在WindowsPhone8中生成基于MVVM Light的LongListSelector命令绑定

继续《在WindowsPhone8中生成基于MVVM Light的LongListSelector拼音检索绑定》一文,项目不再引用上一个项目,但功能实现相同,我们已经对数据作了绑定,下面要携带参数传值导航至具体内容页:

1.在引用中添加

    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
    xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP71"

 2.绑定命令:我实现的功能为:单机LongListSelector的某个项(此例中为文本框),跳转至相应页面(ContentPage)内容页

<phone:LongListSelector
                   x:Name="MountainIndexLLS"
                   JumpListStyle="{StaticResource AddrBookJumpListStyle}"
                   Background="Transparent"
                   GroupHeaderTemplate="{StaticResource AddrBookGroupHeaderTemplate}"        
                   LayoutMode="List"
                   IsGroupingEnabled="true"
                   HideEmptyGroups ="true" ItemsSource="{Binding DataSource}">
                    <phone:LongListSelector.ItemTemplate>
                        <DataTemplate>
                            <StackPanel VerticalAlignment="Top">
                                <TextBlock FontWeight="Bold"  Text="{Binding Name}" Style="{StaticResource PhoneTextLargeStyle}" FontFamily="{StaticResource PhoneFontFamilySemiBold}" Foreground="White"/>
                                <TextBlock Text="{Binding Region}" Style="{StaticResource PhoneTextNormalStyle}" TextWrapping="Wrap" FontFamily="{StaticResource PhoneFontFamilySemiBold}" Foreground="Gray"/>
                            </StackPanel>
                        </DataTemplate>  
                    </phone:LongListSelector.ItemTemplate>
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="Tap">
                            <cmd:EventToCommand Command="{Binding TapCommand}" CommandParameter="{Binding SelectedItem,ElementName=MountainIndexLLS}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </phone:LongListSelector>

 

 在这里,我们将上例中的LongListSelector中LongListSelector.ItemTemplate的样式代码由PhoneApplicationPage.Resources中转移到了LongListSelector中,在这里,每一个LongListSelector项均被绑定了一个TapCommand的命令,下面,我们在MainViewModel中完成这条命令,实现我们需要的功能。

3.写命令代码:(MainViewModel)

public RelayCommand<MountainIndex> TapCommand { get; private set; }
        public void NavigationTap(MountainIndex mouIndex)
        {
            System.Windows.MessageBox.Show(mouIndex.Name+mouIndex.Region);
        }

 我们先不实现导航,仅仅是取得文本框的内容

public MainViewModel()
        {
            TapCommand = new RelayCommand<MountainIndex>((mouIndex) => NavigationTap(mouIndex));
        }

 实现结果如下:

 

 

 

posted @ 2013-05-20 10:19  valentine is me  阅读(303)  评论(0编辑  收藏  举报