WPF CheckBox.IsChecked binding

Question

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.

Answer 1

bindingPicked.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

那应该做的:)

Answer 2

我认为您应该实现INotifyPropertyChanged并在set中调用该事件

Answer 3

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.