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>