Generic.xaml 不使用 App.xaml 中设置的系统参数
Generic.xaml doesn't use SystemParameters set in App.xaml
要自定义 ScrollBar 的外观，我设置了这些：
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">15</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">15</sys:Double>
在 App.xaml 和 Themes\Generic.xaml 中，我的一些自定义控件 Grid.Column 定义如下：
<ColumnDefinition Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}"/>
看起来我的自定义控件实际上不使用 15 作为 Width。有什么方法可以强制 Themes\Generic.xaml 中定义的自定义控件样式使用 App.xaml 中设置的这些值？
编辑
这是我现在 App.xaml 的内容：
<Application x:Class="RentManager.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:RentManager"
xmlns:sys="clr-namespace:System;assembly=System.Runtime"
xmlns:cc="clr-namespace:RentManager.CustomControl"
xmlns:con="clr-namespace:RentManager.Common"
StartupUri="Main.xaml">
<Application.Resources>
<ResourceDictionary>
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">12</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">12</sys:Double>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/RentManager;component/Themes/Generic.xaml" />
<ResourceDictionary Source="pack://application:,,,/RentManager;component/Themes/OtherStyle.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
当滚动条出现时，我遇到问题的 userControl 看起来像这样：
查看 Receivable/Payment 列中的错位。这是没有滚动条的样子：
Ledger 的自定义控件是：
<Style TargetType="{x:Type local:Ledger}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:Ledger}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}"/>
</Grid.ColumnDefinitions>
<Grid.Resources>
<Style TargetType="TextBlock">
<Setter Property="Grid.Row" Value="1"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="VerticalAlignment" Value="Center"/>
</Style>
</Grid.Resources>
<Border Grid.Row="1" Grid.ColumnSpan="5" Background="AliceBlue"/>
<Separator Grid.Row="0" Grid.ColumnSpan="5"/>
<TextBlock Text="Date" Margin="20 0 0 0"/>
<TextBlock Grid.Column="1" Text="Particulars"/>
<TextBlock Grid.Column="2" HorizontalAlignment="Right">
<Run Text="Receivable"/>
<LineBreak/>
<Run Text="/ Payment"/>
</TextBlock>
<TextBlock Grid.Column="3" HorizontalAlignment="Right" Text="Receipt"/>
<TextBlock Grid.Column="4" HorizontalAlignment="Right" Text="Balance" Margin="0 0 20 0"/>
<Separator Grid.Row="2" Grid.ColumnSpan="5"/>
</Grid>
<ItemsControl Grid.Row="1"
ItemsSource="{TemplateBinding Source}"
HorizontalContentAlignment="Stretch"
VirtualizingStackPanel.IsVirtualizing="True"
VirtualizingStackPanel.VirtualizationMode="Recycling"
ScrollViewer.CanContentScroll="True">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer VerticalScrollBarVisibility="Auto" x:Name="scroll">
<ItemsPresenter/>
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid >
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Date, StringFormat='dd MMM yyyy'}" Margin="20 0 0 0"/>
<ContentControl Grid.Column="1">
<ContentControl.Style>
<Style BasedOn="{StaticResource {x:Type ContentControl}}" TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="{Binding DataContext.SelectedTab.Type, RelativeSource={RelativeSource AncestorType={x:Type local:Ledger}}}" Value="Plot">
<Setter Property="Content">
<Setter.Value>
<TextBlock TextWrapping="Wrap">
<Run Text="{Binding SpaceName}"/>
<Run Text=": "/>
<Run Text="{Binding TenantName}"/>
<Run Text=" - "/>
<Run Text="{Binding HeadName}"/>
<Run Text=" | "/>
<Run Text="{Binding Narration}" FontStyle="Italic" Foreground="Blue"/>
</TextBlock>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding DataContext.SelectedTab.Type, RelativeSource={RelativeSource AncestorType={x:Type local:Ledger}}}" Value="Space">
<Setter Property="Content">
<Setter.Value>
<TextBlock TextWrapping="Wrap">
<Run Text="{Binding PlotName}"/>
<Run Text=": "/>
<Run Text="{Binding TenantName}"/>
<Run Text=" - "/>
<Run Text="{Binding HeadName}"/>
<Run Text=" | "/>
<Run Text="{Binding Narration}" FontStyle="Italic" Foreground="Blue"/>
</TextBlock>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding DataContext.SelectedTab.Type, RelativeSource={RelativeSource AncestorType={x:Type local:Ledger}}}" Value="Tenant">
<Setter Property="Content">
<Setter.Value>
<TextBlock TextWrapping="Wrap">
<Run Text="{Binding PlotName}"/>
<Run Text=": "/>
<Run Text="{Binding SpaceName}"/>
<Run Text=" - "/>
<Run Text="{Binding HeadName}"/>
<Run Text=" | "/>
<Run Text="{Binding Narration}" FontStyle="Italic" Foreground="Blue"/>
</TextBlock>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
<local:NumReport Grid.Column="2" Text="{Binding Receivable}" />
<local:NumReport Grid.Column="3" Text="{Binding Receipt}" />
<local:NumReport Grid.Column="4" Text="{Binding Balance}" Margin="0 0 20 0"/>
<Border Grid.Column="5" Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}">
<Border.Style>
<Style TargetType="Border">
<Style.Triggers>
<DataTrigger Binding="{Binding ComputedVerticalScrollBarVisibility, ElementName=scroll}" Value="Visible">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
</Border>
<Separator Grid.Row="1" Grid.ColumnSpan="5" Background="LightBlue" Margin="0 5 0 5"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<Grid Grid.Row="2">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}"/>
</Grid.ColumnDefinitions>
<Border Grid.Row="1" Grid.ColumnSpan="5" Background="AliceBlue"/>
<Separator Grid.Row="0" Grid.ColumnSpan="5"/>
<TextBlock Grid.Row="1" Text="Total" FontWeight="Bold" Margin="20 0 0 0"/>
<local:NumReport Grid.Row="1" Grid.Column="2" FontWeight="Bold" Text="{Binding TotalReceivable}"/>
<local:NumReport Grid.Row="1" Grid.Column="3" FontWeight="Bold" Text="{Binding TotalReceipt}"/>
<Separator Grid.Row="2" Grid.ColumnSpan="5"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
没有这两行：
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">12</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">12</sys:Double>
在 App.xaml 它按预期工作！另一件事是在 App.xaml 中添加那些 MergedDictionaries 之后，现在我的 Generic.xaml.
上到处都是红色波浪线
编辑
如果我不更改 App.xaml 中的那些参数，它看起来符合预期：
将资源添加到 App.xaml 确实有效。
你引用 ResourceDictionary 的方式是错误的。您应该将其合并到 App.xaml:
<Application x:Class="WpfApp1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml"
xmlns:sys="clr-namespace:System;assembly=System.Runtime">
<Application.Resources>
<ResourceDictionary>
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">15</sys:Double>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/RentManager;component/Themes/Generic.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
我不确定我是否正确，实际上无法更改常量 VerticalScrollBarWidth 或 HorizontalScrollBarHeight（在我的情况下，宽度和高度始终为 17）但是在运行 系统使用这些键值根据您想要的宽度呈现应用程序滚动条的时间。因此，在我看来，最好的解决方法是在某个地方声明一个常量，如下所示：
public const double ScrollBarThickness = 12;
而不是设置这些：
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">12</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">12</sys:Double>
in App.xaml 以这种方式设置 App.xaml.cs 中的那些值：
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
Resources.Add(SystemParameters.VerticalScrollBarWidthKey, Constants.ScrollBarThickness);
Resources.Add(SystemParameters.HorizontalScrollBarHeightKey, Constants.ScrollBarThickness);
}
并在任何需要的地方使用绑定中的常量。在我的例子中：我会像这样在我的自定义控件中重新定义这两个 Grid.Column 定义和虚拟边框的宽度：
<ColumnDefinition Width="{Binding Source={x:Static con:Constants.ScrollBarThickness}}"/>
<Border Grid.Column="5" Width="{Binding Source={x:Static con:Constants.ScrollBarThickness}}">
实际上我根本不需要那些合并技术，没有这些技术也能正常工作！我也很想在 App.xaml 中绑定常量，但我不知道如何为 VerticalScrollBarWidthKey 或 VerticalScrollBarWidthKey 定义样式。 属性 姓名 (???):
<Style x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">
<Setter Property="???" Value="{Binding Source={x:Static con:Constants.ScrollBarThickness}}"/>
</Style>
如果我想在 App.xaml 而不是 App.xaml.cs 中绑定？
要自定义 ScrollBar 的外观，我设置了这些：
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">15</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">15</sys:Double>
在 App.xaml 和 Themes\Generic.xaml 中，我的一些自定义控件 Grid.Column 定义如下：
<ColumnDefinition Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}"/>
看起来我的自定义控件实际上不使用 15 作为 Width。有什么方法可以强制 Themes\Generic.xaml 中定义的自定义控件样式使用 App.xaml 中设置的这些值？
编辑
这是我现在 App.xaml 的内容：
<Application x:Class="RentManager.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:RentManager"
xmlns:sys="clr-namespace:System;assembly=System.Runtime"
xmlns:cc="clr-namespace:RentManager.CustomControl"
xmlns:con="clr-namespace:RentManager.Common"
StartupUri="Main.xaml">
<Application.Resources>
<ResourceDictionary>
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">12</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">12</sys:Double>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/RentManager;component/Themes/Generic.xaml" />
<ResourceDictionary Source="pack://application:,,,/RentManager;component/Themes/OtherStyle.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
当滚动条出现时，我遇到问题的 userControl 看起来像这样：
查看 Receivable/Payment 列中的错位。这是没有滚动条的样子：
Ledger 的自定义控件是：
<Style TargetType="{x:Type local:Ledger}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:Ledger}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}"/>
</Grid.ColumnDefinitions>
<Grid.Resources>
<Style TargetType="TextBlock">
<Setter Property="Grid.Row" Value="1"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="VerticalAlignment" Value="Center"/>
</Style>
</Grid.Resources>
<Border Grid.Row="1" Grid.ColumnSpan="5" Background="AliceBlue"/>
<Separator Grid.Row="0" Grid.ColumnSpan="5"/>
<TextBlock Text="Date" Margin="20 0 0 0"/>
<TextBlock Grid.Column="1" Text="Particulars"/>
<TextBlock Grid.Column="2" HorizontalAlignment="Right">
<Run Text="Receivable"/>
<LineBreak/>
<Run Text="/ Payment"/>
</TextBlock>
<TextBlock Grid.Column="3" HorizontalAlignment="Right" Text="Receipt"/>
<TextBlock Grid.Column="4" HorizontalAlignment="Right" Text="Balance" Margin="0 0 20 0"/>
<Separator Grid.Row="2" Grid.ColumnSpan="5"/>
</Grid>
<ItemsControl Grid.Row="1"
ItemsSource="{TemplateBinding Source}"
HorizontalContentAlignment="Stretch"
VirtualizingStackPanel.IsVirtualizing="True"
VirtualizingStackPanel.VirtualizationMode="Recycling"
ScrollViewer.CanContentScroll="True">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer VerticalScrollBarVisibility="Auto" x:Name="scroll">
<ItemsPresenter/>
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid >
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Date, StringFormat='dd MMM yyyy'}" Margin="20 0 0 0"/>
<ContentControl Grid.Column="1">
<ContentControl.Style>
<Style BasedOn="{StaticResource {x:Type ContentControl}}" TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="{Binding DataContext.SelectedTab.Type, RelativeSource={RelativeSource AncestorType={x:Type local:Ledger}}}" Value="Plot">
<Setter Property="Content">
<Setter.Value>
<TextBlock TextWrapping="Wrap">
<Run Text="{Binding SpaceName}"/>
<Run Text=": "/>
<Run Text="{Binding TenantName}"/>
<Run Text=" - "/>
<Run Text="{Binding HeadName}"/>
<Run Text=" | "/>
<Run Text="{Binding Narration}" FontStyle="Italic" Foreground="Blue"/>
</TextBlock>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding DataContext.SelectedTab.Type, RelativeSource={RelativeSource AncestorType={x:Type local:Ledger}}}" Value="Space">
<Setter Property="Content">
<Setter.Value>
<TextBlock TextWrapping="Wrap">
<Run Text="{Binding PlotName}"/>
<Run Text=": "/>
<Run Text="{Binding TenantName}"/>
<Run Text=" - "/>
<Run Text="{Binding HeadName}"/>
<Run Text=" | "/>
<Run Text="{Binding Narration}" FontStyle="Italic" Foreground="Blue"/>
</TextBlock>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding DataContext.SelectedTab.Type, RelativeSource={RelativeSource AncestorType={x:Type local:Ledger}}}" Value="Tenant">
<Setter Property="Content">
<Setter.Value>
<TextBlock TextWrapping="Wrap">
<Run Text="{Binding PlotName}"/>
<Run Text=": "/>
<Run Text="{Binding SpaceName}"/>
<Run Text=" - "/>
<Run Text="{Binding HeadName}"/>
<Run Text=" | "/>
<Run Text="{Binding Narration}" FontStyle="Italic" Foreground="Blue"/>
</TextBlock>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
<local:NumReport Grid.Column="2" Text="{Binding Receivable}" />
<local:NumReport Grid.Column="3" Text="{Binding Receipt}" />
<local:NumReport Grid.Column="4" Text="{Binding Balance}" Margin="0 0 20 0"/>
<Border Grid.Column="5" Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}">
<Border.Style>
<Style TargetType="Border">
<Style.Triggers>
<DataTrigger Binding="{Binding ComputedVerticalScrollBarVisibility, ElementName=scroll}" Value="Visible">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
</Border>
<Separator Grid.Row="1" Grid.ColumnSpan="5" Background="LightBlue" Margin="0 5 0 5"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<Grid Grid.Row="2">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="{Binding Source={x:Static SystemParameters.VerticalScrollBarWidth}}"/>
</Grid.ColumnDefinitions>
<Border Grid.Row="1" Grid.ColumnSpan="5" Background="AliceBlue"/>
<Separator Grid.Row="0" Grid.ColumnSpan="5"/>
<TextBlock Grid.Row="1" Text="Total" FontWeight="Bold" Margin="20 0 0 0"/>
<local:NumReport Grid.Row="1" Grid.Column="2" FontWeight="Bold" Text="{Binding TotalReceivable}"/>
<local:NumReport Grid.Row="1" Grid.Column="3" FontWeight="Bold" Text="{Binding TotalReceipt}"/>
<Separator Grid.Row="2" Grid.ColumnSpan="5"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
没有这两行：
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">12</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">12</sys:Double>
在 App.xaml 它按预期工作！另一件事是在 App.xaml 中添加那些 MergedDictionaries 之后，现在我的 Generic.xaml.
编辑
如果我不更改 App.xaml 中的那些参数，它看起来符合预期：
将资源添加到 App.xaml 确实有效。
你引用 ResourceDictionary 的方式是错误的。您应该将其合并到 App.xaml:
<Application x:Class="WpfApp1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="MainWindow.xaml"
xmlns:sys="clr-namespace:System;assembly=System.Runtime">
<Application.Resources>
<ResourceDictionary>
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">15</sys:Double>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/RentManager;component/Themes/Generic.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
我不确定我是否正确，实际上无法更改常量 VerticalScrollBarWidth 或 HorizontalScrollBarHeight（在我的情况下，宽度和高度始终为 17）但是在运行 系统使用这些键值根据您想要的宽度呈现应用程序滚动条的时间。因此，在我看来，最好的解决方法是在某个地方声明一个常量，如下所示：
public const double ScrollBarThickness = 12;
而不是设置这些：
<sys:Double x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">12</sys:Double>
<sys:Double x:Key="{x:Static SystemParameters.HorizontalScrollBarHeightKey}">12</sys:Double>
in App.xaml 以这种方式设置 App.xaml.cs 中的那些值：
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
Resources.Add(SystemParameters.VerticalScrollBarWidthKey, Constants.ScrollBarThickness);
Resources.Add(SystemParameters.HorizontalScrollBarHeightKey, Constants.ScrollBarThickness);
}
并在任何需要的地方使用绑定中的常量。在我的例子中：我会像这样在我的自定义控件中重新定义这两个 Grid.Column 定义和虚拟边框的宽度：
<ColumnDefinition Width="{Binding Source={x:Static con:Constants.ScrollBarThickness}}"/>
<Border Grid.Column="5" Width="{Binding Source={x:Static con:Constants.ScrollBarThickness}}">
实际上我根本不需要那些合并技术，没有这些技术也能正常工作！我也很想在 App.xaml 中绑定常量，但我不知道如何为 VerticalScrollBarWidthKey 或 VerticalScrollBarWidthKey 定义样式。 属性 姓名 (???):
<Style x:Key="{x:Static SystemParameters.VerticalScrollBarWidthKey}">
<Setter Property="???" Value="{Binding Source={x:Static con:Constants.ScrollBarThickness}}"/>
</Style>
如果我想在 App.xaml 而不是 App.xaml.cs 中绑定？