[英]Pie chart not displayed WPF
我使用livechart來創建一個餅圖,但每當我運行程序時,都無法看到圖表( http://imgur.com/GWecwgD ),但是當我編輯代碼時我可以看到圖表。 ( http://imgur.com/zVvkK3v )
這是我的WPF代碼:
<lvc:PieChart Series="{Binding seriesCollection}" Height="150" InnerRadius="100" LegendLocation="Bottom" DataClick="Chart_OnDataClick" Hoverable="True">
<lvc:PieChart.ChartLegend>
<lvc:DefaultLegend BulletSize="20"></lvc:DefaultLegend>
</lvc:PieChart.ChartLegend>
<lvc:PieChart.DataTooltip>
<lvc:DefaultTooltip BulletSize="20"></lvc:DefaultTooltip>
</lvc:PieChart.DataTooltip>
</lvc:PieChart>
這是我的c#代碼:
public Overview()
{
InitializeComponent();
NorthwindEntities db = new NorthwindEntities();
var data = (from d in db.Sales_by_Categories group d by d.CategoryName into grouped select new { Key = grouped.Key, Sum = grouped.Sum(e => (double)e.ProductSales) });
IEnumerable<Categorysales> datas = from c in data.AsEnumerable() select new Categorysales(c.Key, c.Sum);
seriesCollection = new SeriesCollection();
foreach (var item in datas)
{
seriesCollection.Add(new PieSeries { Title = item.Categoryname, Values = new ChartValues<ObservableValue> { new ObservableValue(item.Categorysum) }, DataLabels = true});//, LabelPoint = PointLabel
}
/* PointLabel = chartPoint =>
string.Format("{0} ({1:P})", chartPoint.Y, chartPoint.Participation);*/
// DataContext = this;
}
public SeriesCollection seriesCollection { get; set; }
public Func<ChartPoint, string> PointLabel { get; set; }
private void Chart_OnDataClick(object sender, ChartPoint chartpoint)
{
var chart = (LiveCharts.Wpf.PieChart)chartpoint.ChartView;
//clear selected slice.
foreach (PieSeries series in chart.Series)
series.PushOut = 0;
var selectedSeries = (PieSeries)chartpoint.SeriesView;
selectedSeries.PushOut = 8;
}
這是在Window還是UserControl中?
如果是窗口,請將綁定更改為:
<lvc:PieChart
Series="{Binding seriesCollection, RelativeSource={RelativeSource AncestorType=Window}}"
如果它是UserControl,您知道這是怎么回事:
<lvc:PieChart
Series="{Binding seriesCollection, RelativeSource={RelativeSource AncestorType=UserControl}}"
DataContext = this;
是一個壞習慣。 用UserControls開始這樣做,它打破了事情。 即使在窗口中,它也會造成不必要的混亂。
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