C#WPF TreeViewItem对齐内容

Question

我对WPF元素有问题"TreeViewItem"；。也就是说，我想把内容(文本(放在中间，但不幸的是，我无法做到这一点。这是我的问题：问题图片

这里是我的代码：

var treeViewItem = new TreeViewItem
{
Header = name,
IsSelected = false,
Padding = new Thickness(0, 0, 200, 0),
HorizontalContentAlignment = HorizontalAlignment.Center
};

我希望你能帮助我，谢谢你的回答：(

Answer 1

问题的解决方案是，一开始我还必须将Padding设置为200，因此：

var treeViewItem = new TreeViewItem
{
Header = name,
IsSelected = false,
Padding = new Thickness(200, 0, 200, 0),
HorizontalContentAlignment = HorizontalAlignment.Center
};

Answer 2

正确的解决方案是覆盖TreeViewItem模板以修改内容布局。项目的内容使用Grid进行排列。您只需使包含项标头的ContentPresenter的Border跨越最后两列即可。这允许TreeViewItem拉伸以占据可用空间
作为最后一步，必须将TreeView.HorizontalContentAlignment设置为Center。

使用依赖于绝对定位的解决方案(如应用Padding或Margin(不是最佳的。这样的解决方案使整个布局保持静态。TreeView将不再正确调整大小。

TreeViewItem样式

<Style TargetType="TreeViewItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TreeViewItem">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19"
Width="Auto" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Selected">
<Storyboard>
<ColorAnimationUsingKeyFrames Storyboard.TargetName="Bd"
Storyboard.TargetProperty="(Panel.Background).
(SolidColorBrush.Color)">
<EasingColorKeyFrame KeyTime="0"
Value="{StaticResource SelectedBackgroundColor}" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unselected" />
<VisualState x:Name="SelectedInactive">
<Storyboard>
<ColorAnimationUsingKeyFrames Storyboard.TargetName="Bd"
Storyboard.TargetProperty="(Panel.Background).
(SolidColorBrush.Color)">
<EasingColorKeyFrame KeyTime="0"
Value="{StaticResource SelectedUnfocusedColor}" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ExpansionStates">
<VisualState x:Name="Expanded">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
Storyboard.TargetName="ItemsHost">
<DiscreteObjectKeyFrame KeyTime="0"
Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Collapsed" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ToggleButton x:Name="Expander"
Style="{StaticResource ExpandCollapseToggleStyle}"
ClickMode="Press"
IsChecked="{Binding IsExpanded, 
RelativeSource={RelativeSource TemplatedParent}}" />
<Border x:Name="Bd"
Grid.Column="1"
Grid.ColumnSpan="2"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}">
<ContentPresenter x:Name="PART_Header"
ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
</Border>
<ItemsPresenter x:Name="ItemsHost"
Grid.Row="1"
Grid.Column="1"
Grid.ColumnSpan="2"
Visibility="Collapsed" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems"
Value="false">
<Setter TargetName="Expander"
Property="Visibility"
Value="Hidden" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader"
Value="false" />
<Condition Property="Width"
Value="Auto" />
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header"
Property="MinWidth"
Value="75" />
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader"
Value="false" />
<Condition Property="Height"
Value="Auto" />
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header"
Property="MinHeight"
Value="19" />
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>