Codejock Developer Community : Report Controls Selected Rows in c#

Report Controls Selected Rows in c# : Thanks for the reply, i realised...

Fri, 28 Jan 2005 06:39:20 +0000

Author: amorton
Subject: 1712
Posted: 28 January 2005 at 6:39am

Thanks for the reply, i realised that was a option but i wanted to tryand avoid it if possible. After all there is a COM enumeratoravailable, so i worked out how to get to it. It goes something likethis...

The definition of the IReportSelectedRows interface (from ole view) isa dispactch interface and there is no definition of the _NewEnumproperty. However this prop is allways implemented with a dispatch IDof -4 so vb will just call Invoke on the IDispatch interface with -4 toget the enumerator for a for each loop.

The com enumerator returned implements IEnumVARIANT com interface, idid not check for any other interfaces. Which is not that different tothe IEnumerable interface in dot net.

When an active x dll is imported dot net uses AxImp.exe to makethe active X host sub class, it is an object of this class thatrepresents the control on the page. This utility can export the sourceit creates for the ax host sub class.

So i used AxHost to make a c# class that hosts the report control. Ithen added a function to the report control in dot net calledSelectedRowsEnumerator that returns a object that can be used forfor-each in c#.

This function :
1 - casts the base ocx controls selectedRows property/object to a dot net definition of the COM IDispatch interface.

2 - Calls invoke on the dispatch interface to invoke the get propertywith disp ID -4, this is the _NewEnum property. It is possible to callthings by name a little easier in dot net i think, but i was not surehow and not sure if the ocx class would implement a call by nameconsidering it was not declared in the interface.

3 - casts the result of the invoke to a dot net definition of the IEnumVARIANT interface.

4 - returns a class that implements both IEnumerable and IEnumeratorand wraps access to the com based enumerator returned in step 4 above.The IEnumerable implementation just returns itself so the object can beused in a for each statement.

So now i can write code like this in c#

foreach (XtremeReportControl.ReportRow row in report.SelectedRowsEnumerator())
{
}

I also added a property to get the first item in the collection to make things easier when there is one item selected.

hope that helps.

aaron

Report Controls Selected Rows in c# : Try the following. It will return...

Thu, 27 Jan 2005 14:31:34 +0000

Author: Boyd
Subject: 1712
Posted: 27 January 2005 at 2:31pm

Try the following. It will return an array of all the selected rows (with the option to exclude any grouped rows). This function assumes that your report control is accessible to the method through the 'reportControl' variable.

public XtremeReportControl.ReportRow[] GetSelectedRows(bool includeGroupRows)
{
    ArrayList rowsList = new ArrayList();
    for (int j = 0; j < reportControl.Rows.Count; j++)
    {
        if (reportControl.Rows[j].Selected)
        {
              if (includeGroupRow || reportControl.Rows[j].GroupRow == false)
                  rowsList.Add(reportControl.Rows[j]);
        }
    }
    XtremeReportControl.ReportRow[] rows = new XtremeReportControl.ReportRow[rowsList.Count];
    rowsList.CopyTo(rows);
    return rows;
}

I apologize if there are syntax errors... I wrote this from scratch.

Edited by Boyd

Report Controls Selected Rows in c# : Hello there, i had been using...

Thu, 27 Jan 2005 09:48:25 +0000

Author: amorton
Subject: 1712
Posted: 27 January 2005 at 9:48am

Hello there, i had been using the report control in VB and decided in see how well it would go in dot net.

In VB6 i had issues with accessing the selected rows for the report, ineeded to do a for each to get the selected row even when there wasonly one row selected as there is no Item property on the selectedRowscollection.

When i use the control in dot net things get worse. The tlb importercannot detect whatever process is used to provide enumeration in vb andso does not provide a way to get a IEnumerator for the collection. Sothere is no way to peform a foreach.

As there is no item accessor for the collection i cannot see how toaccess any of the rows int he selected rows collection. If anyoneknows how to do this could they let me know please.

thanks
aaron