How to create label and dynamically add binding to its content property in WPF

Question

I'm trying to create a label at runtime and connect it's Content property to another TextBox control which is in my UserControl called MyLabelSettings.

This is what I got so far:

Label currCtrl = new Label();
MyLabelSettings currCtrlProperties = new MyLabelSettings();

// Bindings to properties
Binding binding = new Binding();
binding.Source = currCtrlProperties.textBox_Text.Text;
binding.Path = new PropertyPath(Label.VisibilityProperty);
BindingOperations.SetBinding(currCtrl.Content, Label.ContentProperty, binding);

The last row shows an error which I did not figure out how to solve:

The best overloaded method match for 'System.Windows.Data.BindingOperations. SetBinding(System.Windows.DependencyObject, System.Windows.DependencyProperty, System.Windows.Data.BindingBase)' has some invalid arguments

I have in MyLabelSettings the implementation of INotifyPropertyChanged which has the following code when the TexBox.Text changes

private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
    InvokePropertyChanged(new PropertyChangedEventArgs("TextChanged"));
}

Is there a better way to bind these 2? Or am I doing something wrong in this one?

Thanks!

user1618054 · Accepted Answer · 2016-04-11 18:42:46Z

The problem is simpler than you realize:

This:

binding.Source = currCtrlProperties.textBox_Text.Text;
binding.Path = new PropertyPath(Label.VisibilityProperty);
BindingOperations.SetBinding(currCtrl.Content, Label.ContentProperty, binding);

Should be this:

//The source must be an object, NOT a property
binding.Source = currCtrlProperties;
//Since the binding source is not a DependencyObject, we using string to find it's property
binding.Path = new PropertyPath("TextToBind");
BindingOperations.SetBinding(currCtrl, Label.ContentProperty, binding);

Before, you were attempting to bind the value to an object's property via a property. Now, you're binding the value to an object's property via an object (:

Notes:

You are attempting to bind the text of a control that exists in an instance of a class you just made.
```
MyLabelSettings currCtrlProperties = new MyLabelSettings();
```
I base this assumption off this line:
```
currCtrlProperties.textBox_Text.Text;
```
Which appears to contain a text control of some sort. Rather, you want bind the text of a property that exists in an instance of a class you make, not a control.

Collectives™ on Stack Overflow

How to create label and dynamically add binding to its content property in WPF

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related