我创建了一个简单的项目，它显示了一个包含复选框的项目的列表框。当用户选择多个项目的复选框时，将检查下面（显示区域之外）的一些复选框，而无需用户交互。这个“幽灵”选择适用于大约的物品。第30位。
我试过了：
没有效果。
Code:
Class_Test_CheckBox.cs
using System;
using System.ComponentModel;
namespace App_Text_CheckBox
{
public class Class_Test_CheckBox : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private Int64 _idPoint;
private string _textContent;
private bool _selected;
private int _tag;
public Int64 IdPoint
{
get { return _idPoint; }
set
{
if (_idPoint != value)
{
_idPoint = value;
RaisePropertyChanged("IdPoint");
}
}
}
public string TextContent
{
get { return _textContent; }
set
{
if (_textContent != value)
{
_textContent = value;
RaisePropertyChanged("TextContent");
}
}
}
public bool Selected
{
get { return _selected; }
set
{
if (_selected != value)
{
_selected = value;
RaisePropertyChanged("Selected");
}
}
}
public int Tag
{
get { return _tag; }
set
{
if (_tag != value)
{
_tag = value;
RaisePropertyChanged("Tag");
}
}
}
protected void RaisePropertyChanged(string name)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
}
}
Page_Test_CheckBox.xaml:
<Page
x:Class="App_Text_CheckBox.Page_Test_CheckBox"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App_Text_CheckBox"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Page.Resources>
<!--Collection of items displayed by this page-->
<CollectionViewSource x:Name="itemsTestCheckBox"/>
</Page.Resources>
<Grid x:Name="LayoutRoot">
<Grid.ChildrenTransitions>
<TransitionCollection>
<EntranceThemeTransition/>
</TransitionCollection>
</Grid.ChildrenTransitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!-- Title Panel -->
<StackPanel Grid.Row="0" Margin="19,0,0,0">
<TextBlock Text="TEST APPLICATION" Style="{ThemeResource TitleTextBlockStyle}" Margin="0,12,0,0"/>
<TextBlock Text="Test CheckBox" Margin="0,-6.5,0,26.5" Style="{ThemeResource HeaderTextBlockStyle}" CharacterSpacing="{ThemeResource PivotHeaderItemCharacterSpacing}"/>
</StackPanel>
<!--TODO: Content should be placed within the following grid-->
<Grid Grid.Row="1" x:Name="ContentRoot" Margin="19,9.5,19,0">
<ListView
ItemsSource="{Binding Source={StaticResource itemsTestCheckBox}}"
ScrollViewer.HorizontalScrollMode="Disabled"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ScrollViewer.VerticalScrollMode="Auto"
ScrollViewer.VerticalScrollBarVisibility="Auto" >
<ListView.ItemTemplate >
<DataTemplate >
<Grid Margin="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="40"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Left">
<CheckBox x:Name="cb_Test_CheckBox" Tag="{Binding Tag}" IsChecked="{Binding Selected}" Checked="cb_Test_CheckBox_Checked" Unchecked="cb_Test_CheckBox_Unchecked" />
</Grid>
<TextBlock Grid.Column="1" Tag="{Binding Tag}" Text="{Binding TextContent}" TextWrapping="NoWrap" FontSize="16" VerticalAlignment="Center"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
</Grid>
</Page>
Page_Test_CheckBox.xaml.cs:
using App_Text_CheckBox.Common;
using System.Collections.ObjectModel;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkID=390556
namespace App_Text_CheckBox
{
public sealed partial class Page_Test_CheckBox : Page
{
private NavigationHelper navigationHelper;
private ObservableDictionary defaultViewModel = new ObservableDictionary();
// Test ObservableCollection
public ObservableCollection<Class_Test_CheckBox> ObservableCollection_Test_CheckBox = new ObservableCollection<Class_Test_CheckBox>();
public Page_Test_CheckBox()
{
this.InitializeComponent();
this.navigationHelper = new NavigationHelper(this);
this.navigationHelper.LoadState += this.NavigationHelper_LoadState;
this.navigationHelper.SaveState += this.NavigationHelper_SaveState;
}
public NavigationHelper NavigationHelper
{
get { return this.navigationHelper; }
}
public ObservableDictionary DefaultViewModel
{
get { return this.defaultViewModel; }
}
private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
}
private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e)
{
}
#region NavigationHelper registration
protected override void OnNavigatedTo(NavigationEventArgs e)
{
this.navigationHelper.OnNavigatedTo(e);
// Create 55 items
for (int ii = 0; ii < 55; ii++)
{
Class_Test_CheckBox newItem = new Class_Test_CheckBox();
newItem.IdPoint = (long)ii;
newItem.Selected = false; //for Binding CheckBox
newItem.Tag = ii;
newItem.TextContent = (ii + 1).ToString() + ". row - Lorem Ipsum Dolor ...";
ObservableCollection_Test_CheckBox.Add(newItem);
}
//items -> source
itemsTestCheckBox.Source = ObservableCollection_Test_CheckBox;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
this.navigationHelper.OnNavigatedFrom(e);
}
#endregion
private void cb_Test_CheckBox_Checked(object sender, RoutedEventArgs e)
{
int index = (int)((sender as CheckBox).Tag);
ObservableCollection_Test_CheckBox[index].Selected = true;
ObservableCollection_Test_CheckBox[index].TextContent = (index + 1).ToString() + ". row - LOREM IPSUM DOLOR " + index.ToString() + " " + ObservableCollection_Test_CheckBox[index].Selected.ToString();
}
private void cb_Test_CheckBox_Unchecked(object sender, RoutedEventArgs e)
{
int index = (int)((sender as CheckBox).Tag);
ObservableCollection_Test_CheckBox[index].Selected = false;
ObservableCollection_Test_CheckBox[index].TextContent = (index + 1).ToString() + ". row - lorem ipsum dolor " + index.ToString() + " " + ObservableCollection_Test_CheckBox[index].Selected.ToString();
}
}
}
有没有错误，或者如何避免重复选择？