DataGridColum的bug

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 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>
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原文地址：https://www.cnblogs.com/muzizongheng/p/3169424.html