我在WPF中使用LiveCharts来可视化一些分析的结果。分析结果将添加到SeriesCollection并显示在CartesianChart中。您可以选择要使用的系列类型：LineSeries或ColumnSeries。然后创建选定的类型并将其添加到SeriesCollection。
有一个自定义映射器，用于从ChartValues中选择X和Y值，并为X轴选择AxisFormatter。
这些图表是Blacklight.Controls.Wpf.DragDockPanelHost的一部分。每个图表都是一个DragDockPanel，具有附加的样式。图表本身是一个带有TemplateSelector的ContentControl，该控件将CartesianChart-XAML作为DataTemplate返回。
我已经尝试过手动设置系列的Fill或Stroke或在其中手动放置一些ColumnSeries，但这根本没有帮助。
SeriesCollection的填充：
private SeriesCollection _Series;
public SeriesCollection Series
{
get { return _Series; }
set { SetProperty<SeriesCollection>(ref _Series, value); }
}
...
private void createDiagram()
{
if (this._Analysis!= null && this._Diagram != null)
{
this.Series.Clear();
foreach (KeyValuePair<state, Dictionary<DateTime, int>> kvp in this.Analysis.Execute())
{
Series series = Activator.CreateInstance(Diagram) as Series;
if (series != null)
{
series.Title = kvp.Key.name;
series.Values = new ChartValues<KeyValuePair<DateTime, int>>(kvp.Value);
this.Serien.Add(series);
}
}
}
}
映射器和AxisFormatter：
CartesianMapper<KeyValuePair<DateTime, int>> mapper = Mappers.Xy<KeyValuePair<DateTime, int>>().X(kvp => ((DateTimeOffset)kvp.Key).ToUnixTimeSeconds()).Y(kvp => kvp.Value);
this.Series = new SeriesCollection(mapper);
this.XFormatter = value =>
{
return DateTimeOffset.FromUnixTimeSeconds((long)value).DateTime.ToString("dd.MM.yyyy HH:mm");
};
TemplateSelector：
public class DashboardElementTemplateSelector : DataTemplateSelector
{
public DataTemplate ListDashboardElementTemplate { get; set; }
public DataTemplate SingleValueDashboardElementTemplate { get; set; }
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
if (item is ListDashboardElementViewModel)
return this.ListDashboardElementTemplate;
else
return this.SingleValueDashboardElementTemplate;
}
}
DragDockPanelHost的XAML：
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary>
<DataTemplate x:Key="listElement">
<views:ListDashboardElementView/>
</DataTemplate>
<DataTemplate x:Key="singleValueElement">
<views:SingleValueDashboardElementView/>
</DataTemplate>
<tempselect:DashboardElementTemplateSelector x:Key="elementTempSelector"
ListDashboardElementTemplate="{StaticResource listElement}"
SingleValueDashboardElementTemplate="{StaticResource singleValueElement}"
/>
</ResourceDictionary>
<ResourceDictionary>
<conv:BooleanToVisibilityConverter x:Key="visCon"/>
</ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<bl:DragDockPanelHost ItemsSource="{Binding Diagrams}" Grid.Row="1" Margin="20" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<bl:DragDockPanelHost.Style>
<Style TargetType="bl:DragDockPanelHost">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<Canvas ClipToBounds="True" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
</Canvas>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="bl:DragDockPanelHost">
<ItemsPresenter/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</bl:DragDockPanelHost.Style>
<bl:DragDockPanelHost.DefaultPanelStyle>
<Style TargetType="{x:Type bl:DragDockPanel}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid Margin="10">
<Grid Margin="5">
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Border Background="#00000000" Margin="-2" Padding="5" Grid.Row="0">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="4*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>
<WrapPanel>
<Image Width="20" x:Name="GripBarElement" Source="/Aisys.XStorage.Dashboard;component/Images/move.png" Grid.Column="0" Cursor="Hand" HorizontalAlignment="Left"/>
<TextBlock Text="{Binding Name}" Grid.Column="0" FontSize="16" FontWeight="Bold" Margin="10,0,0,0"/>
</WrapPanel>
<WrapPanel HorizontalAlignment="Right" Grid.Column="2">
<Button Command="{Binding ExecuteCommand}" CommandParameter="{Binding}" Margin="5,0,5,0">
<Button.Template>
<ControlTemplate>
<Image Source="/Aisys.XStorage.Dashboard;component/Images/Refresh.png"/>
</ControlTemplate>
</Button.Template>
</Button>
<Button Width="20" Command="{Binding DataContext.RemoveDiagramCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type bl:DragDockPanelHost}}}" CommandParameter="{Binding}">
<Button.Template>
<ControlTemplate>
<Image Source="/Aisys.XStorage.Dashboard;component/Images/Remove.png"/>
</ControlTemplate>
</Button.Template>
</Button>
<Button Command="{Binding DataContext.ShowPropertiesCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type bl:DragDockPanelHost}}}" CommandParameter="{Binding}" Margin="5,0,5,0">
<Button.Template>
<ControlTemplate>
<Image Source="/Aisys.XStorage.Dashboard;component/Images/Preferences.png"/>
</ControlTemplate>
</Button.Template>
</Button>
<ToggleButton x:Name="MaximizeToggleButton" VerticalAlignment="Top" HorizontalAlignment="Right" IsChecked="{Binding RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay, Path=IsMaximized}" Margin="0,5,5,0" Width="25" Height="25" Cursor="Hand">
<ToggleButton.Template>
<ControlTemplate TargetType="ToggleButton">
<Image Source="/Aisys.XStorage.Dashboard;component/Images/Maximize.png" Margin="0,0,0,5"/>
</ControlTemplate>
</ToggleButton.Template>
</ToggleButton>
</WrapPanel>
</Grid>
</Border>
<Separator VerticalAlignment="Bottom" Margin="0,0,0,0"/>
<ContentControl Content="{Binding}" ContentTemplateSelector="{StaticResource elementTempSelector}" Grid.Row="1" Margin="10"/>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</bl:DragDockPanelHost.DefaultPanelStyle>
</bl:DragDockPanelHost>
图表的XAML：
<Grid>
<lvc:CartesianChart Series="{Binding Series}" LegendLocation="Right" Name="chart">
<lvc:CartesianChart.AxisX>
<lvc:Axis Title="Zeit" LabelFormatter="{Binding XFormatter}">
</lvc:Axis>
</lvc:CartesianChart.AxisX>
</lvc:CartesianChart>
</Grid>
如果我选择LineSeries，一切正常。但是，当我使用ColumnSeries时，什么也没显示。您会看到，轴已重画并且分隔符移动了。图例也已绘制，但没有可见的列。
有任何想法为什么会这样？
答案 0 :(得分：0)
我最近有同样的问题。不幸的是，这似乎没有在任何地方得到记录，但是由于某种原因如果您的图表大小的数据点太多，那么将不会显示任何列。您可以尝试减少数据点的数量，直到它起作用为止（在我的情况下，将不显示90个数据点，但将显示30个），或者您可以将on ColumnSeries there is a property ColumnPadding降低为零，看看是否有帮助。 / p>