Subreports with ObjectDataSource

[John]

Hi,
I am using Reporting Q1 2011 and am trying to make a report that contains a subreport. I am using a ObjectDataSource for this report. I am not setting the datasource for the subreport, I am using the NeedDataSource event to do that. Problem is, I can't figure out how to refer to the element I need. I downloaded an example from this site http://www.telerik.com/community/forums/reporting/telerik-reporting/sample-for-master-detail-using-object-collection-as-datasource.aspx that shows how to do this, but it's from an older version and the .DataItem property is no longer available. I can't seem to find a current example of how to do this. So how exactly does one gain access to dataitems in a business object so that the datasource of the subreport can be set correctly using Q1 2011?

Thanks

[Tavo]

hi there, i hope still you're needing it, the code need some changes on the types, instead use Telerik.Reporting.Processing.SubReport try using Telerik.Reporting.Processing.ReportItemBase in the same event. i mean:

        private void subReport_NeedDataSource(object sender, EventArgs e)
        {
            Telerik.Reporting.Processing.ReportItemBase subReportItem = sender as Telerik.Reporting.Processing.ReportItemBase;
            // get the current row of data
            subReportItem.ItemDefinition.Report.DataSource = yourCollention;
         }

[John]

Hi Tavo,
 Thanks for your input, but It's still not clear at all how to link the datasource to an element in the parent datasource. My business object is as such:
    internal class CompanyData
    {
        public IList<DepartementData> departments;
        public CompanyData(string name, string address)
        {
            CompanyName = name;
        }

        public string CompanyName { get; set; }
        public IList<DepartementData> Departments
        {
            get { return departments; }
        }
    }

    internal class Companies : List<CompanyData>
    {
        public Companies()
        {
            CompanyData cd;
            cd = new CompanyData("A");
            cd.departments = new Departements();
            Add(cd);
            cd = new CompanyData("B");
            cd.departments = new Departements();
            Add(cd);
        }
    }

    // Departments
    internal class DepartementData
    {
        public DepartementData(string name)
        {
            DepartementName = name;
        }
        public string DepartementName { get; set; }
    }

    internal class Departements : List<DepartementData>
    {
        public Departements()
        {
            DepartementData d;
            d = new DepartementData("Team1");
            Add(d);
            d = new DepartementData("Team2");
            Add(d);
        }
    }

My main report has it's datasource pointing to the CompanyData object. The subreport will have to have it's datasource pointing to the CompanyData.Departments IList. In the subReport_NeedDataSource event I have to assign the datasource to this CompanyData.Departments that is currently being used by the parent report. You say use 'yourcollection'. OK, but how do I reference my collection when this event is called? I assume that I have to reference the datasource of the main report and then point to the Departments collection of that, but where is it?

Now I'm totally confused!?!

[Tavo]

hi John , well first you must to associate your main report to a viwer, using this inside the function that you used to call the main report:
(This code is using on the call to the main report)
        YourMainReport mainReport = new YourMainReport ();

        mainReport.DataSource = objectCompanyData;

        mainReport.lisOfDepartaments = objectCompanyData.Departaments;

        this.ReportViewer.Report = reporteMostrar;

additional to this i'm suggest to add a public property to your main report the type Ilist<Departament> to make easier
the spread from the list coming from the main call (this line: mainReport.lisOfDepartaments = listofDepartaments;)

you must to add to the object subreport the event NeedDataSource the next code:
(This code is using at the main report)

     public Ilist<Departament> lisOfDepartaments;
       private void subReportInsideMainReport_NeedDataSource(object sender, EventArgs e)
        {
            Telerik.Reporting.Processing.ReportItemBase subReportItem = sender as Telerik.Reporting.Processing.ReportItemBase;
            // get the current row of data
            subReportItem.ItemDefinition.Report.DataSource = lisOfDepartaments;
         }

[John]

Hi Tavo,

I was still having some difficulty following your logic. In the mean time, I opened a support ticket on the same issue. The answer is very elegant and simple.

Simply set the SubReport control binding to =Field.Departments. No events are needed (in fact, they are discouraged in this case).

That's it. Simple and it works.

Thank you for your help.

-John