更新和刷新wpf图表 [英] Update and refresh wpf chart

问题描述

我正在使用wpf工具包图表，我无法查看插入的图表数据...这是xaml部分：

I'm working with chart of wpf toolkit, and I can't view the inserted data of the chart... Here is the xaml part:

<chartingToolkit:Chart  Height="352" HorizontalAlignment="Left" Name="profilo_cale_chart" Title="Profili cale" VerticalAlignment="Bottom" Width="655" FontSize="16" Margin="252,0,0,55" Visibility="Hidden"> 
   <chartingToolkit:AreaSeries DependentValuePath="Value" IndependentValuePath="Key" IsSelectionEnabled="True" ItemsSource="{Binding}" Foreground="#FF242424" Background="LightSteelBlue" />
</chartingToolkit:Chart>

和cs：
声明

And the cs: Declaration

public partial class MainWindow : Window
{ ...  
    List<KeyValuePair<DateTime, double>> valueList = new List<KeyValuePair<DateTime, double>>(); 
...

当用户选择两个dateTime并按下按钮时调用模块

Module called when a user chose two dateTime and press a button

private void refresh_charts(DateTime dtStart, DateTime dtEnd)
{
    valueList.Clear();
    using (ModelFoosContainer mc1 = new ModelFoosContainer())
    {
        var res_mea = (from mea in mc1.MeasureSet where (mea.datetime>= dtStart && mea.datetime <= dtEnd) orderby mea.datetime descending select mea).Take(1000);
        foreach (Measure mea1 in res_mea){
            valueList.Add(new KeyValuePair<DateTime,double>(mea1.datetime, Convert.ToDouble(mea1.depth)));
        }
    }


    profilo_cale_chart.DataContext = valueList;
    //I've tried with this two but doesn't work..
    //profilo_cale_chart.Refresh();
    //this.UpdateLayout();

}

此后，图表具有正确且不为空的DataContext，没有显示值...任何人都知道如何解决它？

After this the chart has the right and not empty DataContext but doesn't show the values... anyone knows how can I fix it?

推荐答案

尝试为图表系列设置名称：

Try to set name for chart series:

<chartingToolkit:AreaSeries Name="Example" DependentValuePath="Value" IndependentValuePath="Key" IsSelectionEnabled="True" ItemsSource="{Binding}" Foreground="#FF242424" Background="LightSteelBlue" />

，然后为AreaSeries设置DataContext：

and after that, set DataContext for AreaSeries:

Example.DataContext = valueList;

这篇关于更新和刷新wpf图表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！