Negative rowIndex for a DataGridViewRow

Negative rowIndex problem for new DataGridViewRow

Brady Kelly <brady <at> CHASESOFTWARE.CO.ZA>
2008-01-27 18:00:34 GMT

I create and add a new row to an unbound DataGridView.  Then, if I try and
access an item in the Cells collection of the row, as in my commented out
code, I get an index out of range exception, rowIndex.  I'm not specifying a
row index, so I assume it is inferring it from the row object, whose
rowIndex property is -1.  However, when I access the cell through a row in
the grids Rows collection, I'm happy, as in my other code.  Can anyone
explain this behaviour?

The exception:

Specified argument was out of the range of valid values.

Parameter name: rowIndex

The code:

            ExportLineRow newRow = new ExportLineRow(); // Derived from
DataGridViewRows.

            newRow.ExportLine = newLIne;

            newRow.CreateCells(dgvLayout);

            dgvLayout.Rows.Add(newRow);

            int cx = 1;

            foreach (Column o in
newRow.ExportLine.RecordLayout.Columns.Values)

Re: Negative rowIndex problem for new DataGridViewRow

kara hewett <kara.hewett <at> GMAIL.COM>
2008-01-27 22:36:09 GMT

Hi Brady,

With the DataGridView, the rows could be accessed iteratively up to a
size of myGrid.Rows.Count

Here is a webpage with an example of how to access a row/column
reference as you describe.

http://msdn2.microsoft.com/en-us/library/system.windows.forms.datagridview.rowcount.aspx

On Jan 27, 2008 1:00 PM, Brady Kelly <brady <at> chasesoftware.co.za> wrote:
> I create and add a new row to an unbound DataGridView.  Then, if I try and
> access an item in the Cells collection of the row, as in my commented out
> code, I get an index out of range exception, rowIndex.  I'm not specifying a
> row index, so I assume it is inferring it from the row object, whose
> rowIndex property is -1.  However, when I access the cell through a row in
> the grids Rows collection, I'm happy, as in my other code.  Can anyone
> explain this behaviour?
>
>
>
> The exception:
>
>
>
> Specified argument was out of the range of valid values.
>
> Parameter name: rowIndex
>
>

Re: Negative rowIndex problem for new DataGridViewRow

Brady Kelly <brady <at> CHASESOFTWARE.CO.ZA>
2008-01-27 23:06:58 GMT

Hi Kara,

Thanks for the link, but I've determined my problem is somehow related to me
trying to add row objects derived from DataGridViewRow.  I suspect I'm not
overriding a required member somewhere, because I can add one custom row,
but all other rows after that break when I add them.

>
> Hi Brady,
>
> With the DataGridView, the rows could be accessed iteratively up to a
> size of myGrid.Rows.Count
>
>
> Here is a webpage with an example of how to access a row/column
> reference as you describe.
>
> http://msdn2.microsoft.com/en-
> us/library/system.windows.forms.datagridview.rowcount.aspx

Re: Negative rowIndex problem for new DataGridViewRow

kara hewett <kara.hewett <at> GMAIL.COM>
2008-01-27 22:55:58 GMT

Brady

DId that work?  If not, could you zip up the part of your code with
the data grid view and email it to my email address

kara.hewett <at> gmail.com

I'll debug the code to see what's going on.

kara

On Jan 27, 2008 1:00 PM, Brady Kelly <brady <at> chasesoftware.co.za> wrote:
> I create and add a new row to an unbound DataGridView.  Then, if I try and
> access an item in the Cells collection of the row, as in my commented out
> code, I get an index out of range exception, rowIndex.  I'm not specifying a
> row index, so I assume it is inferring it from the row object, whose
> rowIndex property is -1.  However, when I access the cell through a row in
> the grids Rows collection, I'm happy, as in my other code.  Can anyone
> explain this behaviour?
>
>
>
> The exception:
>
>
>
> Specified argument was out of the range of valid values.
>
> Parameter name: rowIndex
>