在UWP中，ContentDialog仅调整到一定大小，然后剪切内容 - 不滚动。如果我在内容中添加了ScrollViewer，那么它只会随着其内容的增长而增长。内容无限和滚动。
答案 0 :(得分：2)
由于我在别处找不到解决方案，这是我的：
从https://msdn.microsoft.com/en-us/library/windows/apps/mt299120.aspx复制ContentDialog的默认样式，然后更改ScrollViewer的属性：
<ScrollViewer x:Name="ContentScrollViewer"
HorizontalScrollBarVisibility="Disabled"
VerticalScrollBarVisibility="Disabled"
到
<ScrollViewer x:Name="ContentScrollViewer"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto"
听起来很简单，但我花了太多时间调试可视树来解决这个问题......
以下是您要应用于您想要滚动的ContentDialog的完整样式：
<!-- Default style for Windows.UI.Xaml.Controls.ContentDialog -->
<Style TargetType="ContentDialog" x:Key="ScrollableContentDialogStyle">
<Setter Property="Foreground" Value="{ThemeResource SystemControlPageTextBaseHighBrush}" />
<Setter Property="Background" Value="{ThemeResource SystemControlBackgroundChromeMediumLowBrush}" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="VerticalAlignment" Value="Top" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="MaxHeight" Value="{ThemeResource ContentDialogMaxHeight}" />
<Setter Property="MinHeight" Value="{ThemeResource ContentDialogMinHeight}" />
<Setter Property="MaxWidth" Value="{ThemeResource ContentDialogMaxWidth}" />
<Setter Property="MinWidth" Value="{ThemeResource ContentDialogMinWidth}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentDialog">
<Border x:Name="Container">
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Border x:Name="BackgroundElement"
Background="{TemplateBinding Background}"
FlowDirection="{TemplateBinding FlowDirection}"
BorderThickness="{ThemeResource ContentDialogBorderWidth}"
BorderBrush="{ThemeResource SystemControlForegroundAccentBrush}"
MaxWidth="{TemplateBinding MaxWidth}"
MaxHeight="{TemplateBinding MaxHeight}"
MinWidth="{TemplateBinding MinWidth}"
MinHeight="{TemplateBinding MinHeight}" >
<Grid x:Name="DialogSpace" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ScrollViewer x:Name="ContentScrollViewer"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto"
ZoomMode="Disabled"
Margin="{ThemeResource ContentDialogContentScrollViewerMargin}"
IsTabStop="False">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ContentControl x:Name="Title"
Margin="{ThemeResource ContentDialogTitleMargin}"
Content="{TemplateBinding Title}"
ContentTemplate="{TemplateBinding TitleTemplate}"
FontSize="20"
FontFamily="Segoe UI"
FontWeight="Normal"
Foreground="{TemplateBinding Foreground}"
HorizontalAlignment="Left"
VerticalAlignment="Top"
IsTabStop="False"
MaxHeight="{ThemeResource ContentDialogTitleMaxHeight}" >
<ContentControl.Template>
<ControlTemplate TargetType="ContentControl">
<ContentPresenter
Content="{TemplateBinding Content}"
MaxLines="2"
TextWrapping="Wrap"
ContentTemplate="{TemplateBinding ContentTemplate}"
Margin="{TemplateBinding Padding}"
ContentTransitions="{TemplateBinding ContentTransitions}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</ControlTemplate>
</ContentControl.Template>
</ContentControl>
<ContentPresenter x:Name="Content"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
FontSize="{ThemeResource ControlContentThemeFontSize}"
FontFamily="{ThemeResource ContentControlThemeFontFamily}"
Margin="{ThemeResource ContentDialogContentMargin}"
Foreground="{TemplateBinding Foreground}"
Grid.Row="1"
TextWrapping="Wrap" />
</Grid>
</ScrollViewer>
<Grid x:Name="CommandSpace" Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Bottom">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Border x:Name="Button1Host"
Margin="{ThemeResource ContentDialogButton1HostMargin}"
MinWidth="{ThemeResource ContentDialogButtonMinWidth}"
MaxWidth="{ThemeResource ContentDialogButtonMaxWidth}"
Height="{ThemeResource ContentDialogButtonHeight}"
HorizontalAlignment="Stretch" />
<Border x:Name="Button2Host"
Margin="{ThemeResource ContentDialogButton2HostMargin}"
MinWidth="{ThemeResource ContentDialogButtonMinWidth}"
MaxWidth="{ThemeResource ContentDialogButtonMaxWidth}"
Height="{ThemeResource ContentDialogButtonHeight}"
Grid.Column="1"
HorizontalAlignment="Stretch" />
</Grid>
</Grid>
</Border>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
答案 1 :(得分：0)
您必须使用此内容模板修改deafult ContentDialog，或者在ContentDialog中使用新样式：
<Style x:Key="MyCustomToolsContentDialog"
TargetType="ContentDialog">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentDialog">
<Border x:Name="Container">
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Border x:Name="BackgroundElement"
Background="{TemplateBinding Background}"
FlowDirection="{TemplateBinding FlowDirection}"
BorderThickness="{ThemeResource ContentDialogBorderWidth}"
BorderBrush="{ThemeResource SystemControlForegroundAccentBrush}"
MaxWidth="{TemplateBinding MaxWidth}"
MaxHeight="{TemplateBinding MaxHeight}"
MinWidth="{TemplateBinding MinWidth}"
MinHeight="{TemplateBinding MinHeight}">
<Grid x:Name="DialogSpace"
VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<!-- Modify to 'Height="*"' intead of 'Height="Auto"'-->
<RowDefinition Height="*" />
<!-- Modify to 'Height="Auto"' intead of 'Height="*"'-->
<RowDefinition Height="Auto" />
<!-- Delete' RowDefinition -->
<!--<RowDefinition Height="Auto" />-->
</Grid.RowDefinitions>
<ScrollViewer x:Name="ContentScrollViewer"
HorizontalScrollBarVisibility="Disabled"
VerticalScrollBarVisibility="Disabled"
ZoomMode="Disabled"
Margin="{ThemeResource ContentDialogContentScrollViewerMargin}"
IsTabStop="False">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<!-- Delete 'Height="Auto"' of RowDefinition.-->
<RowDefinition />
</Grid.RowDefinitions>
<ContentControl x:Name="Title"
Margin="{ThemeResource ContentDialogTitleMargin}"
Content="{TemplateBinding Title}"
ContentTemplate="{TemplateBinding TitleTemplate}"
FontSize="20"
FontFamily="Segoe UI"
FontWeight="Normal"
Foreground="{TemplateBinding Foreground}"
HorizontalAlignment="Left"
VerticalAlignment="Top"
IsTabStop="False"
MaxHeight="{ThemeResource ContentDialogTitleMaxHeight}">
<ContentControl.Template>
<ControlTemplate TargetType="ContentControl">
<ContentPresenter Content="{TemplateBinding Content}"
MaxLines="2"
TextWrapping="Wrap"
ContentTemplate="{TemplateBinding ContentTemplate}"
Margin="{TemplateBinding Padding}"
ContentTransitions="{TemplateBinding ContentTransitions}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</ControlTemplate>
</ContentControl.Template>
</ContentControl>
<ContentPresenter x:Name="Content"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
FontSize="{ThemeResource ControlContentThemeFontSize}"
FontFamily="{ThemeResource ContentControlThemeFontFamily}"
Margin="{ThemeResource ContentDialogContentMargin}"
Foreground="{TemplateBinding Foreground}"
Grid.Row="1"
TextWrapping="Wrap" />
</Grid>
</ScrollViewer>
<Grid x:Name="CommandSpace"
Grid.Row="1"
HorizontalAlignment="Stretch"
VerticalAlignment="Bottom">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Border x:Name="Button1Host"
Margin="{ThemeResource ContentDialogButton1HostMargin}"
MinWidth="{ThemeResource ContentDialogButtonMinWidth}"
MaxWidth="{ThemeResource ContentDialogButtonMaxWidth}"
Height="{ThemeResource ContentDialogButtonHeight}"
HorizontalAlignment="Stretch" />
<Border x:Name="Button2Host"
Margin="{ThemeResource ContentDialogButton2HostMargin}"
MinWidth="{ThemeResource ContentDialogButtonMinWidth}"
MaxWidth="{ThemeResource ContentDialogButtonMaxWidth}"
Height="{ThemeResource ContentDialogButtonHeight}"
Grid.Column="1"
HorizontalAlignment="Stretch" />
</Grid>
</Grid>
</Border>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
希望这对你有所帮助。
此致 Juanlu
答案 2 :(得分：0)
不确定最新的SDK中是否有一些相关的增强功能，但是至少现在可以正常工作（在没有任何新XAML的对话框中显示长文本的非常简单的方法）：
async Task ShowDialogAsync(string title, string text)
{
var dialog = new ContentDialog()
{
Title = title,
Content = new ScrollViewer()
{
Content = new TextBlock() { Text = text },
},
CloseButtonText = "ok"
};
await dialog.ShowAsync();
}