄色 Olive"
local:Behavior.Brush
="Olive"
Margin
="0,497,0,0"
Height
="110"
VerticalAlignment
="Top"
/>
</
Grid
>
</
Grid
>
</
phone:PhoneApplicationPage
>
（2）
Behavior.cs
类代码，处理附加的属性和事件。
using
System.Windows;
using
System.Windows.Controls;
using
System.Windows.Input;
using
System.Windows.Media;
namespace
AttachedBehaviorDemo
{
static
public
class
Behavior
{
//
注册一个附加属性BrushProperty，在XAML中名字为Brush，是Brush类型，在Hover类中，PropertyMetadata初始化元数据
public
static
readonly
DependencyProperty BrushProperty
=
DependencyProperty.RegisterAttached(
"
Brush
"
,
typeof
(Brush),
typeof
(Behavior),
new
PropertyMetadata (
null
,
new
PropertyChangedCallback(OnHoverBrushChanged)));
///
<summary>
///
获取Brush的属性值
///
</summary>
///
<param name="obj"></param>
///
<returns></returns>
public
static
Brush GetBrush(DependencyObject obj)
{
return
(Brush)obj.GetValue(BrushProperty);
}
///
<summary>
///
设置属性的值
///
</summary>
///
<param name="obj"></param>
///
<param name="value"></param>
public
static
void
SetBrush(DependencyObject obj, Brush value)
{
obj.SetValue(BrushProperty, value);
}
///
<summary>
///
属性初始化
///
</summary>
///
<param name="obj"></param>
///
<param name="args"></param>
private
static
void
OnHoverBrushChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
//
获取属性所在的TextBlock控件
TextBlock control
=
obj
as
TextBlock;
//
注册控件的事件
if
(control
!=
null
)
{
//
注册鼠标进入事件
control.MouseEnter
+=
new
MouseEventHandler(OnControlEnter);
//
注册鼠标离开事件
control.MouseLeave
+=
new
MouseEventHandler(OnControlLeave);
}
}
///
<summary>
///
鼠标进入事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
static
void
OnControlEnter(
object
sender, MouseEventArgs e)
{
//
获取当前的TextBlock控件
TextBlock control
=
(TextBlock)e.OriginalSource;
//
设置控件的前景颜色为红色
control.Foreground
=
new
SolidColorBrush(Colors.Red);
}
///
<summary>
///
鼠标离开事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
static
void
OnControlLeave(
object
sender, MouseEventArgs e)
{
//
获取当前的TextBlock控件
TextBlock control
=
(TextBlock)e.OriginalSource;
//
设置控件的前景颜色为当前控件的Brush属性的值
control.Foreground
=
GetBrush(control);
}
}
}