Question

我正在使用Windows Phone 8.1 DatePicker

默认情况下，该日期显示为月/日/年，我无法通过任何方式将其更改为“正确”字样。 日/月/年的方式。

这就是我声明DatePicker的方式

<DatePicker Name="datePicker" HorizontalAlignment="Center" MonthFormat="{}{month.full}"/>

将其显示为

enter image description here

我可以在链接的msdn文章中看到我可以将DateTimeFormatter与ComboBox选择器结合使用，但这对我来说不是一个选项。

有可能吗？

Answer 1

编辑模板

在Xaml中，每个控件都有一种你可以操作的风格，以改变它的外观和感觉。控件也相互继承，例如日期选择器由按钮和内容容器组成。按钮由边框和内容容器组成。

更新日期选择器样式。右键单击visual studio中的日期选择器控件，从菜单中单击编辑模板，然后单击编辑副本。对于此示例，您希望在日期选择器模板...

中编辑按钮模板的样式

您还需要创建一个在模板中使用的Converter类

这个答案对我有用带日期选择器的页面......

<Page
x:Class="DatePikerAnswer.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:DatePikerAnswer"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Page.Resources>
    <!-- Format Converter -->
    <local:DateConverter x:Key="FormatConverter"/>

    <!-- My Button Style-->
    <Thickness x:Key="PhoneBorderThickness">2.5</Thickness>
    <FontWeight x:Key="PhoneButtonFontWeight">Semibold</FontWeight>
    <x:Double x:Key="TextStyleLargeFontSize">18.14</x:Double>
    <x:Double x:Key="PhoneButtonMinHeight">57.5</x:Double>
    <x:Double x:Key="PhoneButtonMinWidth">109</x:Double>
    <Thickness x:Key="PhoneTouchTargetOverhang">0,9.5</Thickness>
    <SolidColorBrush x:Key="ButtonDisabledBackgroundThemeBrush" Color="Transparent"/>
    <Style x:Key="MyButtonStyle" TargetType="Button">
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderBrush" Value="{ThemeResource PhoneForegroundBrush}"/>
        <Setter Property="Foreground" Value="{ThemeResource PhoneForegroundBrush}"/>
        <Setter Property="BorderThickness" Value="{ThemeResource PhoneBorderThickness}"/>
        <Setter Property="FontFamily" Value="{ThemeResource PhoneFontFamilyNormal}"/>
        <Setter Property="FontWeight" Value="{ThemeResource PhoneButtonFontWeight}"/>
        <Setter Property="FontSize" Value="{ThemeResource TextStyleLargeFontSize}"/>
        <Setter Property="Padding" Value="9.5,0"/>
        <Setter Property="MinHeight" Value="{ThemeResource PhoneButtonMinHeight}"/>
        <Setter Property="MinWidth" Value="{ThemeResource PhoneButtonMinWidth}"/>
        <Setter Property="HorizontalAlignment" Value="Left"/>
        <Setter Property="VerticalAlignment" Value="Center"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Grid x:Name="Grid" Background="Transparent">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualStateGroup.Transitions>
                                    <VisualTransition From="Pressed" To="PointerOver">
                                        <Storyboard>
                                            <PointerUpThemeAnimation Storyboard.TargetName="Grid"/>
                                        </Storyboard>
                                    </VisualTransition>
                                    <VisualTransition From="PointerOver" To="Normal">
                                        <Storyboard>
                                            <PointerUpThemeAnimation Storyboard.TargetName="Grid"/>
                                        </Storyboard>
                                    </VisualTransition>
                                    <VisualTransition From="Pressed" To="Normal">
                                        <Storyboard>
                                            <PointerUpThemeAnimation Storyboard.TargetName="Grid"/>
                                        </Storyboard>
                                    </VisualTransition>
                                </VisualStateGroup.Transitions>
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="PointerOver"/>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <PointerDownThemeAnimation Storyboard.TargetName="Grid"/>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonPressedForegroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonPressedBackgroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledForegroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="Border">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledBorderThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledBackgroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{ThemeResource PhoneTouchTargetOverhang}">
                            <ContentPresenter x:Name="ContentPresenter"
                                              AutomationProperties.AccessibilityView="Raw" 
                                              ContentTemplate="{TemplateBinding ContentTemplate}" 
                                              Content="{Binding Content,  RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource FormatConverter},ConverterParameter=\{0:dd/MM/yyyy\}}" 
                                              Foreground="{TemplateBinding Foreground}" 
                                              HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                              Margin="{TemplateBinding Padding}" 
                                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!--DatePicker Style-->
    <FontFamily x:Key="PhoneFontFamilyNormal">Segoe WP</FontFamily>
    <x:Double x:Key="ContentControlFontSize">20.26</x:Double>
    <Style x:Key="MyDatePickerStyle1" TargetType="DatePicker">
        <Setter Property="FontFamily" Value="{ThemeResource PhoneFontFamilyNormal}"/>
        <Setter Property="FontSize" Value="{ThemeResource ContentControlFontSize}"/>
        <Setter Property="Foreground" Value="{ThemeResource DatePickerForegroundThemeBrush}"/>
        <Setter Property="HorizontalAlignment" Value="Stretch"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="DatePicker">
                    <StackPanel x:Name="LayoutRoot" Margin="{TemplateBinding Padding}">
                        <ContentPresenter x:Name="HeaderContentPresenter"
                                          ContentTemplate="{TemplateBinding HeaderTemplate}"
                                          Content="{TemplateBinding Header}" Margin="0,0,0,-3" 
                                          Style="{StaticResource HeaderContentPresenterStyle}"/>
                        <Button x:Name="FlyoutButton" 
                                BorderBrush="{TemplateBinding Foreground}" 
                                BorderThickness="2.5" 
                                Background="{TemplateBinding Background}" 
                                Foreground="{TemplateBinding Foreground}" 
                                HorizontalAlignment="Stretch" 
                                HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                IsEnabled="{TemplateBinding IsEnabled}"
                                Style="{StaticResource MyButtonStyle}"
                                Padding="6.5,0,0,3"/>
                    </StackPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Page.Resources>

 <Grid>

  </Grid>
</Page>

转换器类......

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.UI.Xaml.Data;

namespace DatePikerAnswer
{
  class DateConverter : IValueConverter
  {
    public object Convert(object value, Type targetType, object parameter, string language)
    {
       if (value != null)
        {
            ///Convert Class throws exception so can not convert to date time
            string TheCurrentDate = value.ToString();

            string[] Values = TheCurrentDate.Split('/');
            string Day, Month, Year;

            Day = Values[1];
            Month = Values[0];
            Year = Values[2];

            string retvalue = string.Format("{0}/{1}/{2}", Day, Month, Year);
            return retvalue;
       }
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        throw new NotImplementedException();
    }
  }
}

最终结果是......

enter image description here

Answer 2

我需要将日期显示为“月份年”，我尝试了一些我想过的解决方案，但他们没有工作，搜索了一下，最后发现了这个问题和StuartSmith的答案。基于他的回答，我提出了类似的解决方案，解决了Kubaskista评论中提到的本地化问题

@StuartSmith由于数据格式不同，它不适用于德语本地化以及其他一些地区。顺便说一句：任何想法为什么＆＃34;价值＆＃34;在转换器中无法转换为DateTime？

1-在xaml中定义日期选择器，给它命名＆＃34; FirstDatePicker＆＃34;然后从Designer编辑模板中选择编辑副本。

Date Picker Style

<DatePicker x:Name="FirstDatePicker" VerticalAlignment="Top" Grid.Row="1" Margin="0,12,0,0"    CalendarIdentifier="GregorianCalendar" DayVisible="False" Padding="0" Style="{StaticResource DatePickerStyle}" RequestedTheme="Light"/>

2-右键单击FlyoutButton - ＆gt;其他模板 - ＆gt;编辑生成的内容 - ＆gt;编辑副本。

enter image description here

3-内部内容模板，我们将直接绑定到FirstDatePicker的Date属性，并使用StringFormatConverter，您可以根据需要格式化日期并覆盖文化。

<DataTemplate x:Key="DateFormatTemplate">
        <Grid>
            <TextBlock x:Name="textBlock" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding Date, ConverterParameter=MMMM yyyy, Converter={StaticResource DateFormatConverter}, ElementName=FirstDatePicker, Mode=OneWay}" VerticalAlignment="Top"/>
        </Grid>
    </DataTemplate>

4-将StringFormatConverter添加到解决方案中，不要忘记将其添加到页面的资源部分。

  public class DateFormatConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert ( object value, Type targetType, object parameter, string language )
    {
        if(!(value is DateTime || value is DateTimeOffset) || parameter == null) return value;
        if(value is DateTime)
        {
            var date = (DateTime)value;
            return date.ToString(parameter.ToString(), CultureInfo.CurrentCulture);
        }
        else
        {
            var date = (DateTimeOffset)value;
            return date.ToString(parameter.ToString(), CultureInfo.CurrentCulture);
        }
    }

    public object ConvertBack ( object value, Type targetType, object parameter, string language )
    {
        throw new NotImplementedException();
    }

    #endregion
}

注意：您可以更改＆＃39; CultureInfo.CurrentCulture＆＃39;以新文化（＆＃34; ar-EG＆＃34;）为例，或使用转换器中传递的语言。

最后，这是我在页面

的资源部分所拥有的内容

 <converters:DateFormatConverter x:Key="DateFormatConverter"/>
 <x:Double x:Key="ContentControlFontSize">20.26</x:Double>
    <FontWeight x:Key="PhoneButtonFontWeight2">Semibold</FontWeight>
    <DataTemplate x:Key="DateFormatTemplate">
        <Grid>
            <TextBlock x:Name="textBlock" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding Date, ConverterParameter=MMMM yyyy, Converter={StaticResource DateFormatConverter}, ElementName=FirstDatePicker, Mode=OneWay}" VerticalAlignment="Top"/>
        </Grid>
    </DataTemplate>
    <Style x:Key="DatePickerStyle" TargetType="DatePicker">
        <Setter Property="FontFamily" Value="{ThemeResource PhoneFontFamilyNormal}"/>
        <Setter Property="FontSize" Value="{ThemeResource ContentControlFontSize}"/>
        <Setter Property="Foreground" Value="{ThemeResource DatePickerForegroundThemeBrush}"/>
        <Setter Property="HorizontalAlignment" Value="Stretch"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="DatePicker">
                    <StackPanel x:Name="LayoutRoot" Margin="{TemplateBinding Padding}">
                        <ContentPresenter x:Name="HeaderContentPresenter" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" Margin="0,0,0,-3" Style="{StaticResource HeaderContentPresenterStyle}"/>
                        <Button x:Name="FlyoutButton" BorderBrush="{TemplateBinding Foreground}" BorderThickness="2.5" Background="{TemplateBinding Background}" Foreground="{TemplateBinding Foreground}" HorizontalAlignment="Stretch" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsEnabled="{TemplateBinding IsEnabled}" Padding="12,10" Margin="0"   ContentTemplate="{StaticResource DateFormatTemplate}"/>
                    </StackPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

如何格式化DatePicker以显示日/月/年的日期格式？

2 个答案: