visible area in gridview

[yair]

Hello..
I want to know how many rows there are in the visible area in gridview..
how can I do that?

this is for controlling load of rows.. to get better performance..
I want to load 30 rows each scrolling..

[Svett]

Hello Yair,

You can get the rows that are visible by accessing the VisualRows property of GridTableElement:

public IEnumerable<GridViewDataRowInfo> GetVisibleDataRows()
{
    foreach (GridRowElement rowElement in this.myRadGridView1.TableElement.VisualRows)
    {
        if (rowElement.RowInfo is GridViewDataRowInfo)
        {
            yield return rowElement.RowInfo as GridViewDataRowInfo;
        }
    }
}

I hope this helps.

Regards,
Svett
the Telerik team

[yair]

thanks Svett

i'm using vb.net.
I tried to convert the code to vb.net but i couldn't..
can you write it in vb.net?

[Svett]

Hi Yair,

Here is the VB.NET version of the code snippet that I have sent you previously:

Public Function GetVisibleDataRows() As IEnumerable(Of GridViewDataRowInfo)
    For Each rowElement As GridRowElement In Me.myRadGridView1.TableElement.VisualRows
        If TypeOf rowElement.RowInfo Is GridViewDataRowInfo Then
            yield Return TryCast(rowElement.RowInfo, GridViewDataRowInfo)
        End If
    Next
End Function

All the best,
Svett
the Telerik team

[yair]

it doesn't good.. I converted the c# code by Telerik converter tool too.. it doesn't work well..
the converter dosn't know how to convert the code "yield"

[Svett]

Hi Yair,

Here is a valid VB.NET version of my code snippet:

Public Function GetVisibleDataRows() As List(Of GridViewDataRowInfo)
    Dim result As New List(Of GridViewDataRowInfo)()

    For Each rowElement As GridRowElement In Me.myRadGridView1.TableElement.VisualRows
        If TypeOf rowElement.RowInfo Is GridViewDataRowInfo Then
            result.Add(TryCast(rowElement.RowInfo, GridViewDataRowInfo))
        End If
    Next

    Return result
End Function

I hope this helps.

Regards,
Svett
the Telerik team

[yair]

thanks Svett!!! it's perfect! :-)