Windows Phone 7 - Function for ListBox button

问题:

I have list of items in ListBox.
All the items have buttons.
I want to show the selected items name when I click the button inside the ListBox (Not the list box items).

My Xaml:-

<ListBox SelectedIndex="{Binding SelectedIndex,Mode=TwoWay}"  
         SelectedItem="{Binding SelectedStudent, Mode=TwoWay}" Height="374" 
         ItemsSource="{Binding StudentDetails,Mode=TwoWay}" 
         HorizontalAlignment="Left" Margin="2,6,0,0" Name="listBox1" 
         VerticalAlignment="Top" Width="476" BorderBrush="#00410D0D">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Tap">
            <i:InvokeCommandAction Command="{Binding EventPageCommand, Mode=OneWay}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Border BorderBrush="Gray" Padding="5" BorderThickness="1">
                <StackPanel Orientation="Horizontal">
                    <Border BorderBrush="Wheat" BorderThickness="1">
                        <Image Name="ListPersonImage" Source="{Binding PersonImage}" 
                               Height="100" Width="100" Stretch="Uniform" Margin="10,0,0,0"/>
                    </Border>
                    <TextBlock Text="{Binding FirstName}" Name="firstName" Width="200" 
                               Foreground="White" Margin="10,10,0,0" 
                               FontWeight="SemiBold" FontSize="22"  />

                    <Button Height="80" Width="80" Command="{Binding addPerson}" 
                            DataContext="{Binding DataContext, ElementName=listBox1}">
                        <Button.Background>
                            <ImageBrush 
                                ImageSource="/NewExample;component/Images/icon_increase.png" />
                        </Button.Background>
                    </Button>
                </StackPanel>
            </Border>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Here when I click the 'addPerson' Button it should show the selected items name.
Now I have write the coding for List box 'SelectedItmes'.

My ViewModel:-

 private MVVMListBoxModel selectedStudent;
public MVVMListBoxModel SelectedStudent
{
    get { return selectedStudent; }
    set
    {
        if (selectedStudent == value)
            return;
        selectedStudent = value;
        MessageBox.Show("Selected Item==>" + selectedStudent.FirstName + " Selected Index==>" + SelectedIndex);
        if (SelectedIndex == 0)
        {
            var rootFrame = (App.Current as App).RootFrame;
            rootFrame.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
        }
    }
}

Here I can show the selected Name when I click the list box items.
But now I want to show when I click the button.
Is it possible to show the items when I click the button?

Now I have tried like this:-

public ReactiveAsyncCommand addPerson { get; set; }

public MVVMListBoxViewModel()
{
    addPerson = new ReactiveAsyncCommand();
    addPerson.Subscribe(x =>
    {
        MessageBox.Show("Button Clicked..!!");
            ListBox listbox = (ListBox)sender;
            ListBoxEventsModel items = (ListBoxEventsModel)listbox.SelectedItem;
            MessageBox.Show("Selected Name" + items.ToString());
    });
}

But here I can not show the selected items.
Please let me any idea to solve this issue.

回答1:

To make sure that your code is working Make some tests like this:

<Button Tap="btnTestCommand_Tap" Height="80" Width="80" Command="{Binding addPerson}" 
        DataContext="{Binding DataContext, ElementName=listBox1}">
    <Button.Background>
        <ImageBrush ImageSource="/NewExample;component/Images/icon_increase.png" />
    </Button.Background>
</Button>

Code behind:

private void btnTestCommand_Tap(object sender, GestureEventArgs e)
{
    Button btn=sender as Button;
    var command = btn.Command;
    MessageBox.Show("Entering Command Check\n DataContext is of type: "+btn.DataContext.GetType().Name);

    if(command !=null)
    {
        MessageBox.Show("Command is not null");
        if(command is ReactiveAsyncCommand)
        {
            MessageBox.Show("Command is of ReactiveAsyncCommand type");
        }
    }
}