这个简单的解决方案"仅适用于可冻结的页脚，冻结的页眉解决方案会有所不同(实际上更容易 - 只需使用 HeaderTeamplate -放置一个堆叠面板，其中可以堆叠任意数量的项目).

This "Simple solution" is only for a freezable footer, the frozen header solution would be a bit different (and actually much easier - just play with the HeaderTeamplate - put a stack panel with as many items stacked up as you want).

所以我需要一个可冻结的页脚行，几个月来我找不到任何东西，所以最后我决定停止偷懒并进行调查.

So I needed a footer row that is freezable, I couldn't find anything for months, so finally I decided to stop being lazy and investigate.

因此，如果您需要页脚，要点是在行和水平滚动查看器之间的 DataGrid 模板中找到一个位置，您可以在其中使用带有单元格的 ItemsControl 挤压额外的 Grid.Row.

So if you need a footer, the gist is find a place in DataGrid's Template between the rows and the horizontal scrollviewer where you can squeeze extra Grid.Row with an ItemsControl with Cells.

攻击计划:

首先，提取DataGrid 模板(我使用Blend).熟悉模板后，按顺序记下各个部分:

First, extract the DataGrid template (I used Blend). When getting familiarized with the template, note the parts in order:

 PART_ColumnHeadersPresenter
 PART_ScrollContentPresenter
 PART_VerticalScrollBar

在 PART_VerticalScrollBar 的正下方，有一个网格(为了清楚起见，我会在这里发布)

right under PART_VerticalScrollBar, there is a grid (I'll post it here for clarity)

<Grid Grid.Column="1" Grid.Row="2">
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="{Binding NonFrozenColumnsViewportHorizontalOffset, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>
      <ColumnDefinition Width="*"/>
   </Grid.ColumnDefinitions>
   <ScrollBar x:Name="PART_HorizontalScrollBar" Grid.Column="1" Maximum="{TemplateBinding ScrollableWidth}" Orientation="Horizontal" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportWidth}"/>
</Grid>

这是我修改为包含可冻结/页脚行"的网格.为了简单起见，我将只对颜色进行硬编码，并用希望有用的假装"属性替换 Binding(我将它们标记为MyViewModel.SomeProperty，以便于查看):

That's the grid I modified to include a "freezable/footer row". I am going to just hard-code colors, and replace Binding with hoperfully helpful "pretend" properties for simplicity (I'll mark them "MyViewModel.SomeProperty so they are easy to see):

<Grid Grid.Column="1" Grid.Row="2" x:Name="PART_DataGridColumnsVisualSpace">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=NonFrozenColumnsViewportHorizontalOffset}"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
    </Grid.RowDefinitions>
    <ScrollBar Grid.Column="2" Grid.Row="3" Name="PART_HorizontalScrollBar" Orientation="Horizontal" 
           Maximum="{TemplateBinding ScrollableWidth}" ViewportSize="{TemplateBinding ViewportWidth}"
           Value="{Binding Path=HorizontalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
           Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>

    <Border x:Name="PART_FooterRowHeader" Grid.Row="1" Height="30" Background="Gray" BorderBrush="Black" BorderThickness="0.5">
    <TextBlock Margin="4,0,0,0" VerticalAlignment="Center">MY FOOTER</TextBlock>
    </Border>
    <ItemsControl x:Name="PART_Footer" ItemsSource="{Binding MyViewModel.FooterRow}"
              Grid.Row="1" Grid.Column="1" Height="30">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Border Background="Gray" BorderThickness="0,0,0.5,0.5" BorderBrush="Black">
                     <!-- sticking a textblock as example, i have a much more complex control here-->
                    <TextBlock Text="{Binding FooterItemValue}"/>
                </Border>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
        <ItemsControl.Template>
            <ControlTemplate>
                <ScrollViewer x:Name="PART_Footer_ScrollViewer" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" 
                          CanContentScroll="True" Focusable="false">
                    <StackPanel IsItemsHost="True" Orientation="Horizontal"/>
                </ScrollViewer>
            </ControlTemplate>
        </ItemsControl.Template>
    </ItemsControl>
</Grid>

还添加到 DataGrid 响应滚动和标题调整大小

Also add to DataGrid respond to scroll and header resize

<DataGrid ... ScrollViewer.ScrollChanged="OnDatagridScrollChanged"

<Style TargetType="DataGridColumnHeader">
    <EventSetter Event="SizeChanged" Handler="OnDataColumnSizeChanged"/>
</Style>

现在，回到 .xaml.cs

Now, back in .xaml.cs

基本上需要两个主要的东西:

Basically two main things are needed:

(1) 同步列调整大小(以便相应的页脚单元调整大小)(2) 同步 DataGrid 滚动与页脚滚动

(1) sync column resize (so that corresponding footer cell resizes) (2) sync DataGrid scroll with footer scroll

//syncs the footer with column header resize
private void OnDatagridScrollChanged(object sender, ScrollChangedEventArgs e)
{
    if (e.HorizontalChange == 0.0) return;
    FooterScrollViewer.ScrollToHorizontalOffset(e.HorizontalOffset);
}

//syncs scroll
private void OnDataColumnSizeChanged(object sender, SizeChangedEventArgs e)
{
    //I don't know how many of these checks you need, skip if need to the gist
    if (!_isMouseDown) return;
    if (!_dataGridLoaded) return;
    if (!IsVisible) return;

     var header = (DataGridColumnHeader)sender;
     var index = header.DisplayIndex - ViewModel.NumberOfHeaderColumns;

     if (index < 0 || index >= FooterCells.Count) return;

     FooterCells[index].Width = e.NewSize.Width;
}

//below referencing supporting properties:
private ScrollViewer _footerScroll;
private ScrollViewer FooterScrollViewer
{
    get {
        return _footerScroll ??
              (_footerScroll = myDataGrid.FindVisualChildByName<ScrollViewer>("PART_Footer_ScrollViewer"));
        }
}

//added this so I don't have to hunt them down from XAML every time
private List<Border> _footerCells;
private List<Border> FooterCells
{
    get
    {
        if (_footerCells == null)
        {
            var ic = myDataGrid.FindVisualChildByName<ItemsControl>("PART_Footer");
            _footerCells = new List<Border>();
            for (var i = 0; i < ic.Items.Count; i++)
            {
               var container = ic.ItemContainerGenerator.ContainerFromIndex(i);                             
               var border = ((Visual)container).FindVisualChild<Border>();
              _footerCells.Add(border);
            }
         }
         return _footerCells;
    }
}

就是这样！我认为最重要的部分是 XAML 以查看您可以将可冻结行"放在哪里，其他所有内容，例如操作/同步事物都非常容易 - 几乎是一个衬垫)

that's it! I think the most important part is the XAML to see where you can put your "freezable row", everything else, like manipulating/sync'ing things is pretty easy - almost one liners)