將ObservableCollection附加為ItemsControl的ItemsSource

Question

我有一個像這樣的對象：

class RCLocation : INotifyPropertyChanged
{
    private string _id;
    private string _name;
    private bool _checked;

    public string Id { /* get/set with NotifyPropertyChanged() */ }
    public string Name  { /* get/set with NotifyPropertyChanged() */ }
    public bool Checked { /* get/set with NotifyPropertyChanged() */ }

    /* INotifyPropertyChanged implementation methods */
}

現在在MainWindow.xaml中，有一個ItemsControl像這樣：

<ItemsControl Name="lstDropOff" ScrollViewer.VerticalScrollBarVisibility="Auto">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <CheckBox IsChecked="{Binding Checked, Mode=TwoWay}"/>
                <TextBlock Text="{Binding Name}"/>
            </StackPanel>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

我將數據綁定到我后面的代碼中的此列表中，如下所示：

ObservableCollection<RCLocation> dropOffs = new ObservableCollection<RCLocation>();
lstDropOff.ItemsSource = dropOffs;
dropOffs.Add(new RCLocation { /* some data here */ });
dropOffs.Add(new RCLocation { /* some data here */ });
dropOffs.Add(new RCLocation { /* some data here */ });
dropOffs.Add(new RCLocation { /* some data here */ });

我剛剛添加的項目未顯示在ItemsControl中。 我到底在做什么錯？ 無法解決：/
感謝幫助。

Answer 1

您尚未使用綁定設置ItemsSource ，需要進行此操作才能涉及WPF綁定引擎並使控件對數據源更改做出反應。

這是從背后的代碼中做到的：

// instead of lstDropOff.ItemsSource = dropOffs
var binding = new Binding() { Source = dropOffs };
lstDropOff.SetBinding(ItemsControl.ItemsSourceProperty, binding);

Answer 2

您的代碼沒問題，我嘗試使用此代碼...並顯示在您的xaml代碼中

using PhoneApp4.Resources;
using System.ComponentModel;
using System.Collections.ObjectModel;
using Microsoft.Phone.Controls;

namespace PhoneApp4
{
    public partial class MainPage : PhoneApplicationPage
    {
        public MainPage()
        {
            InitializeComponent();

            ObservableCollection<RCLocation> dropOffs = new ObservableCollection<RCLocation>();
            lstDropOff.ItemsSource = dropOffs;
            dropOffs.Add(new RCLocation { Id = "1", Name = "Tester", Checked = true });
            dropOffs.Add(new RCLocation { Id = "1", Name = "Tester", Checked = true });
            dropOffs.Add(new RCLocation { Id = "1", Name = "Tester", Checked = true });
            dropOffs.Add(new RCLocation { Id = "1", Name = "Tester", Checked = true });
        }
    }

    class RCLocation 
    {
        private string _id;
        private string _name;
        private bool _checked;

        public string Id { get; set; }
        public string Name { get; set; }
        public bool Checked { get; set; }
    }
}