**
**附件是DataGrid支持滚动条的文件。 具体使用如下：
1）DataGrid使用控件模板
~~~
<Setter Property="Template" Value="{DynamicResource grdStudyListDataGridControlTemplate}">
~~~
~~~
~~~
<ControlTemplate x:Key="grdStudyListDataGridControlTemplate" TargetType="{x:Type DataGrid}">
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="True" CornerRadius="9">
<ScrollViewer x:Name="DG_ScrollViewer" AutomationProperties.AutomationId="PADG_ScrollViewer" Focusable="false">
<ScrollViewer.Template>
<ControlTemplate TargetType="{x:Type ScrollViewer}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<!--<Button Command="{x:Static DataGrid.SelectAllCommand}" Focusable="false"
Style="{DynamicResource {ComponentResourceKey ResourceId=DataGridSelectAllButtonStyle, TypeInTargetAssembly={x:Type DataGrid}}}"
Width="{Binding CellsPanelHorizontalOffset, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" Visibility="Collapsed" Margin="0"/>-->
<ScrollViewer x:Name="scvColHeaders" AutomationProperties.AutomationId="scvPAColHeaders" Grid.Column="1" Margin="0,0,0,0" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"
HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Disabled" Template="{DynamicResource ScrollViewerControlTemplate1}"
>
<ScrollViewer.Resources>
<ControlTemplate x:Key="ScrollViewerControlTemplate1" TargetType="{x:Type ScrollViewer}">
<Grid x:Name="Grid" AutomationProperties.AutomationId="PAGrid" Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Rectangle x:Name="Corner" AutomationProperties.AutomationId="PACorner" Grid.Column="1" Fill="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" Grid.Row="1"/>
<ScrollContentPresenter x:Name="PART_ScrollContentPresenter" AutomationProperties.AutomationId="PAPART_ScrollContentPresenter" CanContentScroll="{TemplateBinding CanContentScroll}" CanHorizontallyScroll="False"
CanVerticallyScroll="False" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}"
Grid.Column="0" Margin="{TemplateBinding Padding}" Grid.Row="0"/>
<ScrollBar x:Name="PART_VerticalScrollBar" AutomationProperties.AutomationId="VerticalScrollBar" Cursor="Arrow" Grid.Column="1"
Maximum="{TemplateBinding ScrollableHeight}" Minimum="0" Grid.Row="0" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportHeight}"
ContextMenu="{x:Null}"/>
<ScrollBar x:Name="PART_HorizontalScrollBar" AutomationProperties.AutomationId="HorizontalScrollBar" Cursor="Arrow" Grid.Column="0"
SmallChange="20"
Maximum="{TemplateBinding ScrollableWidth}" Minimum="0" Orientation="Horizontal" Grid.Row="1"
Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportWidth}"
ContextMenu="{x:Null}"/>
</Grid>
</ControlTemplate>
</ScrollViewer.Resources>
<DataGridColumnHeadersPresenter x:Name="PART_ColumnHeadersPresenter" AutomationProperties.AutomationId="PAPART_ColumnHeadersPresenter" VirtualizingStackPanel.IsVirtualizing="False" VirtualizingStackPanel.VirtualizationMode="Standard"
Visibility="{Binding HeadersVisibility, ConverterParameter={x:Static DataGridHeadersVisibility.Column}, Converter={x:Static DataGrid.HeadersVisibilityConverter}, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
Height="Auto" Width="Auto" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch"
ItemsPanel="{DynamicResource ItemsPanelTemplate1}" Style="{DynamicResource DataGridColumnHeadersPresenterStyle1}"
>
<DataGridColumnHeadersPresenter.Resources>
<ItemsPanelTemplate x:Key="ItemsPanelTemplate1">
<DataGridCellsPanel IsItemsHost="True" ScrollViewer.VerticalScrollBarVisibility="Disabled" />
</ItemsPanelTemplate>
<Style x:Key="DataGridColumnHeadersPresenterStyle1" TargetType="{x:Type DataGridColumnHeadersPresenter}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridColumnHeadersPresenter}">
<Grid>
<DataGridColumnHeader x:Name="PART_FillerColumnHeader" AutomationProperties.AutomationId="PAPART_FillerColumnHeader" IsHitTestVisible="False" Visibility="Collapsed"/>
<ItemsPresenter/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DataGridColumnHeadersPresenter.Resources>
</DataGridColumnHeadersPresenter>
</ScrollViewer>
<ScrollContentPresenter x:Name="PART_ScrollContentPresenter" AutomationProperties.AutomationId="PAPART_ScrollContentPresenter" CanContentScroll="{TemplateBinding CanContentScroll}" Grid.ColumnSpan="2" Grid.Row="1" />
<ScrollBar x:Name="PART_VerticalScrollBar" AutomationProperties.AutomationId="PAPART_VerticalScrollBar" Grid.Column="2" Maximum="{TemplateBinding ScrollableHeight}" Orientation="Vertical" Grid.Row="1"
Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportHeight}"
ContextMenu="{x:Null}"/>
<Grid Grid.Column="1" Grid.Row="2">
<Grid.ColumnDefinitions>
<!--<ColumnDefinition Width="{Binding NonFrozenColumnsViewportHorizontalOffset, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>-->
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ScrollBar Grid.Column="0"
SmallChange="20"
AutomationProperties.AutomationId="PA" Name="PART_HorizontalScrollBar"
Orientation="Horizontal"
Maximum="{TemplateBinding ScrollableWidth}"
ViewportSize="{TemplateBinding ViewportWidth}"
Value="{Binding Path=HorizontalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
ContextMenu="{x:Null}"/>
<ScrollBar x:Name="scbCustom" AutomationProperties.AutomationId="scbPACustom" Grid.Column="0" Orientation="Horizontal" Tag="{Binding ElementName=scvColHeaders}" Visibility="Visible"
SmallChange="20"
ContextMenu="{x:Null}">
<ScrollBar.Maximum>
<PriorityBinding>
<Binding RelativeSource="{RelativeSource AncestorType={x:Type ScrollViewer}}" Path="ScrollableWidth" Converter="{StaticResource ScrollableWidthConverter}"/>
<Binding ElementName="scvColHeaders" Path="ScrollableWidth" Mode="OneWay" />
</PriorityBinding>
</ScrollBar.Maximum>
<ScrollBar.Value>
<PriorityBinding>
<Binding RelativeSource="{RelativeSource TemplatedParent}" Path="HorizontalOffset" Mode="OneWay" Converter="{StaticResource ScrollableWidthConverter}"/>
<Binding ElementName="scvColHeaders" Path="HorizontalOffset" Mode="OneWay" />
</PriorityBinding>
</ScrollBar.Value>
<ScrollBar.ViewportSize>
<PriorityBinding>
<Binding RelativeSource="{RelativeSource TemplatedParent}" Path="ViewportWidth" Converter="{StaticResource ScrollableWidthConverter}" />
<Binding ElementName="scvColHeaders" Path="ViewportWidth" Mode="OneWay" />
</PriorityBinding>
</ScrollBar.ViewportSize>
</ScrollBar>
</Grid>
</Grid>
</ControlTemplate>
</ScrollViewer.Template>
<ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</ScrollViewer>
</Border>
</ControlTemplate>
2）实例化ValueConverter， 类似：
<McsfPAFEContainee_Converters:ScrollableWidthConverter x:Key="ScrollableWidthConverter" />
3）使用此类， 类似：
private DataGridScrollbarHelper _dtgScrollbarHelper;
dtgScrollbarHelper = new DataGridScrollbarHelper(this.grdStudyList);
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