如何从需要单个参数的方法填充 XAML 列表框项？

Question

所以我有一个列表框：

<ListBox Grid.Row="0" Grid.Column="1" Grid.RowSpan="2"> //<----Item's Data Source Method Call Here?
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel
             Orientation="Horizontal"
             IsItemsHost="true"  />
        </ItemsPanelTemplate>
     </ListBox.ItemsPanel>
     <ListBox.ItemTemplate>
       <DataTemplate>
          <StackPanel Grid.Row="0" Grid.Column="1" Grid.RowSpan="2" Orientation="Vertical">
             <Label Content="{Binding Address1}"></Label>
             <Label Content="{Binding Address2}"></Label>
             <Label Content="{Binding Town}"></Label>
             <Label Content="{Binding Postcode}"></Label>
             <Label Content="{Binding Country}"></Label>
             <CheckBox Content="{Binding Include}"></CheckBox>
          </StackPanel>
       </DataTemplate>
     </ListBox.ItemTemplate>
</ListBox>

我想做的是将项目的数据源设置为地址列表，所有这些地址都具有相同的邮政编码。所以我需要一个具有相同邮政编码的 Observable Collection 中的当前地址列表。要生成这样的地址列表，只需调用接受当前邮政编码作为参数的方法，但我不知道如何调用需要来自静态数据源的参数的方法。

谁能帮忙？

Answer 1

使用 Collection 属性和 PostCode 属性创建一个视图。绑定 PostCode TwoWay，让 setter 为 Collection 属性引发 OnPropertyChanged，让 collection 属性根据 PostCode 属性的当前值返回一个集合。

internal class MyView : INotifyPropertyChanged {
   private string _postCode;

   public string PostCode {
      get { return _postCode; }
      set {
         _postCode = value;
         OnPropertyChanged("PostCode");
         OnPropertyChanged("FilteredItems");
      }
   }

   public ObservableCollection<Address> Items { get; set; }

   public IEnumerable<Address> FilteredItems {
      get { return Items.Where(o => o.PostCode == _postCode).ToArray(); }
   }

   public event PropertyChangedEventHandler PropertyChanged;

   private void OnPropertyChanged( string propertyName ) {
      if( PropertyChanged != null ) {
         PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
      }
   }
}

<Grid DataContext="{Binding Path=myViewInstance}">
   <TextBox Text="{Binding Path=PostCode, Mode=TwoWay}"/>
   <ListBox Grid.Row="0" Grid.Column="1" Grid.RowSpan="2" ItemsSource="{Binding Path=FilteredItems}">
      <ListBox.ItemsPanel>
         <ItemsPanelTemplate>
            <VirtualizingStackPanel
               Orientation="Horizontal"
               IsItemsHost="true"  />
         </ItemsPanelTemplate>
      </ListBox.ItemsPanel>
      <ListBox.ItemTemplate>
         <DataTemplate>
            <StackPanel Grid.Row="0" Grid.Column="1" Grid.RowSpan="2" Orientation="Vertical">
               <Label Content="{Binding Address1}"></Label>
               <Label Content="{Binding Address2}"></Label>
               <Label Content="{Binding Town}"></Label>
               <Label Content="{Binding PostCode}"></Label>
               <Label Content="{Binding Country}"></Label>
               <CheckBox Content="{Binding Include}"></CheckBox>
            </StackPanel>
         </DataTemplate>
      </ListBox.ItemTemplate>
   </ListBox>
</Grid>

注意：我的“地址”类可能与你的不同。