Element Binding if both involved objects are created in code behind

Question

in my WPF project, I try to create the displayed objects in Code behind. For some properties I use Element Binding, f.e.:

<GridViewColumn ... Width="{Binding ElementName=dummywidth1, Path=ActualWidth}" >

To do this in code behind, I use the following code:

GridViewColumn column = new GridViewColumn();
Binding binding = new Binding("ActualWidth");
binding.ElementName = "dummywidth1";
BindingOperations.SetBinding(column, GridViewColumn.WidthProperty, binding);

where "dummywidth1" is a Border with the width to use.

This works well, if the Border "dummywidth1" is already part of the .xaml file. If I create the Border in code behind as well, the width is NOT applied to the column.

Border border = new Border();
border.Name = "WidthHelper" + Grid_Sizer.ColumnDefinitions.Count;
Grid_Sizer.Children.Add(border);

and use the new border.Name for the binding.

binding.ElementName = border.Name;

It seems, that the Element Binding does not work with the just created Border object. When the WPF is displayed, the borders created in code behind have the desired size, but that size is not transfered to the column. Is there any way to achieve the element binding with both elements created in Code behind?

Thanks in advance,
Frank

Haven't done WPF in a while but I seem to remember something about dynamic element names not being recognized immediately within the visual tree without some sort of intermediary step. — Alex Paven, Jun 23 '17 at 12:14
@AlexPaven You probably mean namescopes, but that is not at all necessary. — Clemens, Jun 23 '17 at 12:24

score 3 · Accepted Answer · answered Jun 23 '17 at 11:40

3

It would be much simpler to set the Binding's Source property instead of ElementName:

binding.Source = border;

answered Jun 23 '17 at 11:40

Clemens

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Here you go, that easy :D Thank you very much! – Aaginor Jun 23 '17 at 13:07

Element Binding if both involved objects are created in code behind

1 Answers1