Home / Community & Support / Developer Productivity Tools Forums / WinForms > GridView > visible area in gridview

• yair

  Posted on Jan 29, 2012 (permalink)

  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..

  Reply

• Svett Svett

  Posted on Jan 31, 2012 (permalink)

  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

  SP1 of Q3’11 of RadControls for WinForms is available for download (see what's new).

  Reply

• yair

  Posted on Jan 31, 2012 (permalink)

  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?
  

  Reply

• Svett Svett

  Posted on Feb 2, 2012 (permalink)

  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

  SP1 of Q3’11 of RadControls for WinForms is available for download (see what's new).

  Reply

• yair

  Posted on Feb 2, 2012 (permalink)

  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"

  Reply

• Svett Svett

  Posted on Feb 6, 2012 (permalink)

  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

  SP1 of Q3’11 of RadControls for WinForms is available for download (see what's new).

  Reply

• yair

  Posted on Feb 7, 2012 (permalink)

  thanks Svett!!! it's perfect! :-) 

  Reply

Back to Top

Home / Community & Support / Developer Productivity Tools Forums / WinForms > GridView > visible area in gridview