我使用实时图表库,但我在显示图表时遇到问题。事实上,在我的窗口中,我想要许多具有多种类型的图表,所以我使用 DataTemplateSelector,链接到每种图表类型的类。但是,当图表出现时,上面没有数据。我试图在我的"柱形图"的声明中添加DataContext="{Binding}"
但没有成功。
这是我的代码摘录:
ResultView.xaml
<ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
<FrameworkElement.Resources>
<DataTemplate x:Key="graphEmptyTemlpate">
<StackPanel Width="Auto" Height="60" Orientation="Horizontal" MaxWidth="700">
<TextBlock Text="{Binding name}" VerticalAlignment="Center" TextAlignment="Center" FontSize="20" Margin="0,0,0,0" Foreground="#FF006B93"/>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="columnTemplate">
<StackPanel Background="#FFBFBFBF">
<TextBlock Text="{Binding title}"/>
<TextBlock Text="{Binding subTitle}"/>
<lvc:CartesianChart Width="400" Height="400" Series="{Binding listSeries}">
</lvc:CartesianChart>
</StackPanel>
</DataTemplate>
<local:GraphTemplateSelector
ColumnTemplate="{StaticResource columnTemplate}"
GraphEmptyTemplate="{StaticResource graphEmptyTemlpate}"
x:Key="graphTemplateSelector" />
</FrameworkElement.Resources>
<StackPanel Orientation="Horizontal" >
<ItemsControl ItemsSource="{Binding Results}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Expander Header="{Binding Title}"
IsExpanded="True"
Margin="10 10 10 10"
FontSize="20"
Foreground="White">
<ItemsControl ItemsSource="{Binding Items}"
ItemTemplateSelector="{DynamicResource graphTemplateSelector}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Margin="10 10 10 10" Orientation="Vertical"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</Expander>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel>
</ScrollViewer>
我的 ViewModel 类的构造函数位于 ResultViewModel 中.cs在 xaml 中,结果对应于 c# 中的结果,项对应于 RpAgitation。c# 中的项
public ResultsViewModel()
{
instance = this;
this.Results = new ObservableCollection<ResultParts>();
this.RpAgitation = new ResultParts("Results of the Agitation part");
ColumnGraph gr = new ColumnGraph();
RpAgitation.Items.Add(gr);
this.Results.Add(_rpAgitation);
}
以及柱图.cs
public class ColumnGraph : IGraph
{
public SeriesCollection listSeries { get; set; }
public ColumnGraph()
{
listSeries = new SeriesCollection
{
new LineSeries
{
Title = "Series 1",
Values = new ChartValues<double> { 4,7,8,9,5,4,2}
}
};
}
}
感谢您的帮助,
目前 SeriesCollection 类不是 WPF UiFramework 元素,我真的不想这样做,但我想我们不需要这样做来避免这个问题。
我不确定这是WPF的错误,还是我们做错了。
无论如何,我将进一步调查,现在另一种方法是尝试以下语法:
DataSource = new List<ChartValues<double>>
{
new ChartValues<double> {r.Next(0, 10), r.Next(0, 10), r.Next(0, 10)},
new ChartValues<double> {r.Next(0, 10), r.Next(0, 10), r.Next(0, 10)},
new ChartValues<double> {r.Next(0, 10), r.Next(0, 10), r.Next(0, 10)}
};
DataContext = this;
和 XAML
<ItemsControl ItemsSource="{Binding DataSource}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<lvc:CartesianChart Height="400">
<lvc:CartesianChart.Series>
<lvc:LineSeries Values="{Binding}"></lvc:LineSeries>
</lvc:CartesianChart.Series>
</lvc:CartesianChart>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>