Question

我有名为RoomAndPersonsAccommodationItem的自定义控件，里面有Property Room：

 public static readonly DependencyProperty roomProperty =
DependencyProperty.Register("Room", typeof(RoomData),
typeof(RoomAndPersonsAccommodationItem), new FrameworkPropertyMetadata(null));

        public RoomData RoomProperty
        {
            get { return GetValue(roomProperty) as RoomData; }
            set { SetValue(roomProperty, value); }
        }


        private RoomData room = null;
public RoomData Room
        {
            get { return room; }
            set { room = value; }
        }

RoomAndPersonsAccommodationItem在ListView上设置为DataTemplate：

<ListView Name="RoomsListView" HorizontalAlignment="Stretch"   VerticalAlignment="Stretch" >
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <StackPanel Orientation="Horizontal"></StackPanel>
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <Controls:RoomAndPersonsAccommodationItem Room="{Binding Path=., Mode=TwoWay}" HorizontalAlignment="Stretch" 
                                                                      VerticalAlignment="Stretch" />
                        </DataTemplate>
                    </ListView.ItemTemplate>

                </ListView>

在上面的ListView- RoomsListView类我有这个代码：

RoomsListView.ItemsSource = reservation.Rooms; 
//reservation.Rooms is List<RoomData>

问题在于：

<Controls:RoomAndPersonsAccommodationItem Room="{Binding Path=., Mode=TwoWay}" HorizontalAlignment="Stretch" 
                                                                          VerticalAlignment="Stretch" />

我想从ListView上的ItemSource将Room属性绑定到room对象，但是我收到null。有谁知道我哪里错了？也许在这里：Room =＆＃34; {Binding Path =。，Mode = TwoWay}＆＃34;或者在DependencyProperty声明？

由于马丁

更新

仍然无效......结果始终为空。我尝试了很多这样的选项来绑定Tag或DataContext但没有任何反应。我想这个问题不在DependencyProperty中。它是绑定我的东西...... 这是代码：

private ReservationData reservation = null;
//Methods
private void fillForms()
        {
            //Logic
                    RoomsListView.ItemsSource = reservation.Rooms;
            //Logic
        }

这是带有DataTemplate的ListView：

<ListView Name="RoomsListView" HorizontalAlignment="Stretch"   VerticalAlignment="Stretch" >
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <StackPanel Orientation="Horizontal"></StackPanel>
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <Controls:RoomAndPersonsAccommodationItem
                                Room="{Binding}"
                                HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
                        </DataTemplate>
                    </ListView.ItemTemplate>

                </ListView>

RoomAndPersonsAccommodationItem中的DependencyProperty：

public static readonly DependencyProperty RoomProperty =
    DependencyProperty.Register(
        "Room", typeof(RoomData), typeof(RoomAndPersonsAccommodationItem),
        new FrameworkPropertyMetadata(null));

        public RoomData Room
        {
            get { return (RoomData)GetValue(RoomProperty); }
            set { 
                SetValue(RoomProperty, value); }
        }

更新2

已解决 以上来源是正确的。错误的结果来自于我在构造函数完成之前检查了Room属性。当我在构造函数之后检查结果时一切正常！谢谢！

Answer 1

试试这个，该属性的一个属性和一个依赖属性：

public static readonly DependencyProperty RoomProperty =
    DependencyProperty.Register(
        "Room", typeof(RoomData), typeof(RoomAndPersonsAccommodationItem),
        new FrameworkPropertyMetadata(null)); 

public RoomData Room
{
     get { return (RoomData)GetValue(RoomProperty); }
     set { SetValue(RoomProperty, value); }
}

您还可以删除＆＃34;路径＆＃34;从绑定来看，没有必要。

wpf自定义控件本地属性绑定

1 个答案: