从ddMM自动获取完整日期dd / mm / YYYY

Question

我们的日期格式为DD / MM / YYYY。如果用户仅输入日期和月份，则该应用应自动获取当前年份。例如：如果用户放置0104，则该应用应获取01/04/2020。需要根据日期自动获得年份

如果用户在DatePicker ddmm（ex.0401）上选择Date，则应当自动以dd / mm / yyyy格式（例如ex.04 / 01/2020）获得Date]

<DatePicker
            Grid.Column="3"
            x:Name="FinancialYear"
            HorizontalAlignment="Left" 
            Margin="74,317,0,0"
            VerticalAlignment="Top"
            SelectedDate="{Binding FinancialYear,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,StringFormat='dd/MM/yyyy',ValidatesOnDataErrors=False}"
            Uid="none" Width="151"
            PreviewKeyDown="FinancialYear_PreviewKeyDown">
</DatePicker>

Answer 1

<DatePicker x:Name="FinancialYear">
    <DatePicker.Resources>
        <Style TargetType="{x:Type DatePickerTextBox}">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBox x:Name="PART_TextBox" Text="{Binding Path=SelectedDate, StringFormat='dd MM', 
                                    RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DatePicker.Resources>
</DatePicker>