如何从listview获取selecteditems属性

我创建了一个列表视图，其中的项目按不同的类别排序 . 我试图让listview的selectedItem进入我的Viewmodel中的属性，我已经遵循常规方法简单地设置绑定到SelectedItem属性 .

但是，因为我现在实际上只将datacontext设置为我的可观察集合，而不是触及ItemsSource属性（或者我是吗？），我相信我缺少一些奇特的xaml代码来使SelectedItem的绑定工作 . 希望有人遇到过类似的问题 . xaml代码和viewmodel中声明的2个属性在下面显示 .

<UserControl.Resources>
    <CollectionViewSource x:Key="TileChangeType"                               
                  Source="{Binding TileChangeList.TileChangeListEntries}">
        <CollectionViewSource.GroupDescriptions>
            <PropertyGroupDescription PropertyName="Type" />
        </CollectionViewSource.GroupDescriptions>
    </CollectionViewSource>
</UserControl.Resources>
<ListView Grid.Column="0" x:Name="gridTiles" VirtualizingPanel.IsVirtualizing="False" VirtualizingPanel.IsVirtualizingWhenGrouping="False"
                      DataContext="{StaticResource TileChangeType}"
                      SelectedItem="{Binding SelectedTileChange}"
      ItemsSource="{Binding IsAsync=True}">


            <ListView.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Expander IsExpanded="True">
                                            <Expander.Header>
                                                <TextBlock Background="Aqua" Text="{Binding Path=Name}"/>
                                            </Expander.Header>
                                            <ItemsPresenter />
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                    <GroupStyle.Panel>
                        <ItemsPanelTemplate>
                            <DataGridRowsPresenter/>
                        </ItemsPanelTemplate>
                    </GroupStyle.Panel>
                </GroupStyle>
            </ListView.GroupStyle>
            <ListView.View>
                <GridView>
                    <GridView.Columns>
                        <GridViewColumn Header="X" DisplayMemberBinding="{Binding X}" />
                        <GridViewColumn Header="Y" DisplayMemberBinding="{Binding Y}" />
                        <GridViewColumn Header="Z" DisplayMemberBinding="{Binding Z}" />
                        <GridViewColumn Header="Type" DisplayMemberBinding="{Binding Type}" Width="40"/>
                    </GridView.Columns>
                </GridView>
            </ListView.View>

            </ListView>

模型“SelectedTileChange”声明如下：

public TileChange SelectedTileChange
    {
        get;
        set;
    }

    //Class contains an Observable Collection of the TileChange class (same class as SelectedItem is binding to)
    //E.g. ObservableCollection<TileChange> tileChangeListEntries;
    public TileChangeList TileChangeList
    {
        get;
        set;
    }