Microsoft System.Web.UI.DataVisualization.Charting.Chart

Question

I am plotting a Microsoft System.Web.UI.DataVisualization.Charting.Chart with three series (two columns and an overlaying line). It appears that the y axis upper bound is auto calculated based on the data range in the first series added to the chart. Subsequently any series does not get rendered when its y value is greater than the first series y value. In this instance I would like it to use the maximum value from any series.

The series are added to the chart via a generic method:

foreach (var s in model.Series)
            {
                var chartSeries = new Series(s.Title);

                chartSeries.ChartType = s.Type;
                chartSeries.Color = s.DrawColour;

                // add the data to the series
                foreach (DataRow row in data.Tables[0].Rows)
                {
                    chartSeries.Points.AddXY(row[model.XAxis.DataColumnName], row[s.ColumnName]);
                }
                // does the series name come from a column? if not use the plain text. if the column has a caption use it, otherwise the column name.
                chartSeries.Name = data.Tables[0].Columns.Contains(s.Title) ? String.IsNullOrEmpty(data.Tables[0].Columns[s.Title].Caption) ? data.Tables[0].Columns[s.Title].Caption : data.Tables[0].Columns[s.Title].ColumnName : s.Title;

                chart.Series.Add(chartSeries);
            }

If I reverse the order the series are added to the chart then the plot area is correct, however the line series sits behind the columns.

Any ideas? Thanks.

Answer 1

I'm assuming you have a single chart area that you are adding the series' to? If so, you can modify the maximum value of the Y axis that belongs to that chart area. It would be something like this:

// put this block above your foreach loop
double maxval = 100; // <-- put your maximum value here.
chart.ChartAreas[0].AxisY.Maximum = maxval;

Using LINQ, you can easily find the maximum value inside all of your series then set that discovered max value as the AxisY.Maximum.