我正在使用WPF Live Charts库。我正在尝试一般地创建条形图。
以下是我的代码。由于它不支持泛型,因此无法在XAML中实现。
public abstract class AbstractGenericBarChart<T> : UserControl, INotifyPropertyChanged
{
SeriesCollection _SeriesCollection;
public SeriesCollection SeriesCollection { get { return _SeriesCollection; } set { _SeriesCollection = value; notifyPropertyChanged("SeriesCollection"); } }
string[] _Labels;
public string[] Labels { get { return _Labels; } set { _Labels = value; notifyPropertyChanged("Labels"); } }
Func<int, string> _Formatter;
public Func<int, string> Formatter { get { return _Formatter; } set { _Formatter = value; notifyPropertyChanged("Formatter"); } }
public abstract void constructChart(List<T> chartItems);
public void init(string xLabel, string yLabel)
{
renderChart(xLabel, yLabel);
}
public void renderChart(string xLabel, string yLabel)
{
CartesianChart chart = new CartesianChart { Margin = new Thickness(10, 10, 10, 10), LegendLocation = LegendLocation.Bottom, DataTooltip = new DefaultTooltip { SelectionMode = TooltipSelectionMode.SharedYValues } };
Axis xAxis = new Axis { Foreground = Brushes.Black, FontSize = 14d, Title = xLabel };
Axis yAxis = new Axis { Foreground = Brushes.Black, FontSize = 14d, Title = yLabel };
chart.AxisX.Add(xAxis);
chart.AxisY.Add(yAxis);
setBinding("LabelFormatter", Formatter, xAxis, Axis.LabelFormatterProperty);
setBinding("Labels", Labels, yAxis, Axis.LabelsProperty);
setBinding("Series", SeriesCollection, chart, CartesianChart.SeriesProperty);
Content = chart;
}
public void setBinding(string propertyName, object source, FrameworkElement control, DependencyProperty dependencyProperty)
{
Binding binding = new Binding(propertyName)
{
Source = source
};
control.SetBinding(dependencyProperty, binding);
}
public event PropertyChangedEventHandler PropertyChanged;
protected void notifyPropertyChanged(string prop)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(prop));
}
}
internal class BarChart : AbstractGenericBarChart<TopTransactingCount>
{
public override void constructChart(List<TopTransactingCount> chartItems)
{
SeriesCollection = new SeriesCollection
{
new RowSeries
{
Title = "Transaction Count",
Values = new ChartValues<long>(chartItems.Select(x=>x.TransCount))
}
};
Labels = chartItems.Select(x => x.Date.ToShortDateString()).ToArray();
Formatter = value => value.ToString();
DataContext = this;
}
}
在启动时,我看到一个预期的空图表控件。
我在提交按钮单击时调用constructChart方法。
public partial class TotalTransCountsChart : UserControl, IChart
{
private BarChart chart = new BarChart();
List<object> chartData;
public TotalTransCountsChart()
{
InitializeComponent();
}
public void init(List<object> chartData)
{
this.chartData = chartData;
chart.init("Transaction Count", "Date");
chart.constructChart(chartData.Cast<TopTransactingCount>().ToList());
grid.Children.Add(chart);
Grid.SetRow(chart, 3);
}
private void CmdSubmit_Click(object sender, System.Windows.RoutedEventArgs e)
{
chart.constructChart(chartData.Cast<TopTransactingCount>().ToList());
}
}
但是,该图表仍然为空。我认为代码中的
binding part
无法正常工作。我被困在这一点上。 最佳答案
看起来您在错误地创建了绑定(bind)(尝试从Visual Studio输出窗口中确认它-报告有关错误绑定(bind)的消息)。
例如:
setBinding("Labels", Labels, yAxis, Axis.LabelsProperty);
public void setBinding(string propertyName, object source, FrameworkElement control, DependencyProperty dependencyProperty)
{
Binding binding = new Binding(propertyName)
{
Source = source
};
control.SetBinding(dependencyProperty, binding);
}
Labels是一个
string[]
,并且您有一个binding,它尝试使用“Labels”属性-该属性不存在。您需要一个有效的绑定(bind)源,很可能是DataContext:
setBinding("LabelFormatter", DataContext, xAxis, Axis.LabelFormatterProperty);
setBinding("Labels", DataContext, yAxis, Axis.LabelsProperty);
setBinding("Series", DataContext, chart, CartesianChart.SeriesProperty);
或更好的是-不要指定源,并且所有绑定(bind)都将连接到当前DataContext,即使它更新了:
public void setBinding(string propertyName, object source, FrameworkElement control, DependencyProperty dependencyProperty)
{
Binding binding = new Binding(propertyName);
control.SetBinding(dependencyProperty, binding);
}
关于c# - C#WPF实时图表-一般创建图表,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/58876562/