Question

我正在尝试在uwp app中使用CalendarDatePicker控件。我试图将日期限制为MinDate＆amp; maxDate。我可以在c＃中设置如下

Calendercontrol.MinDate=DateTime.Now();
Calendercontrol.MaxDate=DateTime.Now.AddYears(3);

是否可以告诉我如何在Xaml中设置min和max值。

Answer 1

创建一个继承自CalendarDatePicker的类，添加自定义最小/最大依赖项。

public class CustomCalendarDatePicker : CalendarDatePicker
{
    public DateTimeOffset Max
    {
        get { return (DateTimeOffset)GetValue(MaxProperty); }
        set { SetValue(MaxProperty, value); }
    }

    public static readonly DependencyProperty MaxProperty =
        DependencyProperty.Register(
            nameof(Max),                     // The name of the DependencyProperty
            typeof(DateTimeOffset),                   // The type of the DependencyProperty
            typeof(CustomCalendarDatePicker), // The type of the owner of the DependencyProperty
            new PropertyMetadata(           
                  null, onMaxChanged                    // The default value of the DependencyProperty
            ));

    private static void onMaxChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var calendar = d as CustomCalendarDatePicker;
        calendar.MaxDate = (DateTimeOffset)e.NewValue;
    }

    public DateTimeOffset Min
    {
        get { return (DateTimeOffset)GetValue(MinProperty); }
        set { SetValue(MinProperty, value); }
    }

    public static readonly DependencyProperty MinProperty =
        DependencyProperty.Register(
            nameof(Min),                     // The name of the DependencyProperty
            typeof(DateTimeOffset),                   // The type of the DependencyProperty
            typeof(CustomCalendarDatePicker), // The type of the owner of the DependencyProperty
            new PropertyMetadata(           
                null, onMinChanged                      // The default value of the DependencyProperty
            ));

    private static void onMinChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var calendar = d as CustomCalendarDatePicker;
        calendar.MinDate = (DateTimeOffset)e.NewValue;
    }
}

用法：

<controls:CustomCalendarDatePicker Min="" Max=""/>

UWP：如何在xaml中为CalendarDatePicker控件设置Mindate和MaxDate

1 个答案: