Windows Phone 7 MVVM模式通讯方式之实现Binding Data

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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）。

(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Binding Data通讯



1、创建Model层

Food.cs




namespace BindingDataDemo.Model
{
public class Food
{
public string Name
{
get;
set;
}
public string Description
{
get;
set;
}
public string IconUri
{
get;
set;
}
public string Type
{
get;
set;
}
}
}


2.创建ViewModel层

FoodViewModel.cs




using System;
using System.ComponentModel;
using BindingDataDemo.Model;
using System.Collections.ObjectModel;
namespace BindingDataDemo.ViewModel
{
public class FoodViewModel : INotifyPropertyChanged
{
private  ObservableCollection _allFood;
public ObservableCollection AllFood
{
get
{
if (_allFood == null)
_allFood = new ObservableCollection();
return _allFood;
}
set
{
if (_allFood != value)
{
_allFood = value;
NotifyPropertyChanged("AllFood");
}
}
}
public FoodViewModel()
{
try   
{
Food item0 = new Food() { Name = "西红柿", IconUri = "Images/Tomato.png", Type = "Healthy" ,Description="西红柿的味道不错。" };
Food item1 = new Food() { Name = "茄子", IconUri = "Images/Beer.png", Type = "NotDetermined", Description = "不知道这个是否好吃。" };
Food item2 = new Food() { Name = "火腿", IconUri = "Images/fries.png", Type = "Unhealthy", Description = "这是不健康的食品。" };
Food item3 = new Food() { Name = "三明治", IconUri = "Images/Hamburger.png", Type = "Unhealthy" ,Description="肯德基的好吃？" };
Food item4 = new Food() { Name = "冰激凌", IconUri = "Images/icecream.png", Type = "Healthy", Description = "给小朋友吃的。" };
Food item5 = new Food() { Name = "Pizza", IconUri = "Images/Pizza.png", Type = "Unhealthy" ,Description="这个非常不错。" };
Food item6 = new Food() { Name = "辣椒", IconUri = "Images/Pepper.png", Type = "Healthy", Description = "我不喜欢吃这东西。" };
AllFood.Add(item0);
AllFood.Add(item1);
AllFood.Add(item2);
AllFood.Add(item3);
AllFood.Add(item4);
AllFood.Add(item5);
AllFood.Add(item6);
}      
catch ( Exception e )  
{         
System.Windows.MessageBox.Show( "Exception: " + e.Message );      
}   
}
// 定义PropertyChanged 事件
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}  

}
}


3、创建View层

MainPage.xaml








































OK!!!!!!!!!!!!!!!!!!!!!!!

备注:实现绑定数据的方法有很多种，原理都大同小异。