使用WPF chart ToolKit基于所选的组合框创建图表

本文关键字：组合 创建 于所选 WPF chart ToolKit 使用 | 更新日期: 2023-09-27 18:07:10

我有一个不同项目的组合框。根据这个组合框的值，我想要不同的小时，已注册在这个项目在图表中显示。

我创建的图表代码:

                    <chartingToolkit:Chart Height="262" HorizontalAlignment="Left" 
                    Margin="33,0,0,620" Name="columnChart"
                    VerticalAlignment="Bottom" Width="360" BorderBrush="AntiqueWhite" BorderThickness="1">
                    <chartingToolkit:ColumnSeries 
                        DependentValuePath="Value" 
                        IndependentValuePath="Key" 
                        ItemsSource="{Binding}"/>
                </chartingToolkit:Chart>

"应该"填充创建图形的列表的代码:

private void showColumnChart()
    {
        List<KeyValuePair<string, int>> valueList = new List<KeyValuePair<string,int();
        List<ProsjektTime> timeListe = new List<ProsjektTime>();
        foreach (ProsjektTime p in Master.getDC().ProsjektTimes)
        {
            if (p.ProsjektID_FK == prosjekt.ProsjektID)
            {
                timeListe.Add(p);
            }
        }
        foreach(ProsjektTime p in timeListe)
        {
            valueList.Add(new KeyValuePair<string,int(p.TimeTyper.Type,p.AntallTimer));
        }
        try
        {
            columnChart.DataContext = valueList; 
        }
        catch (InvalidOperationException e) { MessageBox.Show(e+""); }
    }

不幸的是，我得到了错误，"无法修改此节点的逻辑子节点，因为树遍历"。

然而，我发现了一些有趣的事情。如果我将ComboBox的selectedIndex设置为一个在其上注册了一些小时的项目(并不是所有项目都在其上注册了小时)，那么一切都很好。有小时数的项目会显示在图表中，没有小时数的项目也会显示为空图表。我错过了什么?

使用WPF chart ToolKit基于所选的组合框创建图表

找到答案了。我没有使用一个dataSourceList和一个chartingToolkit:ColumnSeries，而是创建了两个列表和两个chartingToolkit:ColumnSeries。下面是代码:

        private void prosjektTimeGraf()
    {
        int estimerteTimer = 0;
        int registrerteTimer = 0;
        List<KeyValuePair<string, int>> estimerListe = new List<KeyValuePair<string, int>>();
        List<KeyValuePair<string, int>> registrertListe = new List<KeyValuePair<string, int>>();
        foreach (ProsjektTime p in Master.getDC().ProsjektTimes)
        {
            if (p.ProsjektID_FK == prosjekt.ProsjektID)
            {
                estimerteTimer += p.AntallTimer;
                estimerListe.Add(new KeyValuePair<string, int>(p.TimeTyper.Type, p.AntallTimer));
            }
        }
        foreach (ProsjektTimeBruker ptb in Master.getDC().ProsjektTimeBrukers)
        {
            if (ptb.ProsjektID_FK == prosjekt.ProsjektID)
            {
                registrerteTimer += (int)ptb.AntallTimer;
                registrertListe.Add(new KeyValuePair<string, int>(ptb.TimeTyper.Type, (int)ptb.AntallTimer));
            }
        }
        estimerListe.Insert(0, new KeyValuePair<string, int>("Totalt", estimerteTimer));
        registrertListe.Insert(0, new KeyValuePair<string, int>("Totalt", registrerteTimer));
        try
        {
            espTimer.DataContext = estimerListe;
            regpTimer.DataContext = registrertListe;
        }
        catch (InvalidOperationException e) { MessageBox.Show(e+""); }
    }
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