【发布时间】：2012-12-09 18:12:55
【问题描述】：
我有一个 WPF C# 应用程序 (.NET 4.0) 和一个日期选择器。我想知道是否可以将格式日期（日期选择器的文本属性）更改为yyyy/MM/dd 格式。
我正在使用 MVVM 模式，所以我想知道 XAML 代码，如果可以在这个地方做的话。
【问题讨论】：
标签： c# wpf xaml mvvm datepicker
【发布时间】：2012-12-09 18:12:55
【问题描述】：
我可以使用这个代码：
<DatePicker SelectedDate="{Binding myVideModelProperty}"
Height="25" HorizontalAlignment="Left" Margin="81,-2,0,0" Name="myDatePicker" VerticalAlignment="Top" Width="115">
<DatePicker.Resources>
<Style TargetType="{x:Type DatePickerTextBox}">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<TextBox x:Name="PART_TextBox"
Text="{Binding Path=SelectedDate, RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}, StringFormat={}{0:yyyy/MM/dd}}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DatePicker.Resources>
</DatePicker>
使用 datePicker 资源，我可以设置其文本框的格式。这样，就不需要转换器，也不需要通用模板和任何其他额外的代码。
【讨论】：
根据这个post，您可以更改文化以获得正确的日期格式
System.Globalization.CultureInfo culInfo = new System.Globalization.CultureInfo("en-us");
System.Globalization.DateTimeFormatInfo dtinfo = new System.Globalization.DateTimeFormatInfo();
dtinfo.ShortDatePattern = "yyyy/MM/dd";
【讨论】：
-
但这是在 axml 中？我想使用 MVVM 模式。谢谢。
-
这没有放在 xaml 中，请您在示例中插入 som 代码，以便我更清楚地理解问题。
-
@Daimroc MVVM 并不意味着“在 XAML 中做所有事情”。
-
@svick：但我认为它会在 axml 中进行演示。如果我有一个多语言应用程序，我只想更改日期的格式，我认为这是 axml 的责任。
-
Xaml 中无法指定格式。所以你的选择是：调整文化设置，或者重建控件以支持日期格式。 MS 没有考虑到所有事情，如果我们必须等到他们发布任何东西之前发生这种情况，我们现在可能已经很幸运拥有了 .Net 1.0 测试版。 :)
将此用于您的日期选择器的Template，并使用此值转换器。在模板中，带有DatePickerTextBox 的行已被修改为使用您请求的yyyy/MM/dd 格式（通过转换器）。我修改的模板来自here。
示例用法：
<DatePicker Template="{StaticResource SpecialDatePicker}" SelectedDate="{Binding Path=Date}" />
值转换器代码：
public class DateFixerConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return DateTime.Parse((string)value).ToString("yyyy/MM/dd");
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return DateTime.Parse((string) value);
}
}
模板代码：
<ControlTemplate x:Key="SpecialDatePicker" TargetType="DatePicker">
<Border BorderThickness="{TemplateBinding Border.BorderThickness}" Padding="{TemplateBinding Control.Padding}" BorderBrush="{TemplateBinding Border.BorderBrush}" Background="{TemplateBinding Panel.Background}">
<Grid Name="PART_Root" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.Resources>
<SolidColorBrush x:Key="DisabledBrush">#A5FFFFFF</SolidColorBrush>
<ControlTemplate TargetType="Button" x:Key="DropDownButtonTemplate">
<Grid>
<Grid Background="#11FFFFFF" Width="19" Height="18" FlowDirection="LeftToRight" Margin="0,0,0,0" HorizontalAlignment="Center" VerticalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="23*" />
<RowDefinition Height="19*" />
<RowDefinition Height="19*" />
<RowDefinition Height="19*" />
</Grid.RowDefinitions>
<Border BorderThickness="1,1,1,1" CornerRadius="0,0,1,1" BorderBrush="#FF45D6FA" Name="Highlight" Margin="-1,-1,-1,-1" Opacity="0" Grid.Row="0" Grid.ColumnSpan="4" Grid.RowSpan="4" />
<Border BorderThickness="1,1,1,1" CornerRadius="0.5,0.5,0.5,0.5" BorderBrush="#FFFFFFFF" Background="#FF1F3B53" Name="Background" Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.ColumnSpan="4" Grid.RowSpan="3" />
<Border BorderThickness="1,1,1,1" CornerRadius="0.5,0.5,0.5,0.5" BorderBrush="#BF000000" Name="BackgroundGradient" Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.ColumnSpan="4" Grid.RowSpan="3">
<Border.Background>
<LinearGradientBrush StartPoint="0.7,0" EndPoint="0.7,1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FFFFFFFF" Offset="0" />
<GradientStop Color="#F9FFFFFF" Offset="0.375" />
<GradientStop Color="#E5FFFFFF" Offset="0.625" />
<GradientStop Color="#C6FFFFFF" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Border.Background>
</Border>
<Rectangle StrokeThickness="1" Grid.ColumnSpan="4" Grid.RowSpan="1">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0.46,1.6" EndPoint="0.3,-1.1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FF4084BD" />
<GradientStop Color="#FFAFCFEA" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Rectangle.Fill>
<Rectangle.Stroke>
<LinearGradientBrush StartPoint="0.48,1.25" EndPoint="0.48,-1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FF494949" />
<GradientStop Color="#FF9F9F9F" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Rectangle.Stroke>
</Rectangle>
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<Ellipse Fill="#FFFFFFFF" StrokeThickness="0" Width="3" Height="3" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.ColumnSpan="4" />
<Border BorderThickness="1,1,1,1" CornerRadius="0,0,0.5,0.5" BorderBrush="#B2FFFFFF" Name="DisabledVisual" Opacity="0" Grid.Row="0" Grid.ColumnSpan="4" Grid.RowSpan="4" />
</Grid>
</Grid>
</ControlTemplate>
</Grid.Resources>
<Button Foreground="{TemplateBinding TextElement.Foreground}" Name="PART_Button" Width="20" Margin="3,0,3,0" HorizontalAlignment="Left" VerticalAlignment="Top" Focusable="False" Grid.Column="1" Grid.Row="0">
<Button.Template>
<ControlTemplate TargetType="Button">
<Grid>
<Grid Background="#11FFFFFF" Width="19" Height="18" FlowDirection="LeftToRight" Margin="0,0,0,0" HorizontalAlignment="Center" VerticalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="23*" />
<RowDefinition Height="19*" />
<RowDefinition Height="19*" />
<RowDefinition Height="19*" />
</Grid.RowDefinitions>
<Border BorderThickness="1,1,1,1" CornerRadius="0,0,1,1" BorderBrush="#FF45D6FA" Name="Highlight" Margin="-1,-1,-1,-1" Opacity="0" Grid.Row="0" Grid.ColumnSpan="4" Grid.RowSpan="4" />
<Border BorderThickness="1,1,1,1" CornerRadius="0.5,0.5,0.5,0.5" BorderBrush="#FFFFFFFF" Background="#FF1F3B53" Name="Background" Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.ColumnSpan="4" Grid.RowSpan="3" />
<Border BorderThickness="1,1,1,1" CornerRadius="0.5,0.5,0.5,0.5" BorderBrush="#BF000000" Name="BackgroundGradient" Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.ColumnSpan="4" Grid.RowSpan="3">
<Border.Background>
<LinearGradientBrush StartPoint="0.7,0" EndPoint="0.7,1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FFFFFFFF" Offset="0" />
<GradientStop Color="#F9FFFFFF" Offset="0.375" />
<GradientStop Color="#E5FFFFFF" Offset="0.625" />
<GradientStop Color="#C6FFFFFF" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Border.Background>
</Border>
<Rectangle StrokeThickness="1" Grid.ColumnSpan="4" Grid.RowSpan="1">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0.46,1.6" EndPoint="0.3,-1.1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FF4084BD" />
<GradientStop Color="#FFAFCFEA" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Rectangle.Fill>
<Rectangle.Stroke>
<LinearGradientBrush StartPoint="0.48,1.25" EndPoint="0.48,-1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FF494949" />
<GradientStop Color="#FF9F9F9F" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Rectangle.Stroke>
</Rectangle>
<Path Data="M11.426758,8.4305077L11.749023,8.4305077 11.749023,16.331387 10.674805,16.331387 10.674805,10.299648 9.0742188,11.298672 9.0742188,10.294277C9.4788408,10.090176 9.9094238,9.8090878 10.365967,9.4510155 10.82251,9.0929432 11.176106,8.7527733 11.426758,8.4305077z M14.65086,8.4305077L18.566387,8.4305077 18.566387,9.3435936 15.671368,9.3435936 15.671368,11.255703C15.936341,11.058764 16.27293,10.960293 16.681133,10.960293 17.411602,10.960293 17.969301,11.178717 18.354229,11.615566 18.739157,12.052416 18.931622,12.673672 18.931622,13.479336 18.931622,15.452317 18.052553,16.438808 16.294415,16.438808 15.560365,16.438808 14.951641,16.234707 14.468243,15.826504L14.881817,14.929531C15.368796,15.326992 15.837872,15.525723 16.289043,15.525723 17.298809,15.525723 17.803692,14.895514 17.803692,13.635098 17.803692,12.460618 17.305971,11.873379 16.310528,11.873379 15.83071,11.873379 15.399232,12.079271 15.016094,12.491055L14.65086,12.238613z" Stretch="Fill" Fill="#FF2F2F2F" Margin="4,3,4,3" HorizontalAlignment="Center" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5" Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="4" Grid.RowSpan="3" />
<Ellipse Fill="#FFFFFFFF" StrokeThickness="0" Width="3" Height="3" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.ColumnSpan="4" />
<Border BorderThickness="1,1,1,1" CornerRadius="0,0,0.5,0.5" BorderBrush="#B2FFFFFF" Name="DisabledVisual" Opacity="0" Grid.Row="0" Grid.ColumnSpan="4" Grid.RowSpan="4" />
</Grid>
</Grid>
</ControlTemplate>
</Button.Template>
</Button>
<!-- THIS LINE :: Notice the binding for Text -->
<DatePickerTextBox Text="{Binding RelativeSource={RelativeSource AncestorType=DatePicker},Path=Text,Converter={StaticResource DateFixer}}" Foreground="{TemplateBinding TextElement.Foreground}" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Name="PART_TextBox" Grid.Column="0" Grid.Row="0" xml:space="preserve"></DatePickerTextBox>
<Grid Name="PART_DisabledVisual" Opacity="0" IsHitTestVisible="False" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Rectangle RadiusX="1" RadiusY="1" Fill="#A5FFFFFF" Grid.Column="0" Grid.Row="0" />
<Rectangle RadiusX="1" RadiusY="1" Fill="#A5FFFFFF" Width="19" Height="18" Margin="3,0,3,0" Grid.Column="1" Grid.Row="0" />
<Popup Placement="Bottom" StaysOpen="False" AllowsTransparency="True" Name="PART_Popup" />
</Grid>
</Grid>
</Border>
</ControlTemplate>
【讨论】：