项目要用到复选框,但是在Silverlight中不存在CheckBoxList,通过查阅资料以及根据自己的理解,写了简单示例:
1.XAML
<UserControl x:Class="SilverlightApplication1.CheckboxList" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:SilverlightApplication1" xmlns:controlsToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <ListBox x:Name="lst"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <controlsToolkit:WrapPanel Orientation="Vertical" Height="30" /> </ItemsPanelTemplate> </ListBox.ItemsPanel> </ListBox> </Grid> </UserControl>
其中这里要引用Silverlight 3 Toolkit中的WrapPanel面板
xmlns:controlsToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
2.CS
namespace SilverlightApplication1 { public partial class CheckboxList : UserControl { #region 属性注册 public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(CheckboxList), new PropertyMetadata(null, ItemsSourceChanged)); public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.Register("SelectedItems", typeof(IEnumerable), typeof(CheckboxList), new PropertyMetadata(null)); public static readonly DependencyProperty DisplayMemberPathProperty = DependencyProperty.Register("DisplayMemberPath", typeof(string), typeof(CheckboxList), new PropertyMetadata(string.Empty)); private static ObservableCollection<InternalModel> _internalCollection; /// <summary> /// 数据源 /// </summary> public IEnumerable ItemsSource { get { return GetValue(ItemsSourceProperty) as ObservableCollection<object>; } set { SetValue(ItemsSourceProperty, value); } } /// <summary> /// 选择项 /// </summary> public ObservableCollection<object> SelectedItems { get { return GetValue(SelectedItemsProperty) as ObservableCollection<object>; } set { SetValue(SelectedItemsProperty, value); } } /// <summary> /// 显示字段 /// </summary> public string DisplayMemberPath { get { return GetValue(DisplayMemberPathProperty) as string; } set { SetValue(DisplayMemberPathProperty, value); if (value != null) lst.ItemTemplate = (DataTemplate)XamlReader.Load( @"<DataTemplate xmlns=""http://schemas.microsoft.com/client/2007""> <CheckBox Content=""{Binding Value." + DisplayMemberPath + @", Mode=TwoWay}"" IsChecked=""{Binding Selected, Mode=TwoWay}""/> </DataTemplate>"); } } private static void ItemsSourceChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { ((CheckboxList)obj).BuildInternalCollection(e.NewValue as IEnumerable); } private void BuildInternalCollection(IEnumerable collection) { _internalCollection = new ObservableCollection<InternalModel>(); foreach (var obj in collection) { var nContainerItem = new InternalModel { Selected = false, Value = obj }; nContainerItem.PropertyChanged += nContainerItem_PropertyChanged; _internalCollection.Add(nContainerItem); } lst.ItemsSource = _internalCollection; } void nContainerItem_PropertyChanged(object sender, PropertyChangedEventArgs e) { if (SelectedItems == null) SelectedItems = new ObservableCollection<object>(); SelectedItems.Clear(); foreach (var o in _internalCollection.Where(internalModel => internalModel.Selected)) SelectedItems.Add(o.Value); } #endregion public CheckboxList() { InitializeComponent(); SelectedItems = new ObservableCollection<object>(); } } public class InternalModel : INotifyPropertyChanged { public object Value { get; set; } private bool _selected; public bool Selected { get { return _selected; } set { _selected = value; NotifyPropertyChanged("Selected"); } } public event PropertyChangedEventHandler PropertyChanged; public void NotifyPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } } }
主页面调用的方法
1.XAML
<UserControl x:Class="SilverlightApplication1.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:SilverlightApplication1" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <UserControl.Resources> <local:People x:Key="folks"/> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="400"></RowDefinition> <RowDefinition Height="40"></RowDefinition> </Grid.RowDefinitions> <local:CheckboxList x:Name="checkboxlist" ItemsSource="{Binding AllPeople,Source={StaticResource folks},Mode=TwoWay}" DisplayMemberPath="Name"/> <Button Grid.Row="1" Content="显示选中项" Click="Button_Click" Width="60" HorizontalAlignment="Right" Margin="5"></Button> </Grid> </UserControl>
2.CS
namespace SilverlightApplication1 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { string msg = string.Empty; ObservableCollection<object> list = checkboxlist.SelectedItems; foreach (var obj in list) { Person per = obj as Person; msg += per.Name + "\n"; } MessageBox.Show(msg); } } public class Person { public int ID { get; set; } public string Name { get; set; } } public class People { public People() { AllPeople = (from a in Enumerable.Range(1, 10) select new Person { ID = a, Name = "Name: " + a } ).ToList(); } public List<Person> AllPeople { get; set; } } }
时间: 2024-08-07 00:10:48