CODEWITHSUNDEEP
c#wpfdata-binding
svinja
svinja

Reputation: 5576

WPF CheckBox.IsChecked binding

I have a datagrid with a variable number of columns that I am generating programatically. It contains DataGridTemplateColumns, each with a DockPanel containing a CheckBox and a TextBlock.

Binding code:

    Binding bindingPicked = new Binding(string.Format("Prices[{0}].Picked", i));
    bindingPicked.Mode = BindingMode.TwoWay;

CheckBox code:

    FrameworkElementFactory factoryCheckBox = new FrameworkElementFactory(typeof(CheckBox));
    factoryCheckBox.SetValue(CheckBox.IsCheckedProperty, bindingPicked);

Picked property:

    private bool _picked;
    public bool Picked
    {
        get { return _picked; }
        set { _picked = value; }
    }

When the datagrid is initialized, the Picked getters are called as expected. However, when I check/uncheck a checkbox, the setter isn't called. What is causing this? I do not want to use a DependencyProperty, and I don't think it should be needed as I just need the property setter to be called when the user clicks the CheckBox.

EDIT: Apparently I am a moron, I simply forgot bindingPicked.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; Feel free to close this.

Upvotes: 2

Views: 3688

Answers (3)

Steven Licht
Steven Licht

Reputation: 770

As above, you need to implement INotifyPropertyChanged The correct pattern to follow is:

private bool _picked;
public bool Picked
{
    get { return _picked; }
    set
    {
        if (_picked != value)
        {
            _picked = value;
            if (null != PropertyChanged)
            {
                PropertyChanged(this, new PropertyChangedEventArgs("Picked"));
            }
        }
    }
}

The UpdateSourceTrigger property tells databinding when to update the source. For example, with a TextBox, the default is LostFocus. For most other controls it is PropertyChanged.

Upvotes: 0

Jeetendra.Sharma
Jeetendra.Sharma

Reputation: 194

I Think you should Implement INotifyPropertyChanged's and call the event in set

Upvotes: 1

Bas
Bas

Reputation: 27115

bindingPicked.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

That should do it :)

Upvotes: 5

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