Specifics of the ModelProperty.SetValue method from Microsoft.Windows.Design.Interaction.dll

Are there any peculiarities of the method SetValue from Microsoft.Windows.Design.Model.ModelProperty class (Assembly Microsoft.Windows.Design.Interaction.dll)

When I assign a value using this method, it appears in the XAML file but is not assigned to the actual property.

private void TestMenuAction_Execute(object sender, MenuActionEventArgs e)  
{  
  ModelItem selectedDataGrid = e.Selection.PrimarySelection;  
  ModelItem colModelItem = selectedDataGrid.Properties["StaticColumns"].Collection[0];  
  
  using (ModelEditingScope scope = selectedDataGrid.BeginEdit("Set Column Width"))  
  {  
    colModelItem.Properties["Width"].SetValue(99);  
    scope.Complete();  
    //scope.Update();  
  }  
}

The value is transferred to the property only after I click any key in the XAML editor. For example Space.

DaisyTian-1203 11,621 Reputation points

2021-06-30T09:11:59.927+00:00

@Дмитрий Большаков
Could you give me some info of eb and DataGridTemplatedColumnTemplate? Did you want to set Width="99" in the xaml as the same affect as colModelItem.Properties["Width"].SetValue(99);?
Дмитрий Большаков 1 Reputation point

2021-06-30T19:47:18.83+00:00
Do you think the problem is not in the design-time code, but in the Width property?

Width is classic DependencyProperty of DataGridLength type.

public class DataGridTemplateColumn : DataGridColumn { ... }

Дмитрий Большаков 1

  public class DataGridColumn : PropertyAxisBar, IMultiTitleTreeItemDef, IMultiTitleNodeProvider
  {

    public static readonly DependencyProperty WidthProperty =
        DependencyProperty.Register(
            "Width",
            typeof(DataGridLength),
            typeof(DataGridColumn),
            new FrameworkPropertyMetadata(DataGridLength.Auto, 
                                          new PropertyChangedCallback(OnWidthPropertyChanged), 
                                          new CoerceValueCallback(OnCoerceWidth)));

    public DataGridLength Width
    {
      get { return (DataGridLength)GetValue(WidthProperty); }
      set { SetValue(WidthProperty, value); }
    }

Дмитрий Большаков 1

    private static void OnWidthPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      d.CoerceValue(ActualWidthProperty);

      DataGridColumn column = (DataGridColumn)d;
      if (column.GridOwner != null)
        column.GridOwner.ColumnWidthsChanged(column);
    }
....
  }

DaisyTian-1203 11,621 Reputation points

2021-07-01T05:04:05.87+00:00

@Дмитрий Большаков
I mean I am little consfused by your question description. I asked you questions to make sure I understand your tread correctly. Could you describe your I assign a value using this method ? Does it refer to the DependencyProperty Width which you create in DataGridColumn? And what does value is transferred to the property mean?
Дмитрий Большаков 1 Reputation point

2021-07-01T05:20:07.287+00:00

Yes.
There is a class - DataGridColumn, with Dependency property Width.
I can assign this property using code Column.Width = 99.
And it works at run-time.
A also have design-time part of the library where try to assign same property using code:
colModelItem.Properties["Width"].SetValue(99)
and this code works in a very strange way.
As specifically, strange, I described in the main post.
Дмитрий Большаков 1 Reputation point

2021-07-01T05:25:20.367+00:00

It looks like the designer cannot assign a value of type int to the property of type DataGridLength.
However, it does not throw any exceptions.
DataGridLength has [TypeConverter(typeof(DataGridLengthConverter))] that support such a conversions.

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Specifics of the ModelProperty.SetValue method from Microsoft.Windows.Design.Interaction.dll