chart in subreport multiple times via collection

[Robert]

It may be me, but I have a master report and in it I would like multiple sub reports that contain charts.

i created a report that works with the object model. Then I created a master repotr that contains this report (now a subreport) and sends it is List of the object model.
I do alot of settings of the chart programmatically in the detail report's "need data source" event.

However, the DataSource in the detail's "need data source" event is actually the whole collection and NOT an individual item from that collection.

I thought I had set it up in similar fashion as my grid data (does not use need data source event though), but I can't seem to figure out the trick to get it to work?

Does this make sense? Basically I a list of up to 4 objects. These objects contain info (title, points, etc.) necessary to construct a chart. I want the report to render 4 charts on my report.

any ideas?

thanks!

[Elian]

Hello Robert,

The Report_NeedDataSource will get the whole List as data object, the DetailSection_NeedDataSource will be called once for every item in the list, the Chart_NeedDataSource event will be called, again, once for every item in the list. It depends on what you want to achieve. 

If we understand correctly you want to pass a List of 4 object to the detail Report and the detail Report should create 4 charts according to the list items. If that's the case you can use the Chart_NeedDataSource event. You can get the data object like this:

private void chart1_NeedDataSource(object sender, EventArgs e)

       {

           var chart = (Telerik.Reporting.Processing.Chart)sender;

           var report = (Telerik.Reporting.Processing.DetailSection)chart.Parent;



           //this will be the current item of the list

           var data = report.DataObject;

       }

Best wishes,
Elian
the Telerik team

[Robert]

I tried what you suggested. Was not able to get it to work.
There is no DetailSection.NeedDataSource event. The Chart_NeedDataSource event fired only once.  here is my code

public ReportDataChart(MyObjectModel om)

{

_om = om;

}

private void ReportDataChart_NeedDataSource(sender, e)

{

this.DataSource = _om.DataSeriesList // collection of 4 object models)

}

private void chart1_NeedDataSource(sender, e)

{

...telerik code in here from below

}




the report needDS fires once (as expected), but the chart only fires once. i have other code in the chart_NeeDS that formats the chart...like

chart1.DataSource =  ((DataSeriesDisplayViewModel)data.RawData).SeriesPoints;
chart1.ChartTitle.TextBlock.Text = "my great title";
etc.

Any advice?

[Robert]

forgot to mention I get a report with 4 graphs, but it is only the first graph 4 times. It is not moving to the next item in the data list.
i kind of get it that once NeedDataSource is et, it no longer needs it and doesn't fire, but where does this code (chart formatting) need t ogo so that it fires 4x times, each time with an item in the colelction, and not the same item 4x?

[Robert]

i put my code in the chart1_ItemDataBinding event and i got my charts (one for each item in the collection). i believe all is well and consider this discussion complete and closed to my satisfaction.

thanks!