c# - 绑定(bind)到XAML中的用户控件集合

我有一个要在堆栈面板中显示的UserControls集合。我无法控制这些用户控件的内容和方式。我只知道它们是某种用户控件（可以是按钮，文本块或任何UIElement。）
这是一个小例子

public class Car : IHasView
{
     public UserControl MyView { get return new MyCarViewThatHasAButton(); }
}

public class Jeep : IHasView
{
    public UserControl MyView { get return new MyJeepViewThatHasATextblock(); }
}

public class MainView : INotifyPropertyChanged{
    private ICollection _myViews;
    public ICollection MyViews {
    get { return _myViews;}
    set{
       _myViews = value;
       NotifyPropertyChanged("MyViews");
    }

...
...
}

在此示例中，我想绑定到MyViews并在堆栈面板中显示集合中的所有视图。我应该如何绑定它？我是WPF世界的新手。

谢谢。

最佳答案

这是一种方法的示例。

如果您只想使用默认的ItemsPanel模板（垂直堆栈面板），则可以删除ItemsControl的ItemsControl.ItemsPanel部分-我只是多余地包含了它，因此您可以查看StackPanel的实际位置，或者是否要更改StackPanel某种程度上来说。

HasTemplateItemTemplate的键名显式引用ItemTemplate，因为您的数据项是接口类型，因此您不能隐式应用数据模板。

[您可能需要做更多的工作，例如在MyCarViewThatHasAButton和MyCarViewThatHasAButton上使用单例，为NotifyPropertyChanged使用更好的模式，等等。]

<Window x:Class="WpfApplication3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:WpfApplication3="clr-namespace:WpfApplication3" Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <WpfApplication3:MainView x:Key="MainView"/>
        <DataTemplate x:Key="HasViewItemTemplate">
            <ContentPresenter Content="{Binding Path=MyView}"/>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <ItemsControl Background="Yellow" ItemTemplate="{StaticResource HasViewItemTemplate}" ItemsSource="{Binding Source={StaticResource MainView}, Path=MyViews}">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel Orientation="Vertical"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>
    </Grid>
</Window>



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Collections;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace WpfApplication3
{
    public interface IHasView
    {
        UserControl MyView { get; }
    }

    public class Car : IHasView
    {
        public UserControl MyView
        {
            get
            {
                // Demo UserControl as prodcued by MyCarViewThatHasAButton

                UserControl ctl = new UserControl();

                ctl.Background = Brushes.Red;

                Button button = new Button();

                button.Content = "a car";

                ctl.Content = button;

                return ctl;
            }
        }
    }

    public class Jeep : IHasView
    {
        public UserControl MyView
        {
            get
            {
                // Demo UserControl as produced by MyJeepViewThatHasATextblock

                UserControl ctl = new UserControl();

                ctl.Background = Brushes.Blue;
                ctl.Width = 50;

                TextBlock textblock = new TextBlock();

                textblock.Text = "a jeep";

                ctl.Content = textblock;

                return ctl;
            }
        }
    }

    public class MainView : INotifyPropertyChanged{

        public MainView()
        {
            ObservableCollection<IHasView> list = new ObservableCollection<IHasView>()
                                                      {
                                                          new Car(),
                                                          new Jeep()
                                                      };

            MyViews = list;
        }

        private ICollection _myViews;
        public ICollection MyViews
        {
            get
            {
                return _myViews;
            }
            set
            {
               _myViews = value;
               NotifyPropertyChanged("MyViews");
            }
        }

        private void NotifyPropertyChanged(string p)
        {
            if (PropertyChanged != null)
            {
                PropertyChangedEventArgs e = new PropertyChangedEventArgs(p);

                PropertyChanged(this, e);
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}

关于c# - 绑定(bind)到XAML中的用户控件集合，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/3713092/