我有一个主数据网格，然后在其下面有一个手风琴控件。在其中一个手风琴项目中，我有另一个数据网格，该数据网格绑定到第一个数据网格的所选项目。简单的xaml是：
<sdk:DataGrid Name="dgMain" ItemsSource="{Binding SomeSource}" />
<toolkit:Accordion>
<toolkit:AccordionItem Header="Details">
<sdk:DataGrid ItemsSource="{Binding ElementName=dgMain, Path=SelectedItem.Children}"/>
</toolkit:AccordionItem>
</toolkit:Accordion>
我将第二个网格的VerticalAlignment属性设置为“拉伸”，因此它绑定了不同的集合大小时会拉伸，但是问题是它只在AccordionItem大小内拉伸，所以如果我在第一个网格中选择一个包含更多内容的新项目“儿童”，然后我必须滚动第二个网格，因为AccordionItem不变。
仅当我压缩并再次扩展它时，AccordionItem区域才会更改。将手风琴项目的VerticalContentAlignment设置为“ Stretch”无效。我猜是因为它只有在第一次扩展时才触发它。
有谁知道我还能尝试什么，或者我是否缺少某些东西。我希望坚持使用xaml解决方案，以便我对MVVM保持友好，但很高兴听到一切。
最佳答案
AccordionItem不能正确调整大小的原因是因为其控制部件之一-ExpandableContentControl中存在错误。 here中描述了该问题。
我认为您既可以修复其源代码，也可以更轻松地用默认的ContentControl将其控件从其默认样式替换。我在此处包括了带有普通ContentControl的样式，并在@JohnNicholas提供的代码中对其进行了测试，并且该样式可以正常工作。
<Style TargetType="toolkit:AccordionItem">
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="BorderBrush" Value="#FFECECEC"/>
<Setter Property="Background" Value="White"/>
<Setter Property="Margin" Value="0"/>
<Setter Property="Padding" Value="0"/>
<Setter Property="HorizontalAlignment" Value="Stretch"/>
<Setter Property="VerticalAlignment" Value="Stretch"/>
<Setter Property="HorizontalContentAlignment" Value="Left"/>
<Setter Property="VerticalContentAlignment" Value="Top"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="toolkit:AccordionItem">
<Grid Background="{TemplateBinding Background}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" VerticalAlignment="{TemplateBinding VerticalAlignment}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="Pressed"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Disabled"/>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused"/>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
<VisualStateGroup x:Name="ExpansionStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Collapsed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Expanded">
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="LockedStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Locked">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="IsEnabled" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="False"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unlocked">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="IsEnabled" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="True"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ExpandDirectionStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="ExpandDown">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Height" Storyboard.TargetName="rd1">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Width" Storyboard.TargetName="cd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ExpandUp">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Row)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Row)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Height" Storyboard.TargetName="rd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Width" Storyboard.TargetName="cd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ExpandLeft">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.ColumnSpan)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.ColumnSpan)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.RowSpan)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="2"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.RowSpan)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="2"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Column)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Row)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Height" Storyboard.TargetName="rd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Width" Storyboard.TargetName="cd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ExpandRight">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.ColumnSpan)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.ColumnSpan)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.RowSpan)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="2"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.RowSpan)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="2"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Row)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Column)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Height" Storyboard.TargetName="rd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Width" Storyboard.TargetName="cd1">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border x:Name="Background" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="1,1,1,1" Padding="{TemplateBinding Padding}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="cd0" Width="Auto"/>
<ColumnDefinition x:Name="cd1" Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition x:Name="rd0" Height="Auto"/>
<RowDefinition x:Name="rd1" Height="Auto"/>
</Grid.RowDefinitions>
<toolkit:AccordionButton x:Name="ExpanderButton" Background="{TemplateBinding Background}" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" Foreground="{TemplateBinding Foreground}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsTabStop="True" IsChecked="{TemplateBinding IsSelected}" Margin="0,0,0,0" Padding="0,0,0,0" Grid.Row="0" Style="{TemplateBinding AccordionButtonStyle}" VerticalAlignment="{TemplateBinding VerticalAlignment}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
<ContentControl x:Name="ExpandSite" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Foreground="{TemplateBinding Foreground}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsTabStop="False" Margin="0,0,0,0" Grid.Row="1" Style="{TemplateBinding ExpandableContentControlStyle}" VerticalAlignment="{TemplateBinding VerticalAlignment}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
PS。如果要对展开/折叠进行动画处理，则可以在
AccordionItem的Collapsed和Expanded视觉状态下定义自己的动画。这确实是一个迟来的答复，希望对您有所帮助。 :)