WPF 自定義事件處理程序

Question

我已經實現了 DatePicker https://github.com/cmyksvoll/HighlightDatePicker的代碼，但是我不能在 WPF 中使用 SelectedDateChanged 並出現錯誤ArgumentException: Cannot bind to the target method because its signature or security transparency is not compatible with that of the delegate type

我嘗試為“SelectedDateChanged”創建自定義偶數處理程序，但 HighlightDatePicker class 是 static，我無法注冊它，以便在 MainWindow 中調用我的方法

WPF：

<hdp:HighlightDatePicker SelectedDate="{Binding SelectedDate}"  HighlightedDates="{Binding HighlightedDates}" HighlightBrush="LawnGreen" SelectedDateChanged="ProviderDateChanged"/>

我要調用的 MainWindow 方法：

        public void ProviderDateChanged(object Sender, RoutedEventArgs e)
        { // fetch data to display }

突出顯示日期選擇器 Class：

    public class HighlightDatePicker : DatePicker
{
     static HighlightDatePicker()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(HighlightDatePicker), new FrameworkPropertyMetadata(typeof(HighlightDatePicker)));


    public static readonly DependencyProperty HighlightedDatesProperty = DependencyProperty.Register("HighlightedDates", typeof(IList<HighlightedDate>), typeof(HighlightDatePicker));



    public IList<HighlightedDate> HighlightedDates
    {
        get { return (IList<HighlightedDate>)GetValue(HighlightedDatesProperty); }
        set { SetValue(HighlightedDatesProperty, value); }
    }

    public static readonly DependencyProperty HighlightBrushProperty = DependencyProperty.Register("HighlightBrush", typeof(Brush),
        typeof(HighlightDatePicker), new PropertyMetadata(Brushes.Orange));

    public Brush HighlightBrush
    {
        get { return (Brush)GetValue(HighlightBrushProperty); }
        set { SetValue(HighlightBrushProperty, value); }
    }
}
public class HighlightedDate
{
    public HighlightedDate(DateTime date, string description)
    {
        Date = date;
        Description = description;
    }

    public DateTime Date { get; set; }
    public string Description { get; set; }
}

Answer 1

SelectedDateChanged 事件的處理程序方法的正確簽名是：

    private void ProviderDateChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
    {
        // fetch data to display
    }