private void DataBindChart(UI.DataVisualization.Charting.Chart chart)
{
// NOTE: WebForms chart will throw null refs if optional values are set to null
if (_dataSource != null)
{
if (!String.IsNullOrEmpty(_dataSource.GroupByField))
{
chart.DataBindCrossTable(
_dataSource.DataSource,
_dataSource.GroupByField,
_dataSource.XField ?? String.Empty,
_dataSource.YFields,
_dataSource.OtherFields ?? String.Empty,
_dataSource.PointSortOrder);
}
else if (_dataSource.DataBindTable)
{
chart.DataBindTable(
_dataSource.DataSource,
_dataSource.XField ?? String.Empty);
}
else
{
Debug.Assert(false, "Chart.DataBind was removed - should not reach here");
//chart.DataSource = _dataSource.DataSource;
//chart.DataBind();
}
}
}
private static void LoadChartThemeFromFile(
UI.DataVisualization.Charting.Chart chart,
Stream templateStream
)
{
// workarounds for Chart templating bugs mentioned in:
// http://social.msdn.microsoft.com/Forums/en-US/MSWinWebChart/thread/b50d5b7e-30e2-4948-af7a-370d9be1268a
chart.Serializer.Content = SerializationContents.All;
chart.Serializer.SerializableContent = String.Empty; // deserialize all content
chart.Serializer.IsTemplateMode = true;
chart.Serializer.IsResetWhenLoading = false;
// loading serializer with stream to avoid bug with template file getting locked in VS
// The default xml reader used by the serializer does not ignore comments
// Using the IsUnknownAttributeIgnored fixes this, but then it would give no feedback to the user
// if member names do not match the spelling and casing of Chart properties.
XmlReader reader = XmlReader.Create(
templateStream,
new XmlReaderSettings {
IgnoreComments = true
}
);
chart.Serializer.Load(reader);
}
private void ApplySeries(UI.DataVisualization.Charting.Chart chart)
{
foreach (var seriesData in _series)
{
var series = new Series();
try
{
series.AxisLabel = seriesData.AxisLabel ?? String.Empty;
series.ChartArea = seriesData.ChartArea ?? String.Empty;
series.ChartType = seriesData.ChartType;
series.Legend = seriesData.Legend ?? String.Empty;
series.MarkerStep = seriesData.MarkerStep;
series.Name = seriesData.Name ?? String.Empty;
// data-bind the series (todo - support o.Points.DataBind())
if (seriesData.DataSource != null)
{
if (String.IsNullOrEmpty(seriesData.DataSource.YFields))
{
var yValues = seriesData.DataSource.DataSource;
var yValuesArray = yValues as IEnumerable[];
if ((yValuesArray != null) && !(yValues is string[]))
{
series.Points.DataBindXY(
seriesData.DataSource.XDataSource,
yValuesArray
);
}
else
{
series.Points.DataBindXY(
seriesData.DataSource.XDataSource,
yValues
);
}
}
else
{
series.Points.DataBindXY(
seriesData.DataSource.XDataSource,
seriesData.DataSource.XField,
seriesData.DataSource.DataSource,
seriesData.DataSource.YFields
);
}
}
}
catch (Exception)
{
// see notes above
series.Dispose();
throw;
}
chart.Series.Add(series);
}
}
// Notes on ApplyXXX methods:
// Chart elements should be configured before they are added to the chart, otherwise there
// will be some rendering problems.
// We must catch all exceptions when configuring chart elements and dispose of them manually
// if they have not been added to the chart yet, otherwise FxCop will complain.
private void ApplyChartArea(UI.DataVisualization.Charting.Chart chart)
{
ChartArea chartArea = new ChartArea("Default");
try
{
ApplyAxis(chartArea.AxisX, _xAxis);
ApplyAxis(chartArea.AxisY, _yAxis);
chart.ChartAreas.Add(chartArea);
}
catch
{
// This is to appease FxCop
chartArea.Dispose();
throw;
}
}
private void ApplyTitles(UI.DataVisualization.Charting.Chart chart)
{
foreach (var titleData in _titles)
{
var title = new Title();
try
{
title.Name = titleData.Name;
title.Text = titleData.Text;
}
catch (Exception)
{
// see notes above
title.Dispose();
throw;
}
chart.Titles.Add(title);
}
}
private void ApplyLegends(UI.DataVisualization.Charting.Chart chart)
{
foreach (var legendData in _legends)
{
var legend = new Legend();
try
{
legend.Name = legendData.Name ?? String.Empty;
legend.Title = legendData.Title ?? String.Empty;
}
catch (Exception)
{
// see notes above
legend.Dispose();
throw;
}
chart.Legends.Add(legend);
}
}
// create and execute an action against the WebForm control in a limited scope since the control is disposable.
internal void ExecuteChartAction(Action <UI.DataVisualization.Charting.Chart> action)
{
using (UI.DataVisualization.Charting.Chart chart = new UI.DataVisualization.Charting.Chart())
{
chart.Width = new Unit(_width);
chart.Height = new Unit(_height);
ApplyChartArea(chart);
ApplyLegends(chart);
ApplySeries(chart);
ApplyTitles(chart);
DataBindChart(chart);
// load the template last so that it can be applied to all the chart elements
LoadThemes(chart);
action(chart);
}
}
private void LoadThemes(UI.DataVisualization.Charting.Chart chart)
{
if (!String.IsNullOrEmpty(_theme))
{
using (MemoryStream memoryStream = new MemoryStream())
{
byte[] themeContent = Encoding.UTF8.GetBytes(_theme);
memoryStream.Write(themeContent, 0, themeContent.Length);
memoryStream.Seek(0, SeekOrigin.Begin);
LoadChartThemeFromFile(chart, memoryStream);
}
}
if (!String.IsNullOrEmpty(_themePath))
{
using (Stream stream = _virtualPathProvider.GetFile(_themePath).Open())
{
LoadChartThemeFromFile(chart, stream);
}
}
}
