Question

很抱歉，如果这是一个新手问题，但是，我...我已经尝试了2天了，在网上搜索并询问周围，没有人可以帮助我，所以任何见解都会不胜感激...

我基本上需要做的是在打开上下文菜单之前用rightclick选择图表系列（ColumnSeries或LineSeries）数据点。当我处理menuItemClick事件时，我需要数据点的x轴的值。理想情况下，我希望能够在rightclick和leftclick上提升SelectionChanged事件，但还没有找到任何方法。我已经尝试了一些替代方案，但仍然遇到了死胡同。这个解决方案似乎做了我想要的LineSeries：Select the nearest point in a Silverlight Toolkit chart，但我的系列中有90％是ColumnSeries而没有serie.Points属性所以我再次陷入困境......

Answer 1

最后我使用了这个解决方案：http://www.c-sharpcorner.com/uploadfile/baimey/silverlight-charts-coordinates-on-mousemove/

我想我最好发布它以防万一其他人需要这个。

    private void Chart_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
    {
        Series serie = sender as Series;
        DateTime xAxisValue;
        Point p = e.GetPosition(serie);
        ICategoryAxis xAxis = (CategoryAxis)Chart.ActualAxes[0];
        object xHit = xAxis.GetCategoryAtPosition(new UnitValue(p.X, Unit.Pixels));

        if (SelectedObj != null)
        {
            xAxisValue = (DateTime)new DateTimeConverter().ConvertBack(xHit as String, typeof(String), SelectedObj.DisplayFrequency, Thread.CurrentThread.CurrentUICulture);

            foreach (Frequency frequency in SelectedObj.Frequencies)
            {
                if(frequency == SelectedObj.DisplayFrequency)
                    addMenuItem(frequency, true, xAxisValue);
                else
                    addMenuItem(frequency, false, xAxisValue);
            }

            cMenu.IsOpen = true;
            cMenu.HorizontalOffset = e.GetPosition(LayoutRoot).X;
            cMenu.VerticalOffset = e.GetPosition(LayoutRoot).Y;
        }
    }

    private void addMenuItem(Frequency frequency, bool isDisplayFrequency, DateTime xAxisValue)
    {
        menuItem = new MenuItem();
        menuItem.Header = frequency;
        menuItem.Tag = xAxisValue;
        if (isDisplayFrequency)
        {
            menuItem.Icon = new TextBlock { Text = "\xfc", FontFamily = new System.Windows.Media.FontFamily("Wingdings"), FontWeight = FontWeights.Bold, TextAlignment = TextAlignment.Center };
            menuItem.FontWeight = FontWeights.Bold;
        }
        cMenu.Items.Add(menuItem);
        menuItem.Click += new RoutedEventHandler(menuItem_Click);
    }

    void menuItem_Click(object sender, RoutedEventArgs e)
    {
        MenuItem item = sender as MenuItem;
        Frequency itemFreq = (Frequency)item.Header;
        DateTime xAxisValue = (DateTime)item.Tag;

        ...

        cMenu.IsOpen = false;
    }

Silverlight Toolkit：右键单击并左键单击选择图表系列数据项

1 个答案: