我有一个带有自定义头的WPF DataGrid。DataGrid绑定到视图模型中的CollectionViewSource属性。datagrid列是在codebheath中创建的。
当我更改集合时，datagrid会更新并显示新数据。但是，自定义头不会更新-它仍然绑定到应该已经超出范围的旧对象。换句话说，报头仅在第一次被绑定。之后，即使ItemsSource发生了变化，它也会保留旧对象。
如何修复它，以便在数据更改时，头文件与数据网格的其余部分同时更新？

<DataGrid
                    AutoGenerateColumns="False"
                    CanUserAddRows="False" 
                    CanUserDeleteRows="False" 
                    CanUserReorderColumns="False" 
                    CanUserResizeRows="False" 
                    CanUserSortColumns="True"
                    IsReadOnly="True"
                    ItemsSource="{Binding Path=PreformDataListViewSource.View}">
</DataGrid>

<!-- Custom header -->
 <Style TargetType="{x:Type DataGridColumnHeadersPresenter}">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type DataGridColumnHeadersPresenter}">
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="30"></RowDefinition>
                                    <RowDefinition Height="30"></RowDefinition>
                                </Grid.RowDefinitions>

<!-- HEADER 1: Extra header row. For some reason, it does not re-bind when there are 
changes to the data. 
The ToggleButton will keep showing the status of an old out-of-scope object. -->
                                <StackPanel Orientation="Horizontal" 
                                            Grid.Row="0" >
                                    <ItemsControl 
                                        ItemsSource="{TemplateBinding ItemsSource, diag:PresentationTraceSources.TraceLevel=High}">   
                                        <ItemsControl.ItemsPanel>
                                            <ItemsPanelTemplate>
                                                <StackPanel Orientation="Horizontal"/>
                                            </ItemsPanelTemplate>
                                        </ItemsControl.ItemsPanel>
                                        <ItemsControl.ItemTemplate>
                                            <DataTemplate>
                                                    <ToggleButton x:Name="btPlotHeader"
                                                            IsChecked="{Binding IsSelectedForPlotting, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged }"
                                                            Command="{Binding CommandPlotColumn}">
                                                    </ToggleButton>
                                            </DataTemplate>
                                        </ItemsControl.ItemTemplate>
                                    </ItemsControl>
                                </StackPanel>

                                <!-- HEADER 2: These 2 controls are the default header with sortable headings. -->
                                <DataGridColumnHeader 
                                    x:Name="PART_FillerColumnHeader" 
                                    Grid.Row="1"
                                    IsHitTestVisible="False" />
                                <ItemsPresenter Grid.Row="3" />

视图模型：

public class MyVM: BindableBase
{
        private ObservableCollection<PreformDataVM> preformDataList;

        public MyVM()
        {
            this.PreformDataList = new ObservableCollection<PreformDataVM>();
            this.PreformDataListViewSource = new CollectionViewSource()
            {
                Source = this.PreformDataList,
            };
        }

         /// <summary>
        /// Gets the CollectionViewSource. The purpose of this collection is to preserve 
          sorting when the data is reloaded / refreshed.
        /// </summary>
        public CollectionViewSource PreformDataListViewSource
        {
            get; private set;
        }

        public ObservableCollection<PreformDataVM> PreformDataList
        {
            get
            {
                return this.preformDataList;
            }

            set
            {
                this.SetProperty(ref this.preformDataList, value);
            }
        }
}