Xaml 如何在WP8 Toolkit PhoneTextBox中居中显示提示

我正在使用WP8工具包PhoneTextBox控件。我希望提示是居中的，垂直的和水平的。下面的代码得到了垂直部分，但我似乎不能削弱水平对齐

以下是文本框：

<toolkit:PhoneTextBox Name="textLongUrl" TextWrapping="Wrap" InputScope="Url" Height="150" MaxLength="250" 
                      DisplayedMaxLength="250" LengthIndicatorVisible="True" FontSize="20" 
                      Hint="Type or paste URL" HintStyle="{StaticResource HintCustomStyle}" 
                      ActionIcon="Assets\Images\icon-button-32.png"
                      ActionIconTapped="textLongUrl_ActionIconTapped" KeyDown="textLongUrl_KeyDown"  />

下面是我使用的提示样式：

<Style TargetType="ContentControl" x:Key="HintCustomStyle">
    <Setter Property="HorizontalAlignment" Value="Center"/>
    <Setter Property="VerticalAlignment" Value="Center"/>
    <Setter Property="FontSize" Value="36"/>
</Style>

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在blend中打开项目，右键单击电话文本框，然后选择编辑样式>编辑副本以编辑模板。找到名为“HintBorder”的边框，并将其展开以查看“HintContent”和“ContentElement”ContentControls。“HintBorder”就是你想要的。 选择它，然后从属性面板将水平对齐设置为中心，将垂直对齐设置为中心，这样就可以做到这一点。提示文本居中

<phone:PhoneApplicationPage.Resources>
    <Style x:Key="PhoneTextBoxHintCenterStyle" TargetType="toolkit:PhoneTextBox">
        <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/>
        <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/>
        <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/>
        <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/>
        <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/>
        <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/>
        <Setter Property="SelectionForeground" Value="{StaticResource PhoneTextBoxSelectionForegroundBrush}"/>
        <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/>
        <Setter Property="Padding" Value="{StaticResource PhoneBorderThickness}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="toolkit:PhoneTextBox">
                    <Grid x:Name="RootGrid" Background="Transparent">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="HintBorder">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Collapsed</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="TextBorder">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Visible</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="TextBorder">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="Transparent"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="TextBorder">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="HorizontalAlignment" Storyboard.TargetName="Text">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <HorizontalAlignment>Stretch</HorizontalAlignment>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="FocusStates">
                                <VisualState x:Name="Focused">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="HintBorder">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBackgroundBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="HintBorder">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBorderBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Unfocused"/>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="LengthIndicatorStates">
                                <VisualState x:Name="LengthIndicatorVisible">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Visible</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0, 0, 0, 27"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0.6"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimation Duration="0:0:0.350" To="32" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.Y)" Storyboard.TargetName="LengthIndicator">
                                            <DoubleAnimation.EasingFunction>
                                                <ExponentialEase Exponent="6"/>
                                            </DoubleAnimation.EasingFunction>
                                        </DoubleAnimation>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="LengthIndicatorHidden">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0:0:0.350" To="0" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.Y)" Storyboard.TargetName="LengthIndicator">
                                            <DoubleAnimation.EasingFunction>
                                                <ExponentialEase Exponent="6"/>
                                            </DoubleAnimation.EasingFunction>
                                        </DoubleAnimation>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0, 0, 0, 0"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0.350" Value="0"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0.350">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Collapsed</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="LengthIndicatorBorder">
                            <TextBlock x:Name="LengthIndicator" Foreground="{StaticResource PhoneContrastBackgroundBrush}" FontSize="{StaticResource PhoneFontSizeNormal}" HorizontalAlignment="Right" Margin="{StaticResource PhoneMargin}" Opacity="0" TextAlignment="Right" VerticalAlignment="Bottom">
                                <TextBlock.RenderTransform>
                                    <TranslateTransform/>
                                </TextBlock.RenderTransform>
                            </TextBlock>
                        </Border>
                        <Border x:Name="HintBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}">
                            <Grid>
                                <ContentControl x:Name="HintContent" Background="Transparent" Content="{TemplateBinding Hint}" HorizontalAlignment="Center" Margin="3,0,3,0" Style="{TemplateBinding HintStyle}" Visibility="{TemplateBinding ActualHintVisibility}" VerticalAlignment="Center"/>
                                <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/>
                            </Grid>
                        </Border>
                        <Border x:Name="TextBorder" BorderBrush="{StaticResource PhoneDisabledBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}" Visibility="Collapsed">
                            <TextBox x:Name="Text" Foreground="{StaticResource PhoneDisabledBrush}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalAlignment="Left" SelectionForeground="{TemplateBinding SelectionForeground}" SelectionBackground="{TemplateBinding SelectionBackground}" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}"/>
                        </Border>
                        <Border x:Name="ActionIconBorder" Background="Transparent" HorizontalAlignment="Right" Height="72" VerticalAlignment="Bottom" Width="84">
                            <Image x:Name="ActionIcon" Height="26" Source="{TemplateBinding ActionIcon}" Width="26"/>
                        </Border>
                        <TextBlock x:Name="MeasurementTextBlock" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsHitTestVisible="False" Margin="8" Opacity="0" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</phone:PhoneApplicationPage.Resources>

崩溃
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崩溃

问题在于工具包已经在使用预定义的模板。使用Blend可以覆盖“罐装”模板。这个解决方案对我很有效

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据我所知，这是最简单的方法。如果您愿意，这样做将为PhoneTextBox创建一个新样式。我可以将混合设计器生成的XAML代码粘贴到其中。非常感谢-每次我打开我的XAMLs时，我都会