/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// daterangeeventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this DateRangeEventHandler daterangeeventhandler, Object sender, DateRangeEventArgs e, AsyncCallback callback)
{
if (daterangeeventhandler == null)
{
throw new ArgumentNullException("daterangeeventhandler");
}
return(daterangeeventhandler.BeginInvoke(sender, e, callback, null));
}
/// <summary>
/// テキスト変更時にメッセージボックスを表示する
/// </summary>
/// <param name="textbox">ボタン</param>
static void ChangeDateTimeEvent(MonthCalendar monthcalendar)
{
DateRangeEventHandler handler = null;
handler = delegate
{
MessageBox.Show("");
monthcalendar.BeginInvoke((MethodInvoker) delegate
{
monthcalendar.DateChanged -= handler;
});
};
monthcalendar.DateChanged += handler;
}