我有MVVM silverlight应用程序和工具包图表。在视图模型中,我创建了ObservableCollection属性:
private ObservableCollection<LineSeries> _lines = new ObservableCollection<LineSeries>();
public ObservableCollection<LineSeries> Lines
{
get { return _lines; }
set
{
_lines = value;
NotifyPropertyChanged("Lines");
}
}
然后,在某种方法中,我用动态计数行填充这个集合:
List<SolidColorBrush> colors = BS2ColorSetHelper.GetSetColors();
for (int i = 0; i < remainderData.Count; i++)
{
LineSeries line = (colors.ElementAtOrDefault(i) != null)
? CreateNewLineSeriesWithColor(remainderData[i].DenominationName, remainderData[i].Coords, colors[i])
: CreateNewLineSeries(remainderData[i].DenominationName, remainderData[i].Coords);
line.Name = remainderData[i].DenominationName;
Lines.Add(line);
}
.........
现在我想将这个ObservableCollection绑定到工具箱图表系列。
<toolkit:Chart Name="chart">
<toolkit:Chart.Series>
????
</toolkit:Chart.Series>
</toolkit:Chart>
我试过
系列=";{绑定路径=行}"
但它不起作用。Visual Studio显示错误:"System.Windows.Data.Binding"类型的对象无法转换为"System.Collections.ObjectModel.Collection`1[System.Windows.Controls.DataVisuali"类型化。Charting.ISeries]'。我认为这是因为Series不是依赖属性。
好的,我们不能将LineSeries绑定到Series,因为Series不是Dependency属性。因此,我们可以使用以下依赖属性创建新的UserControl:
public class MultiChart : Chart
{
public IEnumerable SeriesSource
{
get
{
return (IEnumerable)GetValue(SeriesSourceProperty);
}
set
{
SetValue(SeriesSourceProperty, value);
}
}
public static readonly DependencyProperty SeriesSourceProperty = DependencyProperty.Register(
name: "SeriesSource",
propertyType: typeof(IEnumerable),
ownerType: typeof(MultiChart),
typeMetadata: new PropertyMetadata(
defaultValue: default(IEnumerable),
propertyChangedCallback: new PropertyChangedCallback(OnSeriesSourceChanged)
)
);
private static void OnSeriesSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IEnumerable newValue = (IEnumerable)e.NewValue;
MultiChart source = (MultiChart)d;
source.Series.Clear();
foreach (LineSeries item in newValue)
{
source.Series.Add(item);
}
}
}
然后我们只需将LineSeries绑定到新创建的属性:
<common:MultiChart Name="chart"
Title="{Binding Path=Title}"
SeriesSource="{Binding Path=Lines}" />
视图模型为:
public class ChartDenominationViewModel : ViewModel
{
private string _title;
public string Title
{
get { return _title; }
set
{
_title = value;
NotifyPropertyChanged("Title");
}
}
private ObservableCollection<LineSeries> _lines = new ObservableCollection<LineSeries>();
public ObservableCollection<LineSeries> Lines
{
get { return _lines; }
set
{
_lines = value;
NotifyPropertyChanged("Lines");
}
}
}
我不完全了解控件Chart
的信息。我建议您查看控件创建者提供的文档,以了解可绑定属性的名称。
但从你发布的内容来看,我的猜测是尝试:
<toolkit:Chart Name="chart" Series={Binding Lines}/>
猜测您的数据内容已全部就绪。意味着页面的数据上下文设置为您的视图模型