CODEWITHSUNDEEP
wpfvisual-studio-2013datagriddatepickerevent-handling
Bhoboco
Bhoboco

Reputation: 13

What is the correct DatePicker SelectedDateChangedEvent Handler type for a FrameworkElementFactory

I am creating a column of bound DatePicker controls in a DataGrid control. For each of the DatePicker controls I would like to attach a SelectedDateChangedEvent handler, but I am having difficulty doing this.

Consider the following code for WPF:

private void dg_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.PropertyName == "Event Date")
    {
        var f = new FrameworkElementFactory(typeof(DatePicker));

         ...

        // I tried this:
        //f.AddHandler(DatePicker.SelectedDateChangedEvent, new RoutedEventHandler(aRoutedEventHandler));
        // and I tried this:
        //f.AddHandler(DatePicker.SelectedDateChangedEvent, new SelectionChangedEventHandler(aSelectionChangedEventHandler));

        e.Column = new DataGridTemplateColumn()
        {
            Header = e.Column.Header,
            CellTemplate = new DataTemplate() { VisualTree = f },
        };
    }
}

private void aRoutedEventHandler(object sender, RoutedEventArgs e)   { ... }

private void aSelectionChangedEventHandler(object sender, SelectionChangedEventArgs e) {...}

Trying either of the event handlers result in an "Argument Exception":

A first chance exception of type 'System.ArgumentException' occurred in PresentationFramework.dll Additional information: Handler type is not valid.

What is the correct handler to use?

Upvotes: 0

Views: 534

Answers (1)

Justin
Justin

Reputation: 63

You need to add the handler as follows for the DatePicker SelectedDateChangedEvent

f.AddHandler(DatePicker.SelectedDateChangedEvent, new EventHandler<SelectionChangedEventArgs>(aSelectionChangedEventHandler));

The handler type can be found by looking into the DatePicker class at the public events declared

public event RoutedEventHandler CalendarOpened;
public event RoutedEventHandler CalendarOpened;
public event EventHandler<DatePickerDateValidationErrorEventArgs> 
public event EventHandler<SelectionChangedEventArgs> SelectedDateChanged;

Upvotes: 1

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