DataGridColum的bug

Datagrid有多个bug；

1，不支持DynamicResource的东西

2， 在Column隐藏后再显示， ColumnHeader的Tag或者DataContext为null。

解决办法：

用StaticResource ，如下面的 StaticResource DGC_ContentTemplate；

用DataGridColumnHeader的Column，来取得上层的datacontext。如， ItemsSource="{Binding Path=Column.Tag, Converter ={StaticResource DebugConverter}, Mode=OneWay, RelativeSource={RelativeSource   FindAncestor, AncestorType={x: Type DataGridColumnHeader}}}"

   private void InitDataGridBinding (DataGridColumnEx col, string path)

        {

            if (null == col || String.IsNullOrWhiteSpace (path) || null == col .Header)

            {

                return;

            }

            Binding binding = new Binding();

            binding.Mode = BindingMode. OneWay;

            binding.RelativeSource = new RelativeSource(RelativeSourceMode .Self);

            binding.Converter = new BoolToVisibilityConverter();

            binding.Path = new PropertyPath("(FrameworkElement.DataContext).PACfgVM." + path + ".CfgInfo[" + PAAttachedProperty. GetName(col ) + "].IsVisiable");

            BindingOperations.SetBinding (col, DataGridColumnEx.VisibilityProperty , binding);

            //{for combobox binding in columnHeader

            col.Tag = PAAttachedProperty. GetTag(col );

            DependencyPropertyDescriptor dpd = DependencyPropertyDescriptor .FromProperty( DataGridColumnEx.VisibilityProperty , typeof(DataGridColumnEx ));

            if (dpd != null)

            {

                dpd.AddValueChanged (col, delegate

                {

                    //

                    InitDataGridColumnHeader(col , GetDataGridParent( col));

                });

            }

            //}

        }

             <DataTemplate x :Key="DGC_ContentTemplate">

                <TextBlock TextWrapping ="Wrap" Text="{ Binding }" MinWidth ="20"/>

            </DataTemplate>

  <Style x:Key ="DataGridColumnHeaderStyle_ComboBox" TargetType="{x :Type DataGridColumnHeader}">

                <Setter Property ="ContentTemplate" Value="{ StaticResource DGC_ContentTemplate}"/>

                <Setter Property ="VerticalContentAlignment" Value="Center"/>

                                 <Setter Property ="Template">

                                                 <Setter.Value>

                                                                 <ControlTemplate TargetType ="{x: Type DataGridColumnHeader}">

                            <Grid>

                                                                                                 <StackPanel Orientation ="Vertical" d:LayoutOverrides="Height" Margin="10">

                                    <Label Foreground ="Black" HorizontalContentAlignment="Left" Content="{TemplateBinding Content }"/>

                                    <!--<ComboBox Margin="0,10,0,0" ItemsSource="{Binding (FrameworkElement.Column.).TimeSearchGroup, Converter={StaticResource DebugConverter}, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}"/>-->

                                    <!--<ComboBox Margin="0,10,0,0"

                                              ItemsSource="{Binding Path=Tag, Converter={StaticResource DebugConverter}, Mode=OneWay, RelativeSource={RelativeSource  FindAncestor, AncestorType={x:Type DataGridColumnHeader}}}"></ComboBox>-->

                                    <ComboBox Margin ="0,10,0,0"

                                              ItemsSource="{Binding Path=Column.Tag, Converter ={StaticResource DebugConverter}, Mode=OneWay, RelativeSource={RelativeSource   FindAncestor, AncestorType={x: Type DataGridColumnHeader}}}"></ ComboBox>

                                </StackPanel>                                                                                                        

                                                                                                 <Thumb x :Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ColumnHeaderGripperStyle}"/>

                                                                                                 <Thumb x :Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Style="{StaticResource ColumnHeaderGripperStyle}"/>

                                                                                 </Grid>

                                                                 </ControlTemplate>

                                                 </Setter.Value>

                                 </Setter>

                <EventSetter Event ="Selector.SelectionChanged" Handler="ComboBox_SelectionChanged"/>

            </Style>