wpf - WPF 中的 Windows 窗体控件包装无法正常工作

Question

我需要包装 Windows 窗体DateTimePicker以在我的 WPF 3.5 应用程序中使用它。我已经控制了它：

<UserControl><WindowsFormsHost>
<wf:DateTimePicker x:Name="picker" ValueChanged="DateTimePicker_ValueChanged"/>
</WindowsFormsHost></UserControl>

这是支持代码：

    bool suppressUpdates;

    public DatePicker()
    {
        InitializeComponent();
    }

    private void DateTimePicker_ValueChanged(object sender, EventArgs e)
    {
        if(!suppressUpdates)
            SetValue(SelectedDateProperty, picker.Value);
    }

    public DateTime SelectedDate
    {
        get {return (DateTime)GetValue(SelectedDateProperty); }
        set
        {
            suppressUpdates = true;
            picker.Value = value;
            SetValue(SelectedDateProperty, value);
            suppressUpdates = false;
        }
    }

    public static readonly DependencyProperty SelectedDateProperty =
    DependencyProperty.Register("SelectedDate", typeof(DateTime),
   typeof(DatePicker), new UIPropertyMetadata(DateTime.Now));

然后我在 WPF 窗口中使用它：

<mui:DatePicker Width="300" SelectedDate="{Binding
Path=TheDate, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

它绑定到INotifyPropertyChanged启用的视图模型。所有其他控件都很好地绑定到它，但我的 DateTimePicker 没有获得视图模型中指定的日期值。但是，它将其值更改传播回给它。

我究竟做错了什么？

Answer 1

好的，这很简单。

    private void DateTimePicker_ValueChanged(object sender, EventArgs e)
    {
        SetValue(SelectedDateProperty, picker.Value);
    }

    public DateTime SelectedDate
    {
        get { return (DateTime)GetValue(SelectedDateProperty); }
        set { SetValue(SelectedDateProperty, value); }
    }

    public static readonly DependencyProperty SelectedDateProperty =
        DependencyProperty.Register("SelectedDate", typeof(DateTime), typeof(DatePicker), new UIPropertyMetadata(DateTime.Now, textChangedCallback));

    private static void textChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        DatePicker input = (DatePicker)d;
        input.picker.Value = (DateTime)e.NewValue;
    }