Windows Phone 7 MVVM模式数据绑定和传递参数

数据绑定使用了ObservableCollection<T> 类来实现，ViewModel通过继承GalaSoft.MvvmLight.ViewModelBase类来实现，Command

使用GalaSoft.MvvmLight.Command.RelayCommand<T>来实现。

ObservableCollection<T>表示一个动态数据集合，在添加项、移除项或刷新整个列表时，此集合将提供通知。

客户列表绑定客户的名字、QQ、地址信息，单击的时候显示客户的全部详细信息。

View层

<phone:PhoneApplicationPage
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:Custom="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" xmlns:GalaSoft_MvvmLight_Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP7"
x:Class="MvvmLight5.MainPage"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait"
Orientation="Portrait"
mc:Ignorable="d"
d:DesignWidth="480"
d:DesignHeight="768"
shell:SystemTray.IsVisible="True"
DataContext="{Binding Main, Source={StaticResource Locator}}">
<Grid
x:Name="LayoutRoot"
Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="24,24,0,12">
<TextBlock
x:Name="ApplicationTitle"
Text="{Binding ApplicationTitle}"
Style="{StaticResource PhoneTextNormalStyle}" />
<TextBlock
x:Name="PageTitle"
Text="{Binding PageName}"
Margin="-3,-8,0,0"
Style="{StaticResource PhoneTextTitle1Style}" />
</StackPanel>
<Grid x:Name="ContentGrid" Grid.Row="1">
<ListBox x:Name="PersonListBox" Margin="10" ItemsSource="{Binding Customers}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<StackPanel
x:Name="DataTemplateStackPanel"
Orientation="Horizontal">
<TextBlock
x:Name="Name"
Text="{Binding Name}"
Margin="0,0,5,0"
Style="{StaticResource PhoneTextExtraLargeStyle}" />
<TextBlock
x:Name="QQ"
Text="{Binding QQ}"
Margin="0"
Style="{StaticResource PhoneTextExtraLargeStyle}" />
</StackPanel>
<TextBlock
x:Name="Email"
Text="{Binding Address}"
Margin="0"
Style="{StaticResource PhoneTextSubtleStyle}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<Custom:Interaction.Triggers>
<Custom:EventTrigger EventName="SelectionChanged">
<GalaSoft_MvvmLight_Command:EventToCommand x:Name="SelectionCommand" Command="{Binding DetailsPageCommand, Mode=OneWay}" CommandParameter="{Binding SelectedItem, ElementName=PersonListBox}"/>
</Custom:EventTrigger>
</Custom:Interaction.Triggers>
</ListBox>
</Grid>
</Grid>
</phone:PhoneApplicationPage>

ViewModel层

ViewModelLocator是对ViewModel进行初始化和清理的集中处理的类添加资源的时候只需要添加这一个类就可以了。

ViewModelLocator.cs

namespace MvvmLight5.ViewModel
{
public class ViewModelLocator
{
private static MainViewModel _main;
/// <summary>
/// 初始化在这里创建ViewModel 可以将多个ViewModel在这里一起创建
/// </summary>
public ViewModelLocator()
{
CreateMain();
}
/// <summary>
/// 获取MainViewModel的静态的实例对象
/// </summary>
public static MainViewModel MainStatic
{
get
{
if (_main == null)
{
CreateMain();
}
return _main;
}
}
/// <summary>
/// 获取MainViewModel的实例对象
/// </summary>
public MainViewModel Main
{
get
{
return MainStatic;
}
}
/// <summary>
///清理MainViewModel 退出程序的时候进行清理在App.xmal.cs中调用
/// </summary>
public static void ClearMain()
{
_main.Cleanup();
_main = null;
}
/// <summary>
/// 创建MainViewModel
/// </summary>
public static void CreateMain()
{
if ( _main == null )
{
_main = new MainViewModel();
}
}
}
}

MainViewModel.cs

using System.Collections.ObjectModel;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using MvvmLight5.Model;
namespace MvvmLight5.ViewModel
{
public class MainViewModel : ViewModelBase
{
/// <summary>
/// 数据绑定的客户列表
/// </summary>
public ObservableCollection<Customer> Customers
{
get
{
var customerCollection = new CustomerCollection();
return customerCollection.Customers;
}
}
//定义Command
public RelayCommand<Customer> DetailsPageCommand
{
get;
private set;
}
public string ApplicationTitle
{
get
{
return "MVVM LIGHT";
}
}
public string PageName
{
get
{
return "客户列表如下:";
}
}
public string Welcome
{
get
{
return "Welcome to MVVM Light";
}
}
/// <summary>
/// 初始化 MainViewModel
/// </summary>
public MainViewModel()
{
//初始化Command
DetailsPageCommand = new RelayCommand<Customer>( ( msg ) => GoToDetailsPage( msg ) );
}
private object GoToDetailsPage( Customer msg )
{
System.Windows.MessageBox.Show("客户的详细资料如下名字:" + msg.Name + " 城市:" + msg.City + " 地址:" + msg.Address + " 电话:" + msg.Phone + " QQ:" + msg.QQ);
return null;
}
}
}

Model层

Customers.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
namespace MvvmLight5.Model
{
public class CustomerCollection
{
//在这里绑定数据使用了ObservableCollection<T> 类
private readonly ObservableCollection<Customer> _customers = new ObservableCollection<Customer>();
public ObservableCollection<Customer> Customers
{
get { return _customers; }
}
public Customer GetCustomerByID( int id )
{
return _customers[ id ];
}
public CustomerCollection()
{
try
{
GenerateCustomers();
}
catch ( Exception e )
{
System.Windows.MessageBox.Show( "Exception: " + e.Message );
}
}
//初始化数据
public void GenerateCustomers()
{
_customers.Add( new Customer(1,"黄小琥","台湾高雄市十六街8号","高雄","13457789907","3232","huangxiaohu@qq.com") );
_customers.Add(new Customer(2, "李开复", "北京市东城区十六街8号", "北京", "136589907", "787222894", "huasdsdu@qq.com"));
_customers.Add(new Customer(3, "周杰伦", "台湾台北市十六街8号", "台北", "145455779907", "2323266", "232@qq.com"));
_customers.Add(new Customer(4, "郎咸平", "香港十六街8号", "香港", "145489907", "787222894", "6ggg@qq.com"));
_customers.Add(new Customer(5, "加菲猫", "高雄市十六街8号", "高雄市", "15777789907", "333434", "2323@qq.com"));
_customers.Add(new Customer(6, "灰太狼", "台湾第三代市十六街8号", "高雄市", "134357789907", "23232", "3232@qq.com"));
_customers.Add(new Customer(7, "喜洋洋", "台湾高雄市十六街8号", "高雄市", "134544589907", "23232777", "88sds@qq.com"));
_customers.Add(new Customer(8, "春哥", "台湾所得税十六街8号", "高雄市", "13453445907", "888888", "sdsgg@qq.com"));
}
}
public class Customer
{
public int ID { get; set; }
public string Name { get ; set; }
public string Address { get; set; }
public string City { get; set; }
public string Phone { get; set; }
public string QQ { get; set; }
public string Email { get; set; }
public Customer()
{ }
public Customer(
int id,
string name,
string address,
string city,
string phone,
string qq,
string email )
{
ID = id;
Name = name;
Address = address;
City = city;
PhonePhone = Phone;
QQ = qq;
Email = email;
}
}
}

App.xaml 程序初始化处理

<Application x:Class="MvvmLight5.App"
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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
xmlns:vm="clr-namespace:MvvmLight5.ViewModel">
<Application.Resources>
<vm:ViewModelLocator x:Key="Locator"
d:IsDataSource="True" />
</Application.Resources>
<Application.ApplicationLifetimeObjects>
<shell:PhoneApplicationService Launching="Application_Launching"
Closing="Application_Closing"
Activated="Application_Activated"
Deactivated="Application_Deactivated" />
</Application.ApplicationLifetimeObjects>
</Application>

// 清理ViewModel资源
      private void Application_Closing( object sender, ClosingEventArgs e )
      {
         ViewModelLocator.ClearMain();
      }

转载于:https://blog.51cto.com/linzheng/1078630

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