如何更改 DatePicker 内部文本框的背景颜色答案

【问题标题】：How to Change BackgroundColor of DatePicker's inner Textbox如何更改 DatePicker 内部文本框的背景颜色
【发布时间】：2017-11-10 10:16:51
【问题描述】：

我想要做的是从TextBox 中的DatePicker 中更改Background。

我尝试通过添加<Style TargetType="{x:Type DatePickerTextBox}" 使其工作，但没有成功，因为我已经有其他<Style>。

这是我的<DatePicker>：

                    <DatePicker Grid.Column="1" Grid.Row="0"
                                VerticalContentAlignment="Center" MinHeight="20">
                       <DatePicker.SelectedDate>
                            <Binding Path="ViewModel.Value" UpdateSourceTrigger="PropertyChanged" 
                                     RelativeSource="{RelativeSource TemplatedParent}"/>
                        </DatePicker.SelectedDate>

                        <DatePicker.Style>
                            <Style TargetType="{x:Type DatePicker}">
                                <Setter Property="Background" Value="White"/>
                                <Style.Triggers>
                                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                                        Path=ViewModel.IsDirty}" Value="true">
                                        <Setter Property="Background" Value="LightYellow"/>
                                    </DataTrigger>
                                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                                        Path=ViewModel.IsInvalid}" Value="true">
                                        <Setter Property="BorderBrush" Value="Red"/>
                                    </DataTrigger>
                                </Style.Triggers>
                            </Style>
                        </DatePicker.Style>
                    </DatePicker>

所以当IsDirty被触发时，Background得到LightYellow，但内部TextBoxBackground仍然是White。

我该如何更改这个Background？

【问题讨论】：

标签： c# wpf datepicker

【解决方案1】：

您需要定义自己的自定义ControlTemplate：

<DatePicker>
    <DatePicker.Template>
        <ControlTemplate>
            <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}">
                <VisualStateManager.VisualStateGroups>
                    <VisualStateGroup x:Name="CommonStates">
                        <VisualState x:Name="Normal"/>
                        <VisualState x:Name="Disabled">
                            <Storyboard>
                                <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_DisabledVisual"/>
                            </Storyboard>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>
                <Grid x:Name="PART_Root" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                    <Grid.Resources>
                        <SolidColorBrush x:Key="DisabledBrush" Color="#A5FFFFFF"/>
                        <ControlTemplate x:Key="DropDownButtonTemplate" TargetType="{x:Type Button}">
                            <Grid>
                                <VisualStateManager.VisualStateGroups>
                                    <VisualStateGroup x:Name="CommonStates">
                                        <VisualStateGroup.Transitions>
                                            <VisualTransition GeneratedDuration="0"/>
                                            <VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver"/>
                                            <VisualTransition GeneratedDuration="0:0:0.1" To="Pressed"/>
                                        </VisualStateGroup.Transitions>
                                        <VisualState x:Name="Normal"/>
                                        <VisualState x:Name="MouseOver">
                                            <Storyboard>
                                                <ColorAnimation Duration="0" To="#FF448DCA" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Background"/>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#7FFFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#CCFFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                            </Storyboard>
                                        </VisualState>
                                        <VisualState x:Name="Pressed">
                                            <Storyboard>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Background">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#FF448DCA"/>
                                                </ColorAnimationUsingKeyFrames>
                                                <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="Highlight">
                                                    <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
                                                </DoubleAnimationUsingKeyFrames>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#EAFFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#C6FFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#6BFFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                                <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                    <SplineColorKeyFrame KeyTime="0" Value="#F4FFFFFF"/>
                                                </ColorAnimationUsingKeyFrames>
                                            </Storyboard>
                                        </VisualState>
                                        <VisualState x:Name="Disabled"/>
                                    </VisualStateGroup>
                                </VisualStateManager.VisualStateGroups>
                                <Grid Background="#11FFFFFF" FlowDirection="LeftToRight" HorizontalAlignment="Center" Height="18" Margin="0" VerticalAlignment="Center" Width="19">
                                    <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 x:Name="Highlight" BorderBrush="#FF45D6FA" BorderThickness="1" Grid.ColumnSpan="4" CornerRadius="0,0,1,1" Margin="-1" Opacity="0" Grid.Row="0" Grid.RowSpan="4"/>
                                    <Border x:Name="Background" BorderBrush="#FFFFFFFF" BorderThickness="1" Background="#FF1F3B53" Grid.ColumnSpan="4" CornerRadius=".5" Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.RowSpan="3"/>
                                    <Border x:Name="BackgroundGradient" BorderBrush="#BF000000" BorderThickness="1" Grid.ColumnSpan="4" CornerRadius=".5" Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.RowSpan="3">
                                        <Border.Background>
                                            <LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
                                                <GradientStop Color="#FFFFFFFF" Offset="0"/>
                                                <GradientStop Color="#F9FFFFFF" Offset="0.375"/>
                                                <GradientStop Color="#E5FFFFFF" Offset="0.625"/>
                                                <GradientStop Color="#C6FFFFFF" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Border.Background>
                                    </Border>
                                    <Rectangle Grid.ColumnSpan="4" Grid.RowSpan="1" StrokeThickness="1">
                                        <Rectangle.Fill>
                                            <LinearGradientBrush EndPoint="0.3,-1.1" StartPoint="0.46,1.6">
                                                <GradientStop Color="#FF4084BD"/>
                                                <GradientStop Color="#FFAFCFEA" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Rectangle.Fill>
                                        <Rectangle.Stroke>
                                            <LinearGradientBrush EndPoint="0.48,-1" StartPoint="0.48,1.25">
                                                <GradientStop Color="#FF494949"/>
                                                <GradientStop Color="#FF9F9F9F" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Rectangle.Stroke>
                                    </Rectangle>
                                    <Path Grid.ColumnSpan="4" Grid.Column="0" Data="M11.426758,8.4305077 L11.749023,8.4305077 L11.749023,16.331387 L10.674805,16.331387 L10.674805,10.299648 L9.0742188,11.298672 L9.0742188,10.294277 C9.4788408,10.090176 9.9094238,9.8090878 10.365967,9.4510155 C10.82251,9.0929432 11.176106,8.7527733 11.426758,8.4305077 z M14.65086,8.4305077 L18.566387,8.4305077 L18.566387,9.3435936 L15.671368,9.3435936 L15.671368,11.255703 C15.936341,11.058764 16.27293,10.960293 16.681133,10.960293 C17.411602,10.960293 17.969301,11.178717 18.354229,11.615566 C18.739157,12.052416 18.931622,12.673672 18.931622,13.479336 C18.931622,15.452317 18.052553,16.438808 16.294415,16.438808 C15.560365,16.438808 14.951641,16.234707 14.468243,15.826504 L14.881817,14.929531 C15.368796,15.326992 15.837872,15.525723 16.289043,15.525723 C17.298809,15.525723 17.803692,14.895514 17.803692,13.635098 C17.803692,12.460618 17.305971,11.873379 16.310528,11.873379 C15.83071,11.873379 15.399232,12.079271 15.016094,12.491055 L14.65086,12.238613 z" Fill="#FF2F2F2F" HorizontalAlignment="Center" Margin="4,3,4,3" Grid.Row="1" Grid.RowSpan="3" RenderTransformOrigin="0.5,0.5" Stretch="Fill" VerticalAlignment="Center"/>
                                    <Ellipse Grid.ColumnSpan="4" Fill="#FFFFFFFF" HorizontalAlignment="Center" Height="3" StrokeThickness="0" VerticalAlignment="Center" Width="3"/>
                                    <Border x:Name="DisabledVisual" BorderBrush="#B2FFFFFF" BorderThickness="1" Grid.ColumnSpan="4" CornerRadius="0,0,.5,.5" Opacity="0" Grid.Row="0" Grid.RowSpan="4"/>
                                </Grid>
                            </Grid>
                        </ControlTemplate>
                    </Grid.Resources>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                    <Button x:Name="PART_Button" Grid.Column="1" Foreground="{TemplateBinding Foreground}" Focusable="False" HorizontalAlignment="Left" Margin="3,0,3,0" Grid.Row="0" Template="{StaticResource DropDownButtonTemplate}" VerticalAlignment="Top" Width="20"/>
                    <DatePickerTextBox x:Name="PART_TextBox" Grid.Column="0" 
                                               Focusable="{TemplateBinding Focusable}" 
                                               HorizontalContentAlignment="Stretch" 
                                               Grid.Row="0" VerticalContentAlignment="Stretch">
                        <DatePickerTextBox.Template>
                            <ControlTemplate TargetType="DatePickerTextBox">
                                <Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="1" Opacity="1" Padding="{TemplateBinding Padding}">
                                    <Grid x:Name="WatermarkContent" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                                        <Border x:Name="ContentElement" BorderBrush="#FFFFFFFF" BorderThickness="1"/>
                                        <Border x:Name="watermark_decorator" BorderBrush="#FFFFFFFF" BorderThickness="1">
                                            <ContentControl x:Name="PART_Watermark" Focusable="False" IsHitTestVisible="False" Opacity="0" Padding="2"/>
                                        </Border>
                                        <ScrollViewer x:Name="PART_ContentHost" Background="{TemplateBinding Background}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                        <Border x:Name="FocusVisual" BorderBrush="#FF45D6FA" CornerRadius="1" IsHitTestVisible="False" Opacity="0"/>
                                    </Grid>
                                </Border>
                            </ControlTemplate>
                        </DatePickerTextBox.Template>
                    </DatePickerTextBox>
                    <Grid x:Name="PART_DisabledVisual" Grid.ColumnSpan="2" Grid.Column="0" IsHitTestVisible="False" Opacity="0" Grid.Row="0">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Rectangle Grid.Column="0" Fill="#A5FFFFFF" RadiusY="1" Grid.Row="0" RadiusX="1"/>
                        <Rectangle Grid.Column="1" Fill="#A5FFFFFF" Height="18" Margin="3,0,3,0" RadiusY="1" Grid.Row="0" RadiusX="1" Width="19"/>
                        <Popup x:Name="PART_Popup" AllowsTransparency="True" Placement="Bottom" PlacementTarget="{Binding ElementName=PART_TextBox}" StaysOpen="False"/>
                    </Grid>
                </Grid>
            </Border>
            <ControlTemplate.Triggers>
                <DataTrigger Binding="{Binding Source={x:Static SystemParameters.HighContrast}}" Value="false">
                    <Setter Property="Foreground" TargetName="PART_TextBox" Value="{Binding Foreground, RelativeSource={RelativeSource TemplatedParent}}"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                             Path=ViewModel.IsDirty}" Value="true">
                    <Setter Property="Background" Value="LightYellow"/>
                    <Setter TargetName="PART_TextBox" Property="Background" Value="LightYellow" />
                </DataTrigger>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                             Path=ViewModel.IsInvalid}" Value="true">
                    <Setter Property="BorderBrush" Value="Red"/>
                </DataTrigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </DatePicker.Template>
</DatePicker>

【讨论】：

你能告诉我在哪里可以设置DatePickerTextBox 中的CornerRadius 和Height 吗？我已经从PART_Root 设置了CornerRadius，但似乎DatePickerTextBox 以某种方式覆盖了角落。此外，我更改了Icon，不幸的是我的Icon 比原来的要小，所以DatePickerTextBox 和Icon 之间的高度差异很小。 - 谢谢

【解决方案2】：

在您的Style 中，只需将所需的DatePickerTextBox 样式添加为资源：

<Style TargetType="{x:Type DatePicker}">
    <Style.Resources>
        <Style TargetType="DatePickerTextBox">
            <Setter Property="Background" Value="Transparent"/>
        </Style>
    </Style.Resources>
    <Setter Property="Background" Value="White"/>
    <Style.Triggers>
        <!-- your triggers here -->
    </Style.Triggers>
</Style>

【讨论】：

谢谢你为我工作。现在我想在MouseOver 为true 时更改DatePickerTextBox 边框颜色。我通过将<Setter Property="BorderBrush" Value="Red"/> 添加到<Style.Resources> 来尝试它，但它不起作用。你有什么提示吗？
你应该问另一个问题，因为你描述的用例是不同的。

【解决方案3】：

可以定期设置背景，给DatePicker设置样式，设置属性如<LinearGradientBrush>或<SolidColorBrush>

（对dymanoid答案的改进）

<DatePicker FontSize="22" 
            Text="{Binding Date, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" 
            Margin="5 0">
            <DatePicker.Background>
                <SolidColorBrush Color="White" Opacity="0.35"/>
            </DatePicker.Background>
            <DatePicker.Style>
                <Style TargetType="{x:Type DatePicker}">
                    <Style.Resources>
                        <Style TargetType="DatePickerTextBox">
                            <Setter Property="Background">
                                <Setter.Value>
                                    <SolidColorBrush Color="White" Opacity="0"/>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </Style.Resources>
                </Style>
           </DatePicker.Style>
</DatePicker>

【讨论】：