MVVM模式的View與ViewModel的三大通訊方式：Binding Data（實現數據的傳遞）、Command（實現操作的調用）和Attached Behavior（實現控件加載過程中的操作）。 (1)Windows Phone 7 MVVM模式通訊方式之實現Binding Data。 (2)Windows Phone 7 MVVM模式通訊方式之實現Command。 (3)Windows Phone 7 MVVM模式通訊方式之實現Attached Behavior。 下面通過一個實例實現MVVM模式的Command通訊 （1）MainPage.xaml文件的代碼,實現View層 <phone:PhoneApplicationPage x:Class="CommandDemo.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:my="clr-namespace:CommandDemo.ViewModel" xmlns:my_Interactivity="clr-namespace:CommandDemo.Command" xmlns:Custom="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" xmlns:ic="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions" 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"><!--設置整個頁面的上下文數據DataContext為RadiusViewModel--><phone:PhoneApplicationPage.DataContext><my:RadiusViewModel/></phone:PhoneApplicationPage.DataContext><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="Command" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/></StackPanel><Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"><Ellipse Fill="Red" Height="{Binding Radius}" Width="{Binding Radius}" HorizontalAlignment="Left" Margin="119,84,0,0" Name="ellipse1" Stroke="Black" StrokeThickness="1" VerticalAlignment="Top" /><Button Content="小" Height="72" HorizontalAlignment="Left" Margin="0,385,0,0" Name="button1" VerticalAlignment="Top" Width="160"><Custom:Interaction.Triggers><Custom:EventTrigger EventName="Click"><my_Interactivity:ExecuteCommandAction CommandName="MinRadius"/></Custom:EventTrigger></Custom:Interaction.Triggers></Button><Button Content="中" Height="72" HorizontalAlignment="Left" Margin="149,384,0,0" Name="button2" VerticalAlignment="Top" Width="160" ><Custom:Interaction.Triggers><Custom:EventTrigger EventName="Click"><my_Interactivity:ExecuteCommandAction CommandName="MedRadius"/></Custom:EventTrigger></Custom:Interaction.Triggers></Button><Button Content="大" Height="72" HorizontalAlignment="Left" Margin="299,382,0,0" Name="button3" VerticalAlignment="Top" Width="160" ><Custom:Interaction.Triggers><Custom:EventTrigger EventName="Click"><my_Interactivity:ExecuteCommandAction CommandName="MaxRadius"/></Custom:EventTrigger></Custom:Interaction.Triggers></Button></Grid></Grid></phone:PhoneApplicationPage> （2）RadiusViewModel.cs文件的代碼,實現ViewModel層 using System; using System.Windows.Input; using System.ComponentModel; using Microsoft.Expression.Interactivity.Core;namespace CommandDemo.ViewModel {public class RadiusViewModel : INotifyPropertyChanged{private Double radius;public RadiusViewModel(){Radius = 0;MinRadius = new ActionCommand(p => Radius = 100);MedRadius = new ActionCommand(p => Radius = 200);MaxRadius = new ActionCommand(p => Radius = 300);}public event PropertyChangedEventHandler PropertyChanged;public ICommand MinRadius{get; private set;}public ICommand MedRadius{get;private set;}public ICommand MaxRadius{get;private set;}public Double Radius{get{return radius;}set{radius = value;OnPropertyChanged("Radius");}}protected virtual void OnPropertyChanged(string propertyName){var propertyChanged = PropertyChanged;if(propertyChanged != null)propertyChanged(this, new PropertyChangedEventArgs(propertyName));}} } （3）ExecuteCommandAction.cs類，實現Command操作 using System; using System.Windows; using System.Windows.Input; using System.Windows.Interactivity; using System.Reflection;namespace CommandDemo.Command {public class ExecuteCommandAction : TriggerAction<FrameworkElement>{public static readonly DependencyProperty CommandNameProperty =DependencyProperty.Register("CommandName", typeof(string), typeof(ExecuteCommandAction), null);public static readonly DependencyProperty CommandParameterProperty =DependencyProperty.Register("CommandParameter", typeof(object), typeof(ExecuteCommandAction), null);protected override void Invoke(object parameter){if (AssociatedObject == null)return;ICommand command = null;var dataContext = AssociatedObject.DataContext;foreach (var info in dataContext.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance)){if (IsCommandProperty(info) && String.Equals(info.Name, CommandName, StringComparison.Ordinal)){command = (ICommand)info.GetValue(dataContext, null);break;}}if ((command != null) && command.CanExecute(CommandParameter)){command.Execute(CommandParameter);}}private static bool IsCommandProperty(PropertyInfo property){return typeof(ICommand).IsAssignableFrom(property.PropertyType);}public string CommandName{get{return (string)GetValue(CommandNameProperty);}set{SetValue(CommandNameProperty, value);}}public object CommandParameter{get{return GetValue(CommandParameterProperty);}set{SetValue(CommandParameterProperty, value);}}} }

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