代码隐藏中的数据绑定拒绝工作

Question

I'm trying to set a data binding in code-behind but it doesn't want to work.

When I do it in XAML like this:

<Label x:Name="lblSelectedItem" Margin="0,0,5,5" DockPanel.Dock="Left" Content="{Binding (Canvas.Left),ElementName=Ming}"></Label>

It works perfectly, but when I do it like this:

var X1Binding = new Binding("Canvas.Left") { ElementName="Ming"};
BindingOperations.SetBinding(lblSelectedItem, ContentProperty, X1Binding);

It doesn't get any value.

How do I do this properly?

Answer 1

Use parenthesis around Canvas.Left like this :

var X1Binding = new Binding("(Canvas.Left)") { ElementName = "Rect" };
BindingOperations.SetBinding(Lbl1, Label.ContentProperty, X1Binding);

Answer 2

You have to specify several Binding property values.

var X1Binding = new Binding("Canvas.Left") { ElementName="Ming"};
//X1Binding.Source = ViewModel; // Well the canvas is not on the view model so default value is the datacontext of the view.
X1Binding.Mode = BindingMode.TwoWay;
X1Binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(lblSelectedItem, ContentProperty, X1Binding);

Answer 3

Try setting binding and propertypath like below:

Binding binding = new Binding();
binding.ElementName = "Ming";
binding.Path = new PropertyPath(Canvas.LeftProperty);
lblSelectedItem.SetBinding(ContentControl.ContentProperty, binding);