DrillDown Help

[IT]

Hi,

I'm trying to get a Drilldown working on WinForms with VB. I've customised it as needed, however I'm getting an error when trying to DrillDown as below:

Unable to cash object of type 'System.Data.DataRowView' to type "TestApp.DrillDownDataInfo'

I've looked at the guide here - http://docs.telerik.com/devtools/winforms/chartview/features/drill-down

However I do not seem to have a access to the sample files:

SamplesCS.ChartView.Features.DJIAD.csv

SamplesCS.ChartView.Features.DJIAM.csv

SamplesCS.ChartView.Features.DJIA.csv

So I haven't been able to look at it properly. Any help on this would be much appreciated or even a working demo in VB?

Thanks in advance.

[Dess | Tech Support Engineer, Principal]

Hello Shane,

Thank you for writing. 

You can find a complete C#/VB example in our Demo application >> ChartView >> Drill-down example. The demo solution is located in the installation folder which is usually located at the following path: C:\Program Files (x86)\Telerik\UI for WinForms Q2 2016\Examples\QuickStart\Bin

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Telerik by Progress

[IT]

Ok,

 

I've got the demo working, but I now need to make it work with 3 binding sources from a database rather than the CSV files and can't get it to work. I've got my binding sources working and it shows the first/second/third charts correctly, but it is showing all data as I can't figure out how to pass the value that is clicked on the chart to filter the second binding source.

Thanks

[Dess | Tech Support Engineer, Principal]

Hello Shane, 

Thank you for writing back. 

In the RadChartView.Drill event you have access to the clicked point by accessing the DrillEventArgs.SelectedPoint property:

((CategoricalDataPoint)e.SelectedPoint).Category

I hope this information helps. If you have any additional questions, please let me know.

Regards,
Dess
Telerik by Progress

[IT]

Sorry, how would I use that - if I try and use that to get a variable I just get the error "CategoricalDataPoint" is a class type and cannot be used as an express?

[IT]

Ignore that - it's too early. I hadn't realised it was C that you had posted it in and just copied and pasted. All sorted now.

For reference for anyone else, in VB it is

DirectCast(e.SelectedPoint, CategoricalDataPoint).Category

[Dess | Tech Support Engineer, Principal]

Hello Shane, 

Thank you for writing back. 

Feel free to use our online Code Converter to convert C# to VB.Net and vice versa: http://converter.telerik.com/

I hope this information helps. If you have any additional questions, please let me know.

Regards,
Dess
Telerik by Progress