在MS图表图例中显示值 [英] Show Values in MS Chart Legends

问题描述

我试图在WinForm上的图例中显示FastLine类型MS图表的最新系列值.图表中最多可以包含10个系列.我正在使用以下代码在图例中添加3列(符号，系列名称，值):

I am trying to show the latest series value in a Legend for a FastLine type MS chart on a WinForm. I can have up to 10 series in a chart. I am using following code to add 3 columns (Symbol, Series Name, Value) in the Legend:

        // Add Color column
        LegendCellColumn firstColumn = new LegendCellColumn();
        firstColumn.ColumnType = LegendCellColumnType.SeriesSymbol;
        firstColumn.HeaderBackColor = System.Drawing.Color.WhiteSmoke;
        chart1.Legends[0].CellColumns.Add(firstColumn);

        // Add Legend Text column
        LegendCellColumn secondColumn = new LegendCellColumn();
        secondColumn.ColumnType = LegendCellColumnType.Text;
        secondColumn.Text = "#LEGENDTEXT";
        secondColumn.HeaderBackColor = System.Drawing.Color.WhiteSmoke;
        chart1.Legends[0].CellColumns.Add(secondColumn);

        // Add Total cell column
        // I will set text for this column at runtime.
        LegendCellColumn total = new LegendCellColumn();
        total.Name = "Value";
        total.HeaderBackColor = System.Drawing.Color.WhiteSmoke;
        chart1.Legends[0].CellColumns.Add(total);

我的问题是-如何访问特定系列的图例以显示运行时值?在为系列添加新分数的同时，如果我执行--

My question is - How do I access the legend for a specific series to show the runtime values? While adding new points to the Series if I do something like -

    // Add new point to this series here
    ......
    ......
    _chart.Legends[0].CellColumns[2].Text = runtimeValue.ToString();

然后，为所有系列显示相同的值.该值是该系列之一的最新值.看起来像-

then, a same value gets shown for all the series. This value is the latest for one of the series. It looks like -

----  Series1   45.21     
----  Series2   45.21     
----  Series3   45.21     
----  Series4   45.21 

如何访问每个系列的图例，以便可以将单个值设置为显示类似-

How do I access a legend for each series so that I can set the individual value to show something like -

----  Series1   45.21 
----  Series2   100 
----  Series3   1.123
----  Series4   250.145

在这里，我看到了一些帖子中提到，他们可以按-

Here on SO, I have seen that some posts have mentioned that they can access the legend items by series such as -

myChartName.Legends["mySeriesName"] 

我得到一个无效的参数异常，如果尝试这样做，则意味着我无法通过系列名称访问图例.我在这里想念什么吗?

I get an invalid argument exception If I try to do that which meant I can't access the legend by a series name. Am I missing something here?

感谢您提供的任何帮助.

Thanks for any help offered.

推荐答案

我终于设法得到了想要的东西. Junaith指向使用CustomItem的指针是实现这一目标的关键.这是我的最终解决方案:

I finally managed to get what I was looking for. Junaith's pointer towards using CustomItem is the key thing in achieving that. Here is my final solution:

创建系列时:

LegendItem newItem = new LegendItem();
newItem.ImageStyle = LegendImageStyle.Line;
newItem.Color = lineColor;
newItem.BorderWidth = 2;
newItem.Cells.Add(LegendCellType.SeriesSymbol, "", ContentAlignment.MiddleLeft); // Symbol
newItem.Cells.Add(LegendCellType.Text, seriesName, ContentAlignment.MiddleLeft); // Series Name
newItem.Cells.Add(LegendCellType.Text, "", ContentAlignment.MiddleLeft); // Value
...
...
series.IsVisibleInLegend = false;
_chart.Series.Add(series);

添加实时XY值时:

_chart.Legends[0].CustomItems[seriesIndex].Cells[2].Text = YValue.ToString("00.00");

这给了我我想要的视图:

That gives me the view I wanted:

----  Series1   45.21 
----  Series2   100 
----  Series3   1.123
----  Series4   250.145

如果要在运行时删除任何系列，请确保使用以下方法删除相应的自定义项目:

If you are deleting any of your series at runtime, then make sure you delete the corresponding custom item using:

_chart.Legends[0].CustomItems.RemoveAt(i);

这篇关于在MS图表图例中显示值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！