これを機能させる唯一の方法は、DataGridBoundColumnのように実装することです。アイデアは、バインディングプロパティにバインドすることです。このプロパティは、バインディングをプライベートDependencyPropertyに内部的に設定します。そのプロパティが変更されると、DependencyProperty変更コールバック内で必要なすべてを実行できます。
次に例を示します。
/// <summary>
/// Represents a System.Windows.Controls.DataGrid column that can bind to a property
/// in the grid's data source. This class provides bindable properties ending with the suffix Binding.
/// These properties will affect the properties with the same name without the suffix
/// </summary>
public class DataGridBindableTemplateColumn : DataGridBoundColumn
{
/// <summary>
/// Identifies the DataGridBindableTemplateColumn.HeaderValueProperty dependency property
/// </summary>
internal static readonly DependencyProperty HeaderValueProperty =
DependencyProperty.Register("HeaderValue", typeof(object), typeof(DataGridBindableTemplateColumn),
new PropertyMetadata(null, OnHeaderValuePropertyChanged));
/// <summary>
/// Identifies the DataGridBindableTemplateColumn.VisibilityValueProperty dependency property
/// </summary>
internal static readonly DependencyProperty VisibilityValueProperty =
DependencyProperty.Register("VisibilityValue", typeof(Visibility), typeof(DataGridBindableTemplateColumn),
new PropertyMetadata(Visibility.Visible, OnVisibilityPropertyPropertyChanged));
/// <summary>
/// The callback the fires when the VisibilityValueProperty value changes
/// </summary>
/// <param name="d">The DependencyObject from which the property changed</param>
/// <param name="e">The DependencyPropertyChangedEventArgs containing the old and new value for the depenendency property that changed.</param>
private static void OnVisibilityPropertyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DataGridBindableTemplateColumn sender = d as DataGridBindableTemplateColumn;
if (sender != null)
{
sender.OnVisibilityPropertyChanged((Visibility)e.OldValue, (Visibility)e.NewValue);
}
}
/// <summary>
/// The callback the fires when the HeaderValueProperty value changes
/// </summary>
/// <param name="d">The DependencyObject from which the property changed</param>
/// <param name="e">The DependencyPropertyChangedEventArgs containing the old and new value for the depenendency property that changed.</param>
private static void OnHeaderValuePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DataGridBindableTemplateColumn sender = d as DataGridBindableTemplateColumn;
if (sender != null)
{
sender.OnHeaderValueChanged((object)e.OldValue, (object)e.NewValue);
}
}
private Binding _headerBinding;
private Binding _visibilityBinding;
private DataTemplate _cellEditingTemplate;
private DataTemplate _cellTemplate;
/// <summary>
/// Gets and sets the Binding object used to bind to the Header property
/// </summary>
public Binding HeaderBinding
{
get { return _headerBinding; }
set
{
if (_headerBinding != value)
{
_headerBinding = value;
if (_headerBinding != null)
{
_headerBinding.ValidatesOnExceptions = false;
_headerBinding.NotifyOnValidationError = false;
BindingOperations.SetBinding(this, HeaderValueProperty, _headerBinding);
}
}
}
}
/// <summary>
/// Gets and sets the Binding object used to bind to the Visibility property
/// </summary>
public Binding VisibilityBinding
{
get { return _visibilityBinding; }
set
{
if (_visibilityBinding != value)
{
_visibilityBinding = value;
if (_visibilityBinding != null)
{
_visibilityBinding.ValidatesOnExceptions = false;
_visibilityBinding.NotifyOnValidationError = false;
BindingOperations.SetBinding(this, VisibilityValueProperty, _visibilityBinding);
}
}
}
}
/// <summary>
/// Gets or sets the template that is used to display the contents of a cell
/// that is in editing mode.
/// </summary>
public DataTemplate CellEditingTemplate
{
get { return _cellEditingTemplate; }
set
{
if (_cellEditingTemplate != value)
{
_cellEditingTemplate = value;
}
}
}
/// <summary>
/// Gets or sets the template that is used to display the contents of a cell
/// that is not in editing mode.
/// </summary>
public DataTemplate CellTemplate
{
get { return _cellTemplate; }
set
{
if (_cellTemplate != value)
{
_cellTemplate = value;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="editingElement"></param>
/// <param name="uneditedValue"></param>
protected override void CancelCellEdit(FrameworkElement editingElement, object uneditedValue)
{
editingElement = GenerateEditingElement(null, null);
}
/// <summary>
///
/// </summary>
/// <param name="cell"></param>
/// <param name="dataItem"></param>
/// <returns></returns>
protected override FrameworkElement GenerateEditingElement(DataGridCell cell, object dataItem)
{
if (CellEditingTemplate != null)
{
return (CellEditingTemplate.LoadContent() as FrameworkElement);
}
if (CellTemplate != null)
{
return (CellTemplate.LoadContent() as FrameworkElement);
}
if (!DesignerProperties.IsInDesignTool)
{
throw new Exception(string.Format("Missing template for type '{0}'", typeof(DataGridBindableTemplateColumn)));
}
return null;
}
/// <summary>
///
/// </summary>
/// <param name="cell"></param>
/// <param name="dataItem"></param>
/// <returns></returns>
protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
{
if (CellTemplate != null)
{
return (CellTemplate.LoadContent() as FrameworkElement);
}
if (CellEditingTemplate != null)
{
return (CellEditingTemplate.LoadContent() as FrameworkElement);
}
if (!DesignerProperties.IsInDesignTool)
{
throw new Exception(string.Format("Missing template for type '{0}'", typeof(DataGridBindableTemplateColumn)));
}
return null;
}
/// <summary>
///
/// </summary>
/// <param name="editingElement"></param>
/// <param name="editingEventArgs"></param>
/// <returns></returns>
protected override object PrepareCellForEdit(FrameworkElement editingElement, RoutedEventArgs editingEventArgs)
{
return null;
}
/// <summary>
///
/// </summary>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
protected virtual void OnHeaderValueChanged(object oldValue, object newValue)
{
Header = newValue;
}
/// <summary>
/// I'm to lazy to write a comment
/// </summary>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
protected virtual void OnVisibilityPropertyChanged(Visibility oldValue, Visibility newValue)
{
Visibility = newValue;
}
}
XAML：
<data:DataGridBindableTemplateColumn HeaderBinding="{Binding HeaderOne, Source={StaticResource ViewModel}}"
VisibilityBinding="{Binding HeaderOneVisibility, Source={StaticResource ViewMode}}"
HeaderStyle="{StaticResource DataColumnStyle}"
MinWidth="58">
...
</data:DataGridBindableTemplateColumn>
これが同じ問題を抱えている人に役立つことを願っています...お楽しみください！